Measure an economy’s output with GDP and GNI, convert nominal figures into real and per capita values, read the business cycle, and evaluate GDP as a measure of well-being.
Each is in the Economics glossary, with every other term in the subject.
The phase of the business cycle in which real GDP grows rapidly and rises above potential output, so unemployment is low and inflationary pressure builds.
The short-term fluctuations of real GDP around its long-term growth trend, through phases of expansion, peak, contraction and trough.
The error of counting the value of an intermediate good more than once, both on its own and again as part of the price of the final good.
A method of measuring national income by adding up all spending on final goods and services produced in the economy: GDP = C + I + G + (X − M).
A price index measuring the average price of all goods and services in GDP relative to a base year (= 100), used to convert nominal values into real values.
GDP adjusted for environmental costs by subtracting the estimated value of resource depletion and environmental damage caused by economic activity.
The total market value of all final goods and services produced within a country’s borders over a period of time, usually a year, whoever owns the factors of production.
The total income earned by a country’s residents over a period of time, wherever it is earned: GDP plus income earned abroad by residents minus income paid to non-residents.
Explain how the circular flow of income shows the interactions between decision-makers, with leakages and injections.
Explain why the output, income and expenditure approaches give the same value of national income.
Calculate nominal GDP using the expenditure approach and nominal GNI from national income data.
Calculate real GDP and real GNI using a price deflator, and real GDP and GNI per capita.
Distinguish between GDP and GNI, nominal and real values, and figures at market exchange rates and at purchasing power parity.
Draw and explain a business cycle diagram showing its phases and the long-term growth trend.
Evaluate GDP and GNI as measures of economic well-being, for comparisons over time and between countries.
Explain how the OECD Better Life Index, the World Happiness Report and the Happy Planet Index measure well-being differently.
Macroeconomics studies the economy as a whole, and its first task is measurement: before anyone can say whether an economy is growing, shrinking or doing well for its people, its total output and income must be counted. The tools for this are gross domestic product (GDP), gross national income (GNI) and the adjustments that turn them into comparable figures, and they underlie every other macroeconomic statistic, from growth rates to debt ratios.
Measuring output links directly to the key concepts of economic well-being and change. A rise in real GDP per capita usually means that people can consume more goods and services, but output is only one part of well-being, which also depends on how income is shared (equity), on leisure and health, and on whether growth damages the environment that future generations inherit (
139 exam-style questions on this subtopic, written in the style of the IB papers. The first has its markscheme open. Counted on
Read the extract and answer the questions that follow.
Text A — A shrinking flow of income in Tarvesh
[1] Tarvesh is a high-income economy in northern Europe with a large manufacturing sector. Around 45 % of its manufactured goods are sold to its neighbour, Holvenia.
[2] In 2025, a recession in Holvenia reduced spending on Tarvesh's exports. Exports are an injection into Tarvesh's circular flow of income, while saving, taxes and imports are leakages. At the same time, Tarvesh's households became more cautious and increased their saving. Estimates for 2025 are shown in Table 1.
[3] The finance minister has said that the government will 'not stand by while the economy shrinks', but has not yet announced any measures.
Table 1: Leakages and injections in Tarvesh, 2025 (TVS billion)
Item | Value |
|---|---|
Saving | 42 |
Taxes | 65 |
Imports | 58 |
Investment | 38 |
Government spending | 70 |
Exports | 49 |
Define the term injection indicated in bold in the text (Text A, paragraph 2).
One of 51 short multiple-choice questions on 3.1. Pick an answer to see why it's right or wrong.
In one year, nominal GDP rises by 6% and the GDP deflator rises by 8%. What happened to real GDP?
The official deck for this part of the syllabus.
Explain why measuring national output and income is the first task of macroeconomics.
State four things, apart from real GDP per capita, that economic well-being depends on.
With a free account, Augment remembers where you stopped and what you have practiced.
A measure of sustainable well-being combining life expectancy and self-reported well-being, divided by the ecological footprint, showing how efficiently countries turn resources into long, happy lives.
A method of measuring national income by adding up all incomes earned by the factors of production (wages, rent, interest and profit), excluding transfer payments.
Economic activity that is not registered with or regulated by the government and is not recorded in official statistics, such as unregistered trading and cash-in-hand work.
The system of measuring the total value of an economy’s output, income and expenditure over a period of time, usually a quarter or a year.
Income earned abroad by a country’s residents (profits, interest, dividends and wages) minus income paid to non-residents; the difference between GNI and GDP.
A value measured at the prices of the time it refers to (current prices), with no adjustment for changes in the price level.
A composite measure of well-being published by the OECD, covering 11 topics such as income, jobs, health, environment and life satisfaction, which users can weight themselves.
A method of measuring national income by adding up the value added by every firm and industry in the economy, which avoids double counting intermediate goods.
Per person: a total, such as GDP, GNI or spending, divided by the population, used to compare averages between countries or over time.
The real GDP an economy can produce when all its factors of production are employed at normal, sustainable rates; shown by the long-term growth trend.
An exchange rate at which a given basket of goods and services costs the same in two countries; values converted at PPP rates allow for differences in price levels.
GDP measured at the constant prices of a base year, so that changes in it show changes in the volume of output rather than in prices.
A value adjusted for changes in the price level, measured at the constant prices of a base year, so that it reflects changes in quantity only.
A period in which real GDP falls, commonly defined as two consecutive quarters of negative real GDP growth.
The lowest point of real GDP in a business cycle, where a contraction ends and recovery begins.
The value of a firm’s output minus the cost of the intermediate goods and services it buys from other firms; the sum of all value added equals final output.
An annual ranking of countries by the average rating people give their own lives on a scale from 0 to 10, with an analysis of the factors linked to the differences.
Every year, millions of firms produce goods and services, millions of households earn incomes and spend them, and the government collects taxes and buys goods and services. National income accounting turns this activity into a small number of totals that can be compared from year to year and between countries. Statistical agencies, such as the Office for National Statistics in the UK or the Central Statistics Office in Ireland, publish these accounts every quarter and every year.
The totals measure a flow, not a stock. GDP for 2024 is the value of goods and services produced during 2024, in the same way that a person’s salary is earned over a year. It is a different quantity from wealth, which is the value of assets (houses, shares, savings) owned at a point in time.
The circular flow of income is a model of how money moves between the decision-makers in an economy. In its simplest form there are only two sectors. Households own the factors of production (land, labour, capital and entrepreneurship) and sell their services to firms. In return, firms pay factor incomes: wages for labour, rent for land, interest for capital and profit for entrepreneurship. Households then spend these incomes on the goods and services that firms produce, and the money returns to firms.
In this two-sector model, every dollar that firms pay out comes back to them as spending, so the flow of income is constant. Real economies have three more sectors, and money can leave the flow or enter it through each of them:
The financial sector (banks and other financial institutions). Households do not spend all their income: part of it is saving. Saving is a leakage from the flow. Banks lend these funds to firms, which spend them on capital goods such as machines and buildings: investment is an injection into the flow.
The government. Households and firms pay taxes, a leakage. The government spends on goods and services such as schools, hospitals and roads (government spending), an injection.
The foreign sector. Spending on imports goes to firms abroad, so it is a leakage from the domestic flow. Spending by foreigners on a country’s exports is an injection.
The diagram shows the five sectors: households and firms exchange factor incomes and consumer spending, while the financial sector, the government and the foreign sector each take a leakage out of the flow and return an injection into it. Leakages are S + T + M and injections are I + G + X.
The size of the flow depends on how leakages and injections compare. When injections are greater than leakages, more money enters the flow than leaves it, so total spending and national income rise. When leakages are greater than injections, national income falls. When the two are equal, the level of national income is stable. This idea returns in the study of aggregate demand, where the components of spending are analysed one by one.
Situation | Effect on the circular flow | Example |
|---|---|---|
I + G + X > S + T + M | National income rises | Firms invest heavily in new factories while export orders grow. |
I + G + X < S + T + M | National income falls | Households save more because they fear losing their jobs. |
I + G + X = S + T + M | National income is stable | Leakages and injections balance. |
The circular flow also shows the key concept of interdependence. A household’s income is a firm’s cost, and one household’s spending is another household’s income. When one group cuts its spending, the incomes of other households and firms fall as the effect spreads through the flow.
The circular flow suggests three points at which national income can be measured: where goods and services are produced, where incomes are paid, and where money is spent. Each gives a separate method, and in principle each gives the same total.
The output approach adds up the value of everything produced in the economy. A simple way would be to add up the value of all goods and services sold, but this would count many things more than once. A loaf of bread contains flour, which contains wheat; if the wheat, the flour and the bread were all counted, the wheat would be counted three times.
To avoid double counting, the output approach adds up only the value added at each stage of production: the value of a firm’s output minus the value of the intermediate goods it bought from other firms. The sum of value added at every stage equals the value of the final good.
The income approach adds up all the incomes earned by the factors of production in producing the year’s output: wages and salaries, rent, interest and profit. Each dollar of value added is paid to someone as one of these incomes, so the total equals the total of value added. Transfer payments such as pensions, unemployment benefits and student grants are left out, because they are not payments for producing anything: they move income from taxpayers to recipients.
The expenditure approach adds up all spending on final goods and services produced in the economy. It is the method used in most calculations, and it divides spending into four components:
Consumption (C): household spending on goods and services, from food and clothes to haircuts and streaming subscriptions.
Investment (I): spending by firms on capital goods (machinery, buildings, software), plus new housing and changes in firms’ inventories.
Government spending (G): spending by the government on goods and services, such as the salaries of teachers and nurses or the construction of roads. Transfer payments are excluded.
Net exports (X − M): spending by foreigners on the country’s exports minus spending by residents on imports. Imports are subtracted because C, I and G include spending on foreign goods, which were not produced in the country.
The three methods measure the same flow at different points. Whatever is produced (output) is sold to someone, so it is matched by spending (expenditure); and the money received from that spending is paid out to the people who supplied the factors of production, as wages, rent, interest or profit (income). Profit is the balancing item: if a firm sells its output for more than it pays in wages, rent and interest, the difference is profit, which is the entrepreneur’s income.
Unsold output appears to break this rule, but national accountants treat goods that firms produce and keep in stock as investment in inventories, as if the firm had bought them from itself. With this convention, output always equals expenditure. In practice, the three totals published by a statistics office differ slightly, because the data come from different surveys and tax records; the difference is reported as a statistical discrepancy.
The most widely used measure of an economy’s output is gross domestic product. “Domestic” means that GDP counts output produced inside the country’s borders, whoever owns the firms or factors of production. A car made in the UK by a factory owned by a Japanese firm is part of UK GDP. “Gross” means that no deduction is made for the wearing out of capital goods (depreciation) during the year.
When GDP is valued at the prices of the year in which the output was produced, it is called nominal GDP (or GDP at current prices). Nominal GDP is the starting point for every other measure, but on its own it can rise simply because prices rise, a problem dealt with by converting it into real GDP.
Included in GDP | Excluded from GDP | Why excluded |
|---|---|---|
Final goods and services sold in markets | Intermediate goods | Already counted inside the price of the final good (double counting) |
Government spending on goods and services (teachers’ salaries, roads) | Transfer payments (pensions, unemployment benefits) | A transfer of income, not payment for output |
New houses and new capital goods | Second-hand goods (a used car) | Produced and counted in an earlier year |
Firms’ additions to inventories | Purchases of shares, bonds and other financial assets | A change in ownership of assets, not production |
Estimates for some non-marketed items (owner-occupied housing, government services at cost) | Most unpaid work (childcare and housework at home, volunteering) and much of the informal economy | No market price, and hard to observe |
The last row matters for interpreting GDP. Government services such as state schooling are not sold at a market price, so statisticians value them at what they cost to provide. Unpaid work at home has no price at all and is left out, even though it adds to people’s well-being; this is one reason GDP is an imperfect measure of living standards.
The table gives national income data for Country A, a hypothetical economy, for one year ($ billion).
Item | $ billion |
|---|---|
Consumption | 620 |
Investment | 180 |
Government spending on goods and services | 210 |
Transfer payments (pensions and benefits) | 95 |
Exports | 240 |
Imports | 275 |
Sales of second-hand cars | 30 |
GDP measures what is produced inside a country. GNI measures the income that the country’s residents (its households, firms and government) receive, wherever it was earned. The two differ because some residents earn income abroad, and some of the income generated inside the country is paid to foreigners.
Income earned abroad by residents includes the profits of a domestic firm’s foreign subsidiaries, interest and dividends on foreign assets, and the wages of residents who work across the border for short periods.
Income paid to non-residents includes the profits that foreign-owned firms send back to their owners, interest paid to foreign lenders, and the wages of foreign workers who commute into the country.
The difference between the two flows is net income from abroad. When it is positive, GNI is larger than GDP; when it is negative, GNI is smaller.
For most large economies, GDP and GNI are close. In some they differ a great deal, and the direction of the difference says something about the economy:
Country (2024) | GDP (US$ billion) | GNI (US$ billion) | Why they differ |
|---|---|---|---|
Philippines | 461.7 | 521.6 | Filipinos working abroad on short contracts, such as seafarers, earn wages counted as income from abroad, so GNI is about 13% higher than GDP. |
Luxembourg | 93.3 | 61.0 | Many workers commute daily from France, Belgium and Germany, and much of the profit of firms based there belongs to foreign owners, so GNI is about 35% lower. |
Ireland | 609.2 | 457.7 | Multinational firms based in Ireland send large profits to foreign owners (the case study examines this). |
Sources: World Bank, World Development Indicators, GDP and GNI in current US$ (2026).
GNI is often a better guide to the income available to a country’s people, which is why the World Bank uses GNI per capita to classify countries by income. GDP is the better guide to the level of production and employment inside the country, which is why it is used to measure economic growth and the business cycle.
YouTubeNominal GDP can rise for two reasons: because the economy produces more goods and services, or because the prices of those goods and services have risen. Only the first makes people better off. If every price doubled and output stayed the same, nominal GDP would double, but nobody could consume a single extra good. To measure changes in the volume of output, economists remove the effect of changes in the price level.
A real value answers the question “how much more is being produced?”, while a nominal value answers “how much more is being spent?”.
The adjustment uses a price index called the GDP deflator. It measures the average price of all goods and services in GDP (consumer goods, capital goods, government services and exports) compared with a base year, in which its value is set at 100. A deflator of 110 means that prices are on average 10% higher than in the base year. It differs from the consumer price index, which covers only the goods and services households buy, although both measure the same kind of change.
To convert a nominal value into a real value, divide by the deflator and multiply by 100:
The same formula turns nominal GNI into real GNI. Real GDP is the measure used to calculate economic growth, defined as the percentage change in real GDP from one period to the next.
When the price level falls (deflation), the deflator is lower than in the previous year and real GDP grows faster than nominal GDP. Nominal GDP can then fall even though the volume of output has risen.
A large economy is not necessarily a rich one. India’s GDP is many times larger than Switzerland’s, but it is shared among a population more than 150 times as large. To compare average living standards, total output or income is divided by the population to give a per capita figure.
Per capita figures matter most when population grows quickly. If real GDP rises by 3% while the population rises by 3%, output per person does not change at all. In several low-income countries with fast population growth, real GDP has grown for years while real GDP per capita has barely moved.
The table gives further hypothetical data for Country A. Year 1 is the base year.
Year 1 | Year 2 | |
|---|---|---|
Nominal GDP ($ billion) | 975 | 1,050 |
Net income from abroad ($ billion) | −22 | −22 |
GDP deflator | 100 | 104 |
Population (million) | 50 | 51 |
To compare countries, GDP per capita must be converted into a common currency, usually US dollars. Using market exchange rates creates a problem: the same amount of money buys far more in some countries than in others. A haircut, a bus ticket or a restaurant meal costs much less in India or Egypt than in Switzerland, because wages and rents are lower. At market exchange rates, the incomes of people in low-price countries look smaller than the quantity of goods and services they can actually buy.
Purchasing power parity (PPP) exchange rates correct for this. A PPP exchange rate is the rate at which the same basket of goods and services would cost the same in both countries. GDP converted at PPP rates is expressed in “international dollars”, each of which buys in any country what one US dollar buys in the United States.
The chart compares GDP per capita at market exchange rates and at PPP in 2024. For the United States the two are equal, by definition. For Switzerland, where prices are high, the PPP figure is lower. For India, Egypt and Nigeria, where prices are low, the PPP figure is roughly four to eight and a half times the market figure. The gap between rich and poor countries is still very large at PPP, but it is much smaller than market exchange rates suggest.
PPP figures are the better measure for comparing living standards between countries; market exchange rate figures are the better measure of a country’s weight in world trade and finance, since imports and debts are paid at market rates. PPP rates are themselves estimates, based on price surveys of a basket that cannot reflect what people buy in every country, so small differences between countries at PPP should not be over-interpreted.
Measure | What it adjusts for | Best used for |
|---|---|---|
Nominal GDP | Nothing | The size of the economy in current money terms (for example, debt as a share of GDP) |
Real GDP | Changes in the price level over time | Economic growth and the business cycle |
Real GDP per capita | Price changes and population size | Changes in average living standards over time |
GDP per capita at PPP | Population and differences in price levels between countries | Comparing average living standards between countries |
GNI (real, per capita, at PPP) | Also net income from abroad | The income available to residents, especially where large flows of income cross borders |
Real GDP does not grow smoothly. Over many decades most economies grow, as the quantity and quality of their factors of production increase and technology improves, but from year to year growth speeds up, slows down and sometimes turns negative. These short-term fluctuations are called the business cycle.
The long-term growth trend shows the path that real GDP would follow if the economy always produced at its potential output: the level of output it can sustain when all its resources are fully employed at a normal rate of use. The trend rises over time because potential output grows. In the production possibilities curve model, growth in potential output is an outward shift of the curve, and the business cycle is a movement of actual output towards and away from the curve.
The diagram shows real GDP on the vertical axis and time on the horizontal axis. The dashed line is the long-term trend, and the wave is actual real GDP. Each cycle has four phases:
Expansion (recovery and boom). Real GDP grows. Firms hire more workers, unemployment falls, incomes and spending rise, and business confidence improves. When growth is fast and actual output rises above potential output, the economy is in a boom: firms run short of workers and capacity, so costs and prices start to rise faster.
Peak. The highest point of real GDP in the cycle, where growth stops and the economy turns down.
Contraction (recession). Real GDP falls. Firms cut production, investment and hiring; unemployment rises and incomes and spending fall. A severe and long-lasting recession is called a depression.
Trough. The lowest point of real GDP in the cycle, where the contraction ends and recovery begins.
The two-quarter rule is a convenient test, not a law. Some official bodies, such as the committee that dates business cycles in the United States, also look at employment, incomes and sales, and can declare a recession that does not meet the two-quarter rule.
A trough is the opposite turning point to a peak: the lowest level of real GDP before output starts to grow again. The vertical distance between actual real GDP and the trend at any moment is an output gap. When actual output is below potential, as near a trough, there is a deflationary gap with unused resources and cyclical unemployment. When actual output is above potential, as in a boom, there is an inflationary gap. Both are analysed with the AD/AS model.
The phases are not of equal length, and no two cycles are the same. Expansions usually last several years, while recessions are usually shorter, often lasting a few quarters. The causes of the fluctuations lie in changes in total spending and in costs of production, such as a fall in business confidence, a financial crisis, or a sudden rise in oil prices.
Real-world cycles are less regular than the diagram. The chart shows quarterly real GDP in the United Kingdom since 2006, with two very different contractions.
In 2008–09 the global financial crisis caused a deep recession: UK real GDP fell for five consecutive quarters, by 6.4% from peak to trough, and did not regain its 2008 peak until 2013. World real GDP fell by 1.3% in 2009, a rare fall in total world output. The recovery was slow because households and banks were repaying debt, which held back spending for years.
The COVID-19 pandemic produced the sharpest contraction in modern data. UK real GDP fell by 2.7% in the first quarter of 2020 and by a further 19.9% in the second, as lockdowns closed shops, restaurants and factories. India’s real GDP in April–June 2020 was about 23% lower than a year earlier, and world real GDP fell by 2.9% over the year. Because the cause was temporary, the rebound was also unusually fast once restrictions were lifted, which makes 2020 an extreme example of the business cycle rather than a typical one.
Sources: IMF, International Financial Statistics, via FRED, series NGDPRSAXDCGBQ and NGDPRNSAXDCINQ (2026); World Bank, World Development Indicators, NY.GDP.MKTP.KD.ZG (2026).
YouTubeThe table shows a hypothetical economy’s quarterly real GDP growth rate (% change on the previous quarter).
Quarter | Q1 | Q2 | Q3 | Q4 | Q5 | Q6 |
|---|---|---|---|---|---|---|
Real GDP growth (%) | 0.8 | 0.2 | −0.4 | −0.9 | −0.1 | 0.5 |
GDP and GNI were designed to measure output and income, and they do this well. They are often used as measures of living standards and economic well-being too, because higher real income per person allows people to buy more food, housing, health care and education. Across countries, real GDP per capita is closely linked with life expectancy, years of schooling and access to clean water. The question is how far a measure of output can stand for the many-sided idea of well-being.
Real GDP per capita already corrects for changes in prices and population. Other problems remain when it is used to judge whether people in a country are better off than they were ten or twenty years ago:
Distribution of income. Real GDP per capita is an average. If most of the growth goes to the richest households, the average rises while the income of a typical household may barely change. Inequality and its link to equity are not captured.
Quality of goods and new products. Price indices struggle to allow for quality. A smartphone today costs about the same as a basic mobile phone did twenty years ago but does far more, and many free digital services (maps, search, video calls) have no price at all. Real GDP may understate how much living standards have improved.
Changes in non-marketed output. When people pay for childcare, meals and cleaning that families once did at home, GDP rises even if the total amount of work done is the same. Measured growth may overstate the improvement.
Changes in the informal economy. If activity moves from the informal economy into the formal, recorded economy, for example because tax rules change, measured GDP rises without any change in actual output.
Environmental costs. Output that pollutes the air or uses up forests and fish stocks is counted as a gain, while the damage is not subtracted. Cleaning up after a disaster even adds to GDP. Growth that runs down natural capital overstates the gain in well-being and conflicts with sustainability.
Leisure. If people work longer hours to produce more, GDP rises, but their lost leisure is not counted. Shorter working weeks over the past century raised well-being in a way that GDP does not show.
Composition of output. GDP does not distinguish between spending on schools and spending on prisons, weapons or repairing flood damage. A rise in output that is mostly defence spending adds less to well-being than the same rise in health care.
Comparing countries adds further problems, because countries differ in their prices, their statistical systems and their way of life:
Price levels and exchange rates. At market exchange rates, GDP per capita understates living standards in countries with low prices. PPP conversion corrects most of this, but PPP rates are estimates.
Size of the informal economy. Informal activity is a far larger share of output in low-income countries, so their GDP is understated more than that of high-income countries.
Non-marketed output. Subsistence farming, home production and unpaid care are much more important in some countries than in others.
Inequality. Two countries with the same GDP per capita can have very different income distributions and so very different living standards for most people.
Hours worked, environmental damage and composition of output differ between countries, so equal GDP per capita can come with very different amounts of leisure, pollution or defence spending.
Data quality. Statistics offices in some countries have fewer resources, and national accounts may be revised heavily when the base year is updated. Nigeria’s 2014 revision, which brought in industries such as telecommunications, banking and film that the old figures had largely missed, raised measured GDP sharply overnight.
The informal economy is far from a small correction. In 2018, about two billion people, more than 61% of the world’s employed population, worked informally; the share was 85.8% in Africa and 25.1% in Europe and Central Asia. Statistics offices estimate some informal output, but in countries where most people work informally, GDP is much more uncertain.
Sources: International Labour Organization, _Women and men in the informal economy: a statistical picture (2018)._
Limitation | Effect on GDP as a measure of well-being | Partial remedy |
|---|---|---|
Price changes over time | Nominal GDP overstates growth | Use real GDP |
Population size | Total GDP hides average income | Use per capita figures |
Differences in price levels between countries | Understates incomes in low-price countries | Use PPP |
Income flows across borders | GDP can overstate residents’ income | Use GNI |
Inequality | The average hides the typical household | Gini coefficient, median income |
Informal economy and non-marketed output | Understates output, more in low-income countries | Survey-based estimates |
Environmental costs | Overstates sustainable gains | Green GDP, environmental indicators |
Leisure, quality, composition of output | Missed or counted as gains | Composite well-being measures |
One proposed adjustment for environmental damage is green GDP, which subtracts the estimated cost of pollution and the depletion of natural resources from GDP. It is difficult to calculate, because it requires a money value for clean air, lost species and climate damage, and few countries publish it regularly.
GDP and GNI remain the most widely used measures of economic performance for good reasons. They are produced to international standards in almost every country, published quickly and often, and measured in money, so they can be compared and added up. Higher real income per person gives a society more resources to spend on health, education and the environment, which is why real GDP per capita is strongly linked with most other indicators of well-being.
Their weakness is that they measure the quantity of market output, not how it is shared, what it is used for, what it costs in leisure and the environment, or how people feel about their lives. How good a guide they are depends on the comparison. For one country over a short period, real GDP per capita is a reasonable guide to changes in material living standards. Over long periods, and between countries with very different prices, informal sectors, inequality or environmental pressures, it can mislead. The reasonable judgment is that GDP is a necessary starting point that should be used alongside other measures, not on its own.
Because GDP measures only output, several organisations have built measures that look at well-being directly. They differ in what they include, and none of them replaces GDP; each answers a different question.
The OECD Better Life Index, first published by the Organisation for Economic Co-operation and Development in May 2011, compares well-being in OECD member countries and some partner countries across 11 topics: housing, income, jobs, community, education, environment, civic engagement, health, life satisfaction, safety and work–life balance. Each topic is measured by a few indicators, such as air pollution, life expectancy or the share of employees working very long hours.
The distinctive feature of the index is that users choose the weights. On its website, each person scores each topic from 0 to 5 depending on how much it matters to them, and the ranking is recalculated. A country that is strong on income and jobs but weak on work–life balance may rank highly for one user and poorly for another, which makes the point that judgments of well-being depend on values as well as data.
The World Happiness Report ranks countries by how people rate their own lives. In surveys carried out by Gallup in each country, people are asked to imagine a ladder with steps numbered from 0 (the worst possible life for them) to 10 (the best possible life) and to say which step they stand on. A country’s score is the average answer over three years. The report then examines how much of the difference between countries is linked to six factors: GDP per capita, social support, healthy life expectancy, freedom to make life choices, generosity and perceptions of corruption.
In the 2026 report, Finland ranked first for the ninth year in a row, with a score of 7.76, followed by Iceland and Denmark; Afghanistan ranked last of 147 countries. Costa Rica ranked fourth, ahead of every other country in the Americas, even though its GDP per capita at PPP was about $31,600 in 2024, less than half of Finland’s (about $65,100) and well below that of the United States (about $86,200).
Sources: World Happiness Report 2026 (Wellbeing Research Centre, University of Oxford, with Gallup and the UN Sustainable Development Solutions Network); World Bank, World Development Indicators (2026).
The Happy Planet Index measures how efficiently countries turn natural resources into long, happy lives. It combines three elements: life expectancy, self-reported well-being, and the country’s ecological footprint (the area of land and sea needed to supply the resources its people use and absorb their waste). Roughly, it multiplies well-being by life expectancy and divides by the ecological footprint, so a country scores highly when its people live long, satisfied lives without using more than a sustainable share of the planet’s resources.
The results differ sharply from GDP rankings. In the 2026 index, which covers 134 countries, Costa Rica ranked first, followed by Guatemala, Tajikistan, Spain and Colombia. Many high-income countries score poorly because their large ecological footprints outweigh their long life expectancy and high life satisfaction. The index also has critics: a country can score well partly because it is too poor to consume much, and Tajikistan’s economy depends heavily on income sent home by migrants working abroad.
Sources: Hot or Cool Institute, Happy Planet Index (2026).
OECD Better Life Index | World Happiness Report | Happy Planet Index | |
|---|---|---|---|
What it measures | Material conditions and quality of life across 11 topics | How people rate their own lives (0–10) | Long, happy lives per unit of ecological footprint |
Main data | Official statistics and surveys | Gallup World Poll | Life expectancy, survey well-being, ecological footprint |
Coverage | OECD members and partners | About 140–150 countries | 134 countries (2026) |
Main strength | Many dimensions; users choose weights | Asks people directly about their lives | Links well-being to sustainability |
Main limitation | Few countries; the result depends on the weights | Answers depend on culture, expectations and mood | Rewards low consumption even where it reflects poverty |
All three show that well-being cannot be read from output alone, and they point to policies that GDP ignores, such as protecting the environment, reducing working hours or strengthening social support. Their limitations are the mirror image of GDP’s strengths. They involve judgments about what to include and how to weight it, rely on surveys that are harder to compare across cultures, and are published less often. The most informative approach uses GDP or GNI for material living standards and these measures to show what GDP leaves out.
Key concept | Where it appears |
|---|---|
Economic well-being | GDP per capita as a measure of material living standards, and its limits; alternative measures of well-being |
Change | The business cycle and long-term growth; real values that separate changes in quantity from changes in prices |
Sustainability | Environmental costs missing from GDP; green GDP and the Happy Planet Index |
Equity | Average income hides how income is distributed |
Interdependence | The circular flow; net income from abroad linking GDP and GNI |
Ireland shows more clearly than any other country how GDP and GNI can diverge, and why GDP can be a poor guide to the income and well-being of a country’s residents. Ireland has a low rate of corporation tax and is the European base of many large multinational firms, especially in technology and pharmaceuticals. Their activity in Ireland is counted in Irish GDP, but most of the resulting profit belongs to foreign shareholders.
In 2015, real GDP in Ireland rose by about 25% in a single year (24.6% in the latest World Bank data; the first official estimate in July 2016 was 26.3%). Employment, wages and consumer spending grew at nothing like this rate. The main cause was that several multinationals moved ownership of their intellectual property, such as patents and software rights, to Irish subsidiaries, and aircraft-leasing firms expanded their fleets there. The capital stock and output recorded in Ireland jumped, although very little extra production by Irish workers took place. The economist Paul Krugman called the episode “leprechaun economics”.
The chart shows the three measures between 2010 and 2024. GNI is well below GDP every year, because of large negative net income from abroad: in 2024, net factor income paid to the rest of the world was €134.2 billion, nearly a quarter of GDP. Even GNI was distorted, so in 2017 the Central Statistics Office introduced modified GNI (GNI*), following the recommendation of an expert Economic Statistics Review Group. GNI* removes from GNI the income of firms that moved their headquarters to Ireland only for tax purposes, and the depreciation of foreign-owned intellectual property and leased aircraft, which inflate the Irish accounts without supporting Irish incomes.
Ireland, 2024 | GDP | GNI | GNI* |
|---|---|---|---|
€ billion, current prices | 561.9 | 428.4 | 321.6 |
€ per person (population 5.40 million) | about 104,100 | about 79,400 | about 59,600 |
Sources: Central Statistics Office Ireland, tables NA001 and NA002 (2026); World Bank, World Development Indicators, population and GDP growth (2026).
The difference in measured growth is equally striking. In 2015, real GNI* rose by only 1.8%, compared with about 25% for real GDP. Per person, Irish GDP in 2024 was about US$112,900, among the highest in the world, but GNI* per person was little more than half of GDP per person. Living standards in Ireland are high, but they are much closer to those of other western European countries than GDP per capita suggests.
Several lessons follow. GDP measures production in a place, so where much of that production is owned from abroad, GNI is the better measure of residents’ income. Even GNI can be distorted by accounting decisions of a few large firms, which is why statisticians designed a further measure. For the same reason, ratios such as government debt as a percentage of GDP flatter Ireland: measured against GNI*, the debt burden looks much heavier.
The case also has limits as a lesson. Ireland is an extreme example: in most economies GDP and GNI differ by only a few per cent, and GDP remains the better measure of production and of the business cycle. GNI* is a measure only Ireland publishes, so it cannot be used to compare Ireland with other countries. And none of the three measures says anything about how income is shared, or about housing costs, which have been a major concern in Ireland during the period of rapid measured growth.
Sources: Central Statistics Office Ireland, Modified GNI tables NA001 and NA002 (2026); World Bank, World Development Indicators (2026); “Leprechaun economics”, Wikipedia (accessed October 2026).
Questions on national income accounting appear mostly in Paper 2, as definitions [2], calculations [2–3] and the business cycle diagram, and through Paper 1 questions on GDP as a measure of well-being. HL Paper 3 can also set these calculations as part of a longer data question.
Definitions in Paper 2 are marked on precision. For GDP, the full answer mentions the market value, final goods and services, within a country’s borders and over a period of time. For real GDP, it mentions adjustment for changes in the price level (inflation).
Calculations with a deflator are the most common source of lost marks: convert each year to real values first, then calculate the percentage change between the real values.
Paper 1 questions on this content usually ask about GDP as a measure of well-being. Part (a) needs explanation without evaluation; part (b) needs real examples and a judgment.
The circular flow of income shows households and firms exchanging factor incomes and spending; saving, taxes and imports leak out, and investment, government spending and exports are injected.
National income can be measured by output (value added), income or expenditure; all three give the same total.
Nominal GDP = C + I + G + (X − M) measures output produced within a country; GNI = GDP + net income from abroad measures the income of its residents.
Real values remove the effect of price changes: real GDP = nominal GDP ÷ deflator × 100. Economic growth is the percentage change in real GDP.
Per capita figures allow for population; PPP exchange rates allow for different price levels between countries.
The business cycle is the fluctuation of real GDP around a rising long-term trend (potential output): expansion and boom, peak, contraction or recession, and trough.
GDP is a useful but partial measure of well-being: it misses inequality, quality, non-marketed and informal output, leisure, environmental costs and the composition of output.
The OECD Better Life Index, the World Happiness Report and the Happy Planet Index measure well-being more directly, but rely on weights, surveys and judgments of their own.
I can draw the circular flow of income with five sectors and explain leakages and injections.
I can explain why the output, income and expenditure approaches give the same total.
I can calculate nominal GDP using C + I + G + (X − M) and nominal GNI from GDP and income flows.
I can calculate real GDP and real GNI with a deflator, and real GDP and GNI per capita.
I can explain the difference between GDP and GNI, nominal and real, and market exchange rate and PPP figures.
I can draw and label a business cycle diagram and explain each phase.
I can evaluate GDP as a measure of well-being for comparisons over time and between countries, with real examples.
I can describe the OECD Better Life Index, the World Happiness Report and the Happy Planet Index and compare them with GDP.
Vague definition [1]: The idea that it is money added to the economy.
Accurate definition [2]: An understanding that it is spending that enters the circular flow of income which does not originate from domestic households' consumption: investment, government spending or exports.
N.B. Award [1] for a list of investment, government spending and exports without explanation.
Using information from Table 1, calculate the difference between total leakages and total injections in Tarvesh in 2025.
2 marks
[1] for valid working, [1] for the correct answer of TVS 8 billion.
An answer of 8 billion without working is sufficient for [1].
Using your answer to (b)(i), state whether Tarvesh's national income is likely to rise or fall.
1 mark
Fall, because leakages are greater than injections [1].
OFR applies. Working not required.
Using a circular flow of income diagram, explain how the recession in Holvenia is likely to affect household incomes in Tarvesh (Text A, paragraphs 1 and 2).
4 marks
Level 1 [1–2]: There is a correct diagram OR an accurate written response.
Level 2 [3–4]: There is a correct diagram AND an accurate written response.
For Level 2, responses should include:
Diagram: a circular flow of income diagram showing households and firms, with factor incomes and consumption expenditure, and the foreign sector with exports (X) as an injection into firms and imports (M) as a leakage from households; the reduced export flow should be indicated.
Explanation: lower spending by Holvenia on Tarvesh's exports reduces injections into the flow; Tarvesh's manufacturing firms receive less revenue, cut output and employment and pay less in wages, rent, interest and profit; household incomes fall, so consumption falls further and the flow of income shrinks.
Candidates who incorrectly label diagrams can be awarded a maximum of [3].
The diagram must show the direction of the flows between households, firms and the foreign sector.
Explain two measures the government of Tarvesh could use to bring leakages and injections back into balance at a higher level of national income (Text A, paragraph 3).
4 marks
Level 1 [1–2]: The written response is limited (two measures stated, or one measure explained).
Level 2 [3–4]: The written response is accurate ([3] one measure explained and one stated; [4] two measures explained).
Possible measures include:
increasing government spending (on infrastructure, public services), which raises injections directly;
cutting taxes on household income, which reduces the tax leakage and raises disposable income and consumption;
cutting taxes on firms or offering investment incentives, which raises the investment injection;
lowering interest rates (via the central bank), which reduces the incentive to save and raises investment;
measures to promote exports to other markets.
Accept any other valid measure that is explained in terms of leakages or injections.
Read the extract and answer the questions that follow.
Text A — Port Keswin feels the global slowdown
[1] Port Keswin is a small, high-income city-state whose economy depends on exporting electronic components and refined petroleum products. Exports are equivalent to more than 150 % of its gross domestic product (GDP), because many exported goods are assembled from imported parts and materials.
[2] In 2025 a slowdown in its main export markets cut foreign orders. Manufacturers reduced shifts, and the economy entered a recession. Firms also postponed investment plans. Data for the main flows into and out of Port Keswin's circular flow of income are shown in Table 1.
[3] Some economists argue that the city-state should reduce its dependence on exports by developing financial services, tourism and education for the domestic and regional market.
Table 1: Leakages and injections in Port Keswin (PKD billion)
Item | 2024 | 2025 |
|---|---|---|
Saving | 28 | 25 |
Taxes | 22 | 21 |
Imports | 100 | 88 |
Investment | 30 | 26 |
Government spending | 24 | 24 |
Exports | 96 | 78 |
Define the term recession indicated in bold in the text (Text A, paragraph 2).
2 marks
Using information from Table 1, calculate the change in total injections into Port Keswin's circular flow of income between 2024 and 2025.
2 marks
Using information from Table 1, state whether total leakages were greater than, equal to or less than total injections in 2025.
1 mark
Using a circular flow of income diagram, explain why the fall in Port Keswin's exports was accompanied by a fall in its imports (Text A, paragraph 1 and Table 1).
4 marks
Using an AD/AS diagram, explain the effect of the fall in exports and investment on Port Keswin's real GDP (Text A, paragraph 2).
4 marks
Using information from the text/data and your knowledge of economics, discuss whether Port Keswin should reduce its dependence on exports.
15 marks
Read the extract and answer the questions that follow.
Text A — Who earns what at the Alto Verde coffee cooperative?
[1] The Alto Verde cooperative in Montebrava, a lower-middle-income economy in Central America, grows, processes and exports specialty coffee. It rents hillside land from a local family, employs seasonal pickers and permanent processing workers, and borrowed money from a rural bank to buy drying and roasting machinery.
[2] The cooperative's members take the decisions about which coffee varieties to plant and which buyers to sell to, and they bear the risk if harvests fail or prices fall. This entrepreneurship is rewarded by the cooperative's surplus, which is shared among members at the end of each year.
[3] The cooperative's payments to the owners of factors of production in 2025 are shown in Table 1.
Table 1: Alto Verde cooperative's factor payments, 2025 (MBV thousand)
Payment | Value |
|---|---|
Wages to pickers and processing workers | 540 |
Rent for land | 180 |
Interest on bank loans | 90 |
Surplus (profit) shared among members | 390 |
Define the term entrepreneurship indicated in bold in the text (Text A, paragraph 2).
2 marks
Using information from Table 1, calculate the percentage of the cooperative's total factor payments that was paid as wages in 2025.
2 marks
Identify the factor of production that is rewarded by the interest payments shown in Table 1.
1 mark
Using a circular flow of income diagram, explain how the cooperative's activities link firms and households in Montebrava's economy (Text A, paragraphs 1 and 3).
4 marks