Macroeconomic Indicators: GDP, Inflation and Unemployment

What are macroeconomic indicators?

Macro means big. Macroeconomics looks at the whole economy, not one shop or one family. An indicator is a number that tells us how things are going, like a thermometer.

Most governments have four main aims, and each has an indicator:

• Economic growth → real GDP growth rate.
• Stable prices → inflation rate (often a target near 2–4%).
• Full employment → unemployment rate.
• A sound position with other countries → current account balance of the balance of payments.

GDP: measuring output

Gross Domestic Product (GDP) is the total market value of all final goods and services produced inside a country in one year. We count only final goods so we do not count the same flour twice (once as flour, once in bread).

Nominal vs real GDP

Nominal GDP uses today's prices. It can rise just because prices rise. Real GDP uses the prices of a fixed base year, so it shows only changes in the amount produced.

Real GDP = Nominal GDP ÷ (price index ÷ 100). Quick rule: real growth ≈ nominal growth − inflation.

GDP per head

GDP ÷ population tells us the average output per person. A big country may have a large GDP but a small GDP per head. To compare countries fairly, economists often use purchasing power parity (PPP), which adjusts for different price levels.

Limitations of GDP

GDP is useful, but it misses a lot:

• Unpaid work like cooking at home or caring for grandparents is not counted.
• The informal (hidden) economy: cash jobs not recorded.
• Inequality: an average hides whether a few people get most of the income.
• Quality of life: leisure time, health, safety and happiness are not measured.
• Environment: pollution and using up forests can raise GDP while making life worse.
• Quality changes: a phone today does far more than one at the same price years ago.

That is why people also look at the Human Development Index (HDI), measures of well-being and green GDP.

Inflation: how it is measured and why it hurts

Inflation is a steady rise in the general price level. It means each unit of money buys less.

Measuring it: the price index

1. Pick a basket of goods a typical family buys (food, rent, transport, school fees...).
2. Give each item a weight by how much is spent on it.
3. Find the basket's cost in the base year (index = 100) and now.
4. Inflation rate = (new index − old index) ÷ old index × 100.

This is the Consumer Price Index (CPI). A fall in prices is deflation; prices still rising but more slowly is disinflation.

Costs of inflation

• People on fixed incomes and savers lose buying power.
• Uncertainty: firms delay investment when they cannot plan prices.
• Menu costs (changing price lists) and shoe-leather costs (more trips to the bank).
• Exports become less competitive if prices rise faster than abroad.
• Borrowers gain and lenders lose when inflation is higher than expected.

Unemployment: who counts and why it matters

A person is unemployed if they have no job, are able to work and are actively looking. Students and retired people who are not looking are not in the labour force.

Labour force = employed + unemployed. Unemployment rate = unemployed ÷ labour force × 100.

Types of unemployment

• Frictional: short gaps while moving between jobs.
• Structural: skills or location do not match the jobs (e.g. a factory closes, new jobs need computer skills).
• Cyclical (demand-deficient): caused by a recession.
• Seasonal: work only in some seasons, like farming or tourism.

When only frictional and structural unemployment remain, economists call it the natural rate. Costs: lost output, lost income and skills, more government spending on support, and stress for families. Some people are underemployed: they work fewer hours or at a lower skill level than they want.

Current account and the business cycle

The current account records money from trade in goods and services plus incomes and transfers with the rest of the world. Exports bigger than imports → surplus; smaller → deficit.

The business cycle

Real GDP does not grow smoothly. It moves around a long-run trend:

• Expansion (boom): output rises, unemployment falls, inflation may rise.
• Peak: the top; the economy may overheat.
• Recession: real GDP falls (often defined as two quarters in a row), unemployment rises.
• Trough: the bottom, before recovery.

The gap between actual and potential output is the output gap. Governments use fiscal policy (taxes and spending) and central banks use monetary policy (interest rates) to smooth the cycle.

Try it: build your own price index

Write down the prices of 5 things your family buys every week (milk 1 L, bread, rice 1 kg, a bus ticket, a notebook). Keep the list. In three months check again. Add up both totals and work out (new − old) ÷ old × 100. That is your family's own inflation rate. Then try step 6 of the 3D: set nominal growth to 6% and inflation to 6%. What happens to real growth?

Key formulas and definitions

• Real GDP = Nominal GDP ÷ (Price index ÷ 100)
• Real growth ≈ nominal growth − inflation
• GDP per head = GDP ÷ population
• Inflation rate = (new index − old index) ÷ old index × 100
• Unemployment rate = unemployed ÷ labour force × 100; labour force = employed + unemployed
• Current account balance = exports − imports (goods and services) + net income + net transfers

Worked examples

Common mistakes

• Comparing nominal GDP across years. Always remove inflation and use real GDP.
• Thinking inflation means all prices rise by the same amount. It is the average change of a weighted basket.
• Counting students or retired people as unemployed. Only people actively looking for work are unemployed.
• Saying deflation is just 'low inflation'. Deflation means prices actually fall; low inflation means they rise slowly.