Describe the phases of the business cycle and explain how fluctuations in economic activity affect growth, unemployment and inflation in Australia.

What this dot point is asking

Economies do not grow at a steady, smooth rate. Around their long-term upward trend, real Gross Domestic Product fluctuates in a pattern called the business cycle. Understanding the cycle explains why unemployment and inflation move in opposite directions over time and why governments use fiscal and monetary policy to smooth it.

The phases of the cycle

The business cycle has four phases that repeat irregularly.

• Expansion (recovery and boom): real GDP is rising, firms hire, unemployment falls and confidence improves. Late in a strong expansion, spending presses against capacity and inflation starts to build.
• Peak: activity reaches its highest point. Resources are stretched, unemployment is at its lowest and inflationary pressure is greatest.
• Contraction (slowdown and recession): real GDP growth slows and then falls. Firms cut output and shed workers, so unemployment rises and inflation eases.
• Trough: the low point, where activity bottoms out before the next recovery begins.

A common rule of thumb defines a technical recession as two consecutive quarters of falling real GDP, though the full picture also weighs the unemployment rate and other indicators.

The cycle versus the trend

It is important to separate the short-run cycle from the long-run trend. The trend is the economy's average growth rate over many years, driven by growth in the labour force, the capital stock and productivity. The cycle is the deviation around that trend. Australia's trend growth is often cited at around 2.5 to 3 per cent a year, while actual growth in any quarter can be well above or below that line.

How the cycle affects key indicators

During an expansion, rising spending lifts demand for labour, so unemployment falls toward or below the NAIRU. As the economy nears capacity, demand-pull inflation builds. During a contraction, falling demand means firms produce and hire less, so unemployment rises while inflation eases. This inverse short-run relationship between unemployment and inflation is the Phillips curve trade-off that policymakers must manage.

Causes and management

Cycles arise from swings in spending, especially volatile components such as business investment and net exports, as well as confidence, credit conditions and external shocks. Australia's cycle is heavily influenced by global conditions and commodity prices because we are a small, open, resource-exporting economy. Governments aim to dampen the cycle: contractionary policy (a tighter budget or higher cash rate) cools an overheating boom, while expansionary policy (stimulus or rate cuts) supports activity in a downturn.

A strong answer names the phase from the indicators, links it to unemployment and inflation, and explains how policymakers would respond to push the economy back toward its trend.