Causes of Inflation: Demand-Pull, Cost-Push and Built-In

The Three Main Causes of Inflation

Inflation — the sustained rise in the general price level — does not have a single cause. Economists identify three primary mechanisms through which inflation arises, each with different implications for economic policy.

1. Demand-Pull Inflation

Demand-pull inflation occurs when aggregate demand in an economy grows faster than aggregate supply. When consumers, businesses, and governments collectively attempt to buy more goods and services than the economy can produce, prices are bid upward.

Common triggers of demand-pull inflation include:

• Rapid economic growth increasing consumer and business spending
• Government deficit spending stimulating aggregate demand
• Expansionary monetary policy (low interest rates, quantitative easing) increasing money supply
• Rising consumer confidence and wealth effects
• Export booms increasing foreign demand for domestic goods

The classic description is "too much money chasing too few goods." During periods of very low unemployment, workers have stronger bargaining power for wage increases, which further fuels demand.

2. Cost-Push Inflation

Cost-push inflation arises from the supply side of the economy. When production costs rise for businesses — raw materials, energy, wages, or imported inputs — firms pass these higher costs on to consumers through higher prices.

Major triggers of cost-push inflation:

• Rising energy and commodity prices: Oil price shocks (1973, 1979, 2022) are classic examples
• Currency depreciation: A weaker exchange rate makes imports more expensive
• Rising labor costs: Wage increases not matched by productivity gains
• Supply chain disruptions: Pandemic-related shortages (2020–2022) are a recent example
• Natural disasters reducing agricultural or industrial supply

Cost-push inflation is particularly challenging for policymakers because conventional tools (raising interest rates) reduce demand but do not address supply-side cost pressures.

3. Built-In (Wage-Price Spiral) Inflation

Built-in inflation, also called the wage-price spiral, is a self-reinforcing cycle of inflation expectations. Workers, experiencing rising prices, demand higher wages to maintain their real income. Businesses facing higher wage bills raise prices to protect their margins. This in turn prompts further wage demands — creating a self-sustaining inflationary spiral.

Inflation expectations are a critical variable. Central banks work hard to anchor inflation expectations at their target (typically 2%) precisely because high expectations can become self-fulfilling.

Other Contributing Factors

Policy Responses

Understanding the cause of inflation is essential because the cure depends on the diagnosis:

• Demand-pull inflation: Raise interest rates, reduce government spending, increase taxes
• Cost-push inflation: Address supply constraints, reduce import tariffs, invest in energy independence
• Built-in inflation: Credible central bank commitment to inflation target, incomes policies