Why should the income, expenditure and output measures of national income give the same figure?

They measure the same circular flow at three different points. The value of what is produced is paid out in full as factor incomes, so output equals income; those incomes are then used to buy the output, so income equals expenditure. Because it is one flow counted three times, the three totals are identical by construction rather than by coincidence.

List the items summed under the income method of measuring national income.

The income method adds the incomes earned by the factors of production from producing output: wages and salaries paid to labour, rent from land and property, interest on capital, and the profits of companies and the self-employed. Only incomes earned from producing goods and services are included.

Why are transfer payments such as state pensions and unemployment benefits excluded from the income measure of national income?

They are not payments for any contribution to output; they simply move purchasing power from one group of people to another. Counting them would inflate the total without any goods or services having been produced, and would also double-count, because the money was already recorded as income when the taxpayer earned it.

Write down the expenditure method of calculating GDP and explain why imports are subtracted.

GDP by expenditure is consumption plus investment plus government spending on goods and services plus exports minus imports, or C + I + G + (X - M). Imports are subtracted because the consumption, investment, government spending and export figures all include some spending on foreign-produced goods. Since the aim is to measure domestic production only, the value of imports has to be taken out again.

An economy records consumption of 1,540 billion pounds, investment of 380 billion pounds, government spending of 520 billion pounds, exports of 720 billion pounds and imports of 790 billion pounds. Calculate GDP by the expenditure method.

GDP = C + I + G + (X - M) = 1,540 + 380 + 520 + (720 - 790). Net exports are 720 - 790 = -70 billion pounds. So GDP = 1,540 + 380 + 520 - 70 = 2,370 billion pounds.

An economy pays out wages and salaries of 1,350 billion pounds, rent of 120 billion pounds, interest of 180 billion pounds and profits of 720 billion pounds, and its expenditure measure of GDP comes to 2,370 billion pounds. Calculate GDP by the income method and comment on the result.

GDP by income = 1,350 + 120 + 180 + 720 = 2,370 billion pounds. This is the same figure as the expenditure calculation, which is what the identity between income, expenditure and output requires. Agreement between the two routes is a check that nothing has been omitted or double-counted.

CCEA AS-Level Economics 4410

Key Economic Concepts

Topic overview The four factors of production Positive statements and normative judgements Economic agents and what they are trying to achieve Capital goods and consumption goods Product markets and factor markets

The Basic Economic Problem of Scarcity and Choice

Topic overview Scarcity, choice and opportunity cost Drawing and reading the production possibility frontier Using a PPF to show choice, opportunity cost, efficiency and growth Why an economy operates inside its frontier Specialisation and the division of labour Free market, planned and mixed economies

Demand and Supply in Product Markets

Topic overview What determines demand and what determines supply Movements along a curve versus shifts of a curve Why the demand curve slopes downwards Why the supply curve slopes upwards: marginal cost and the profit incentive Consumer surplus and producer surplus When consumers do not behave rationally

Markets and Equilibrium

Topic overview Market equilibrium and how markets clear How shifts in demand and supply change the equilibrium Price signals, incentives, rationing and the role of profit Joint, composite and derived demand and joint supply Tracing effects between interrelated markets Community surplus and allocative efficiency Demand and supply in housing, energy and commodity markets Indirect taxes and subsidies: impact and incidence

Elasticity of Demand and Supply

Topic overview Price elasticity of demand: measuring and interpreting Income and cross elasticity: normal, inferior, substitutes and complements Price elasticity of supply What determines the value of an elasticity Elasticity and total revenue How useful is elasticity for firms and government?

Factor Markets: Labour

Topic overview How a competitive labour market sets the wage Elasticity of labour demand and labour supply Wage differentials and why they persist Economic rent and transfer earnings Flexibility: trade unions, welfare and migration Minimum wages and government intervention in the labour market

Market Failures and Imperfections

Topic overview Market equilibrium, the social optimum and the meaning of market failure Externalities: private, external and social costs and benefits Community surplus and the externality diagrams Calculating and interpreting welfare loss Public goods, quasi-public goods and the free rider problem The consequences of missing markets for public goods Merit goods and demerit goods Information gaps and asymmetric information The consequences of merit goods, demerit goods and information failure Market power and other market imperfections Income and wealth inequality Absolute and relative poverty

Government Intervention in Markets

Topic overview Why governments step into markets Indirect taxes Subsidies, and choosing between taxes and subsidies Maximum and minimum prices State provision Regulation Information provision Tradeable pollution permits Government failure

The Circular Flow of Income

Topic overview Households, firms and the two-way flow Injections and withdrawals in an open economy with government Equilibrium and change in the circular flow

Measuring National Income

Topic overview Three routes to the same total: income, expenditure and output GDP as a measure of welfare and its limitations Domestic or national? GDP and GNP compared Nominal and real values: correcting for price changes Total and per capita measures

Aggregate Demand

Topic overview The four components of aggregate demand Why the aggregate demand curve slopes downwards Movements along and shifts in aggregate demand Factors that shift aggregate demand Investment: gross, net and fixed capital

Aggregate Supply

Topic overview Why short-run aggregate supply slopes upwards Factors that shift short-run aggregate supply Movements along and shifts in aggregate supply From the short run to the long run What determines long-run aggregate supply Keynesian and neoclassical views of long-run aggregate supply

Macroeconomic Equilibrium

Topic overview How aggregate demand and aggregate supply determine equilibrium Applying AD-AS analysis to growth and unemployment Applying AD-AS analysis to inflation

Macroeconomic Objectives

Topic overview Why governments target inflation, unemployment, the external balance and growth Objectives beyond the main four: the environment and the distribution of income and wealth Picturing inequality: the Lorenz curve and the Gini coefficient Where the objectives collide: the main policy conflicts Judging the trade-offs: how sharp is a conflict?

Inflation

Topic overview Inflation, deflation and disinflation: what the words actually mean Measuring the rate: the CPI and the RPI Working with index numbers Building a price index: the basket and the significance of weights Demand-pull and cost-push inflation The costs and consequences of inflation and deflation The policy response to inflation

Unemployment

Topic overview The claimant count and the ILO measure of unemployment Calculating and interpreting unemployment statistics Unemployment and economic inactivity: a distinction that changes the numbers The types of unemployment and what distinguishes them The causes of unemployment and of economic inactivity The costs and consequences of unemployment and inactivity Policies for unemployment and intervention in the labour market

Economic Growth

Topic overview Actual and potential growth on a production possibility frontier Measuring economic growth The economic cycle and output gaps The causes of economic growth Benefits, costs and the sustainability of growth Policies to promote economic growth using AD–AS analysis

Fiscal Policy and Its Effects

Topic overview What fiscal policy is and how it works Government spending and taxation: the main categories Direct and indirect taxation Fiscal policy in the AD-AS model Evaluating the impact of fiscal policy on output, employment, prices and agents

Monetary Policy

Topic overview The nature of monetary policy and the interest rate instrument The transmission mechanism from interest rates to aggregate demand Monetary policy in the AD-AS model Evaluating the impact of monetary policy on output, employment, prices and agents

Supply-Side Policies

Topic overview The nature of supply-side policy and tax cuts Deregulation and evaluating market-based supply-side policy Competition and innovation as supply-side policy Infrastructure as supply-side policy Labour market reform Education, training and the skills of the workforce Labour productivity: determinants and significance Supply-side policies in the AD-AS model Evaluating the impact of supply-side policies

Exchange Rates and the National Economy

Topic overview What an exchange rate is and how it is measured Exchange rate changes in the AD-AS model Holding the exchange rate above or below the market clearing level Why a government might have an exchange rate policy Evaluating the impact of exchange rate changes on output, employment, prices and agents

Quantitative Skills in Economics

Topic overview Ratios, shares and proportions in economic data Percentages and percentage changes in economic data Averages, medians and quantiles Index numbers, weighting and rebasing Converting money values to real values Cost, revenue and profit Elasticity: calculating the number and reading its meaning Choosing and reading economic charts and diagrams Interpreting economic data critically

Measuring National Income

5 subtopics
10 things to know
Unit AS 2

What Measuring National Income covers

Measuring national income is examined in Unit AS 2, Managing the National Economy. It covers three routes to the same total: income, expenditure and output, GDP as a measure of welfare and its limitations, domestic or national? GDP and GNP compared, nominal and real values: correcting for price changes and total and per capita measures.

Where it is assessed

Unit AS 2

Managing the National Economy, written examination, 20% of A level.

Check the CCEA specification ↗

The 5 subtopics

Each one has its own page. CCEA AS Economics students sit this topic in the first year.

What you need to know

Answer each one before you reveal it.

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Key term

Why do the three measures of national income rarely produce exactly the same figure in official statistics, even though they must be equal in principle?

Key term

Why do improvements in the quality of goods create difficulties for GDP as a measure of welfare over time?

Key term

What is the difference between Gross Domestic Product and Gross National Product?

Key term

Which measure, GDP or GNP, is the better guide to the income available to a country's residents, and why?

Key term

Why would a government tracking domestic employment prefer GDP to GNP?

Numbers

Nominal GDP is 2,370 billion pounds and the GDP deflator is 118.5 with the base year set at 100. Calculate real GDP at base-year prices.

Key term

Why can nominal GDP rise in a year in which the economy has actually produced less?

Numbers

Average earnings rise from 34,000 pounds to 35,360 pounds while the consumer price index rises from 100 to 106.5. Calculate the change in real earnings.

Key term

What is GDP per capita, and why is it usually preferred to total GDP when living standards are being compared?

Key term

Distinguish between GDP per capita and productivity, and explain why the two can move in different directions.

Take Measuring National Income further

The same content, four other ways.

Questions from this topic

Each one with the model answer underneath.

1
Why should the income, expenditure and output measures of national income give the same figure?
Model answer
They measure the same circular flow at three different points. The value of what is produced is paid out in full as factor incomes, so output equals income; those incomes are then used to buy the output, so income equals expenditure. Because it is one flow counted three times, the three totals are identical by construction rather than by coincidence.
2
List the items summed under the income method of measuring national income.
Model answer
The income method adds the incomes earned by the factors of production from producing output: wages and salaries paid to labour, rent from land and property, interest on capital, and the profits of companies and the self-employed. Only incomes earned from producing goods and services are included.
3
Why are transfer payments such as state pensions and unemployment benefits excluded from the income measure of national income?
Model answer
They are not payments for any contribution to output; they simply move purchasing power from one group of people to another. Counting them would inflate the total without any goods or services having been produced, and would also double-count, because the money was already recorded as income when the taxpayer earned it.
4
Write down the expenditure method of calculating GDP and explain why imports are subtracted.
Model answer
GDP by expenditure is consumption plus investment plus government spending on goods and services plus exports minus imports, or C + I + G + (X - M). Imports are subtracted because the consumption, investment, government spending and export figures all include some spending on foreign-produced goods. Since the aim is to measure domestic production only, the value of imports has to be taken out again.
5
An economy records consumption of 1,540 billion pounds, investment of 380 billion pounds, government spending of 520 billion pounds, exports of 720 billion pounds and imports of 790 billion pounds. Calculate GDP by the expenditure method.
Model answer
GDP = C + I + G + (X - M) = 1,540 + 380 + 520 + (720 - 790). Net exports are 720 - 790 = -70 billion pounds. So GDP = 1,540 + 380 + 520 - 70 = 2,370 billion pounds.
6
An economy pays out wages and salaries of 1,350 billion pounds, rent of 120 billion pounds, interest of 180 billion pounds and profits of 720 billion pounds, and its expenditure measure of GDP comes to 2,370 billion pounds. Calculate GDP by the income method and comment on the result.
Model answer
GDP by income = 1,350 + 120 + 180 + 720 = 2,370 billion pounds. This is the same figure as the expenditure calculation, which is what the identity between income, expenditure and output requires. Agreement between the two routes is a check that nothing has been omitted or double-counted.

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Key Economic Concepts

The Basic Economic Problem of Scarcity and Choice

Demand and Supply in Product Markets

Markets and Equilibrium

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Measuring National Income revision questions

Is Measuring National Income examined at AS in CCEA Economics?: Yes. It sits in Unit AS 2, which you take in the first year, so it is on the AS paper as well as counting towards the full A level.
What does Measuring National Income cover in CCEA AS-Level Economics?: 5 subtopics: three routes to the same total: income, expenditure and output, gdp as a measure of welfare and its limitations, domestic or national? gdp and gnp compared, nominal and real values: correcting for price changes and total and per capita measures. Each one has its own page with questions and model answers.
How is Measuring National Income organised?: By the CCEA 4410 specification, subtopic by subtopic, so it matches the order you are taught it in.

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