Explain the measurement of macroeconomic activity including real GDP, the Consumer Price Index and the unemployment rate, and the limitations of each measure

What this dot point is asking

QCAA wants you to define and measure real GDP, the CPI and the unemployment rate, identify the ABS data sources, explain the limitations, and apply the measures to current Australian conditions. Expect a short response in the EA.

The answer

Real GDP

Gross Domestic Product (GDP) is the total market value of all final goods and services produced within a country in a given period.

Real GDP adjusts nominal GDP for inflation, using a GDP deflator or chain-weighted price index.

The ABS publishes the National Accounts quarterly (cat. no. 5206.0).

Three approaches give the same answer:

1. Expenditure approach. GDP = C + I + G + (X - M).
2. Income approach. GDP = wages + profits + rents + indirect taxes (net of subsidies).
3. Production approach. Sum of value-added across all industries.

Recent Australian figures (ABS, indicative):

Limitations of GDP

GDP is the standard measure of economic activity but does not capture welfare comprehensively:

1. Excludes non-market activity. Household work, volunteering, the underground economy.
2. Excludes leisure. A society that works less but enjoys more leisure may be better off; GDP would fall.
3. Excludes environmental degradation. A forest cleared raises GDP; the lost ecosystem services are not deducted.
4. Says nothing about distribution. A country with high GDP and high inequality may have many poor citizens.
5. Counts spending that may not improve welfare. Defence spending, disaster recovery, prisons.

Real GDP per capita is a better measure of living standards because it controls for population growth. Australia's real GDP per capita grew slowly through 2023-24 (around 0 percent in some quarters) as population grew faster than total real GDP.

The OECD's "Better Life Index" and the UN's Human Development Index supplement GDP with other dimensions (health, education, environment, governance).

The Consumer Price Index

The CPI measures the cost of a fixed basket of goods and services typically bought by metropolitan households. The ABS publishes quarterly (cat. no. 6401.0).

Headline CPI is the year-on-year rate.

Trimmed mean CPI removes the top and bottom 15 percent of items by price change to give a cleaner signal of underlying inflation. The RBA's preferred measure.

Recent Australian figures:

Limitations of the CPI

1. Substitution bias. Consumers substitute away from goods that have become relatively more expensive; the fixed-basket CPI overstates inflation by missing this.
2. Quality change. New product features may not be fully accounted for. A modern phone is much more capable than a 2010 phone at similar inflation-adjusted price.
3. New goods. Products invented since the basket was constructed are missed.
4. Outlet substitution. The fixed-basket misses consumers' shift to discount retailers and online.
5. Excludes asset prices. Housing prices, equity prices are not in the CPI.
6. Single basket. Pensioners, renters, mortgage holders and high-income households have different spending patterns and experience different effective inflation rates.

The unemployment rate

Unemployment rate = number of unemployed people / labour force × 100.

Labour force = employed + unemployed.

To be counted as unemployed, a person must:

• Be aged 15 or over.
• Not be in paid work (or only incidental hours).
• Be actively seeking work in the past four weeks.
• Be available to start work.

The ABS publishes the Labour Force survey monthly (cat. no. 6202.0).

Recent Australian figures:

Limitations of the unemployment rate

1. Excludes discouraged workers. People who have stopped looking are not counted as unemployed. The "hidden unemployment" estimate adds 1 to 2 percentage points.
2. Excludes underemployment. Part-time workers wanting more hours are counted as employed. The underemployment rate (around 6 percent in 2024) captures this.
3. A single hour of work counts as employed. The ABS measure is "any paid work for at least one hour in the survey week".
4. Excludes long-term jobless who have left the labour force. They are not "unemployed" but may still want work.
5. No information on quality of jobs. Insecure, low-paid work counts the same as well-paid permanent work.

The underutilisation rate (unemployment plus underemployment) is around 10 percent in 2024 and gives a broader picture of spare capacity.

Other macroeconomic measures

Wage Price Index (ABS, cat. no. 6345.0). Quarterly. Controls for workforce composition. Around 4 percent y/y growth in 2024.

Balance of payments (ABS, cat. no. 5302.0). Quarterly. Current account, capital and financial account.

Participation rate. Labour force as a percentage of the working-age population. Around 67 percent in 2024.

Underemployment ratio. Workers wanting more hours / employed.

Real net national disposable income (NNDI) per capita. A better measure than real GDP because it includes the terms of trade and net foreign income flows.

Using the indicators together

The three core indicators (real GDP, CPI, unemployment) tell complementary stories:

• GDP tells you how much output is being produced.
• CPI tells you whether prices are stable.
• Unemployment tells you whether the labour market is at full employment.

The 2022 Australian episode showed all three moving together: strong GDP growth, falling unemployment, rising inflation. The 2024 disinflation episode showed the opposite: slower GDP growth, rising unemployment, falling inflation.

Common QCE traps

Confusing nominal with real GDP

Use real GDP for growth comparisons.

Treating CPI as a perfect measure

It has substitution bias, quality bias, and excludes asset prices.

Treating the unemployment rate as the only labour market measure

Underemployment, participation and the underutilisation rate also matter.

Forgetting per-capita measures

Real GDP per capita is a better welfare measure than total real GDP.