Understanding Cost-Push Inflation and Economic Drivers

Understanding Cost-Push Inflation

The law of diminishing marginal returns to labor suggests that increasing production often involves hiring less-skilled workers and utilizing older, less-efficient equipment, which contributes to increasing marginal costs.

Key Drivers of Inflation

• Higher profit margins: If firms believe market conditions have improved sufficiently to increase mark-ups, the economy may experience profit-push inflation.
• Wage inflation: Every increase in money-wage rates not offset by productivity improvements will raise unit labor costs.

Defining Cost-Push Inflation

Cost-push inflation, also called supply shock inflation, is caused by a drop in aggregate supply (potential output). This may be due to natural disasters or increased prices of inputs. For example, a sudden increase in oil prices can cause cost-push inflation. Thus, it is a catch-all term that captures a wide range of factors, such as:

• Increases in energy costs (e.g., oil and natural gas).
• Increases in the prices of imported final goods and inputs.
• Increases in money wages resulting from the bargaining power of workers.
• Increases in profit margins.

Two Perspectives on Inflation

Perspective 1: Transient Shocks

Some argue that the sources of cost-push inflation exhibit a low degree of persistence and are modeled as a symmetric random variable of zero mean, which assumes that supply shocks of opposite signs cancel each other out in the long run.

Perspective 2: Structural Persistence

Cost-push inflation should be taken seriously as it can render monetary policy an ineffective tool. Some macroeconomists argue that inflation in OECD economies is primarily cost-push, resulting from conflicts among different groups of workers (wage spiral) and between workers and employers (wage-price spiral). These conflicts are not captured by symmetric random variables due to their high degree of persistence or inertia.

Policy Implications

Wage-setting in large portions of the labor market is often dominated by historical and institutional factors, making it insensitive to labor market slack. When inflation is loosely connected to aggregate demand, monetary policy becomes an ineffective tool. In such circumstances, it is more appropriate to use other instruments, such as an incomes policy, to ensure that money wages grow at a pace consistent with labor productivity growth.