Measures of Economic Performance
Measures of Economic Performance
Assessing an economy's health requires measuring its performance across several key indicators. At A-Level, you need to understand how these are measured, their significance, and their limitations.
Gross Domestic Product (GDP)
GDP is the total value of all final goods and services produced within a country's borders in a given period (usually a year or quarter).
Three Methods of Measurement
| Method | What It Measures |
|---|---|
| Output (production) | Value added at each stage of production across all industries |
| Income | Total incomes earned by factors of production (wages, rent, interest, profit) |
| Expenditure | Total spending on final goods and services: C + I + G + (X - M) |
All three should give the same figure (the circular flow identity), though statistical discrepancies arise in practice.
Real vs Nominal GDP
- Nominal GDP (money GDP): measured at current prices — affected by inflation
- Real GDP: adjusted for inflation using a base year — measures actual changes in output
- GDP deflator = (Nominal GDP / Real GDP) × 100
GDP Per Capita
GDP per capita = GDP ÷ population. More useful for comparing living standards across countries of different sizes.
Purchasing Power Parity (PPP)
Adjusts GDP for differences in price levels between countries. A dollar buys more in India than in Switzerland — PPP adjusts for this, giving a more accurate comparison of living standards.
Limitations of GDP as a Measure of Living Standards
- Distribution: GDP does not show how income is distributed — a high GDP may coexist with extreme poverty
- Non-market activity: excludes household work, voluntary work, subsistence farming
- Informal/shadow economy: cash-in-hand work, black market activity not recorded (estimated at 10% of UK GDP)
- Quality of life: ignores leisure time, environmental quality, health, crime, well-being
- Composition of output: military spending raises GDP but may not improve welfare
- Sustainability: resource depletion and environmental damage not subtracted
- Population growth: GDP may rise while GDP per capita falls
- Accuracy: data collection is imperfect, subject to revisions
Alternative Measures
| Measure | What It Captures |
|---|---|
| GNI (Gross National Income) | Income earned by a country's residents, wherever earned (GDP + net income from abroad) |
| HDI (Human Development Index) | Life expectancy, education, GNI per capita (UNDP) |
| Genuine Progress Indicator | GDP adjusted for inequality, environmental costs, unpaid work |
| Happiness indices | Subjective well-being surveys (ONS UK well-being measures) |
Inflation
Inflation is a sustained increase in the general price level over time, reducing the purchasing power of money.
Measurement
Consumer Price Index (CPI):
1. A basket of goods representing typical household spending is identified
2. Prices are collected monthly from ~140 locations across the UK
3. Items are weighted according to spending patterns
4. The index tracks price changes relative to a base year
CPI is the UK's main measure and is used by the Bank of England for its 2% inflation target.
CPIH: includes owner-occupier housing costs (a significant expense CPI misses).
RPI (Retail Price Index): an older measure, includes mortgage interest payments. Tends to be higher than CPI. Still used for some index-linked payments but considered less reliable (not a National Statistic since 2013).
Limitations of CPI
- The basket is updated annually but may not reflect individual spending patterns
- Does not fully capture quality improvements (a laptop today is far more powerful than one a decade ago)
- Substitution bias: consumers switch to cheaper alternatives when prices rise, but the basket does not immediately adjust
- New products may be slow to enter the basket
- Regional price variations are not captured
- Housing costs (in CPI) are excluded — CPIH addresses this partly
Unemployment
Unemployment: people who are of working age, without a job, actively seeking work, and available to start within two weeks.
Measurement
Claimant Count: number of people claiming Jobseeker's Allowance or the unemployment element of Universal Credit.
- Simple to collect, available monthly
- But: not all unemployed claim (stigma, ineligibility); some claimants may not be genuinely seeking work; policy changes (tightening eligibility) reduce the count without reducing actual unemployment
Labour Force Survey (IFS/LFS): quarterly survey of ~40,000 households using the ILO definition.
- Internationally comparable
- Captures those not claiming benefits
- But: sample-based (sampling error), costly, people may misreport, does not capture underemployment (working fewer hours than desired) or hidden unemployment (economically inactive who would work if conditions improved)
Key Rates
- Unemployment rate = (unemployed ÷ economically active) × 100
- Economic inactivity rate: those of working age not in work and not seeking it (students, carers, long-term sick, retired early)
- Employment rate: proportion of working-age population in employment
Balance of Payments
The balance of payments records all financial transactions between a country's residents and the rest of the world over a period.
Structure
| Account | Contents |
|---|---|
| Current account | Trade in goods (visible), trade in services (invisible), primary income (investment income, wages), secondary income (transfers, aid) |
| Capital account | Capital transfers (debt forgiveness, migrant transfers), non-produced assets (patents, copyrights) |
| Financial account | FDI, portfolio investment, reserve assets, other investment |
The current account balance is the most commonly discussed. The UK has run a persistent current account deficit since the 1980s (importing more than exporting).
Significance
- A current account deficit means the country is a net borrower from abroad — financed by the financial account (foreign investment inflows)
- Persistent deficits may indicate uncompetitiveness, excessive consumption, or overvalued currency
- But deficits may also reflect strong FDI inflows (foreigners investing in a growing economy)
- A deficit is not inherently "bad" — it depends on the cause and whether it is sustainable
Macroeconomic Objectives and Conflicts
| Objective | Target/Indicator |
|---|---|
| Economic growth | Sustained rise in real GDP |
| Low inflation | CPI at 2% (±1%) |
| Low unemployment | High employment rate |
| BoP equilibrium | Sustainable current account |
| Sound government finances | Manageable debt and deficit |
| Environmental sustainability | Reducing carbon emissions |
| Reducing inequality | Narrowing income/wealth gaps |
Conflicts Between Objectives
- Growth vs inflation: rapid growth may cause demand-pull inflation
- Growth vs environment: higher output may increase pollution and resource depletion
- Low unemployment vs inflation: the Phillips curve trade-off (short-run)
- Growth vs current account: growth sucks in imports, worsening the deficit
- Reducing inequality vs incentives: redistribution may reduce work/investment incentives
These conflicts mean policymakers face trade-offs and must prioritise.
Exam Technique
- Always specify which measure you are discussing (CPI vs RPI, claimant count vs LFS)
- Discuss limitations of each indicator — examiners reward critical analysis
- Use real vs nominal GDP consistently
- In essays on economic performance, consider multiple indicators (GDP + inequality + environment) rather than GDP alone
- Apply to UK data where possible — reference current figures or trends