Measurement of Employment and Inflation
This domain tests definitions and measurement, not just trends. You must distinguish unemployment from inactivity, calculate rates correctly, explain what the CPI does and does not include, and evaluate the limitations of official statistics.
Core rules and concepts
- ILO/LFS unemployment: without work, available to start within two weeks, and actively seeking work in the past four weeks. The claimant count measures those eligible for unemployment benefits.
- Unemployment rate = unemployed ÷ labour force × 100. Labour force = employed + unemployed. The participation rate = labour force ÷ working-age population × 100.
- Types include frictional, structural, seasonal, cyclical (demand-deficient) and real-wage unemployment. The natural rate is the rate consistent with stable inflation.
- CPI is a weighted average of price changes for a representative basket. Weights reflect household spending and are updated periodically. CPI usually excludes mortgage interest payments; RPI includes some housing costs; core inflation excludes food and energy.
- Real values adjust for inflation: real interest rate ≈ nominal rate − inflation rate. Real income = nominal income ÷ price index × 100.
- Limitations include substitution bias, quality change, basket representativeness, regional variation, exclusion of housing costs and the informal economy.
Worked example
The labour force is 32 million and unemployment is 2.5 million. The unemployment rate is 2.5 ÷ 32 × 100 = 7.8%. If 1.2 million unemployed people become discouraged and stop seeking work, they leave the labour force. Measured unemployment becomes 1.3 ÷ 30.8 × 100 = 4.2%, even though nobody has gained a job. This illustrates why falling unemployment can reflect falling participation rather than improved labour demand.
For inflation, suppose basket weights are food 20%, housing 30%, transport 15% and other goods 35%, with price changes of +4%, +6%, −2% and +3%. The weighted inflation rate is (0.20 × 4) + (0.30 × 6) + (0.15 × −2) + (0.35 × 3) = 0.8 + 1.8 − 0.3 + 1.05 = 3.35%.
Traps that cost marks
- Including retired people or children in the labour force.
- Treating discouraged workers as unemployed rather than inactive.
- Saying CPI includes mortgage interest payments.
- Confusing a rise in the price level with a change in the inflation rate.
- Using nominal rather than real values when comparing over time.