Macroeconomics
Inflation
Rising prices over time — multiple causes, important macroeconomic variable
Inflation is the sustained rise in the general price level over time. Reduces purchasing power of money. Measured by CPI (Consumer Price Index) or PCE (Personal Consumption Expenditures). Causes: (1) Demand-pull (too much money chasing too few goods). (2) Cost-push (rising input costs). (3) Built-in (wage-price spiral). Recent: post-COVID inflation 2021-2023 due to supply chain disruptions, stimulus, and energy costs. Hyperinflation: extreme inflation (>50%/month) — destabilizing. Deflation: falling prices, also problematic. Central banks: target ~2% inflation as stable.
- DefinitionSustained rise in general price level
- MeasureCPI (Consumer Price Index) most common
- CausesDemand-pull, cost-push, built-in
- HyperinflationExtreme inflation (>50%/month)
- DeflationFalling prices (also problematic)
- TargetMost central banks target ~2%
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Why inflation matters
- Monetary policy. Central bank decisions.
- Investment. Real returns.
- Wage negotiations. Inflation-adjusted wages.
- Pension planning. Future purchasing power.
- Government policy. Many programs adjust.
- Personal finance. Saving and borrowing.
- International comparison. Real economic comparisons.
Common misconceptions
- Inflation always bad. Mild inflation can stimulate.
- Money printing always inflates. Depends on velocity, demand.
- Inflation = price increase. Specifically sustained, general.
- Easy to predict. Surprises common.
- Same effect on everyone. Differential effects.
- Just monetary phenomenon. Many causes.
Frequently asked questions
What is inflation?
Sustained rise in general price level. Money buys less over time. $100 today: less than $100 a decade ago. Different from: price changes for specific goods (relative prices). Inflation: economy-wide. Measured by composite price indexes. Most economies experience some inflation continuously.
How is it measured?
Price indexes track average prices. CPI: most common. Computes weighted average price of consumer basket. PCE: alternative; includes wider goods. Wholesale price indexes: producer side. Each: methodology matters. Substitution effects, quality changes, new goods complicate measurement. Different indexes give somewhat different numbers.
What causes inflation?
Multiple sources. (1) Demand-pull: aggregate demand exceeds supply; too much money chasing too few goods. Stimulative monetary/fiscal policy can cause. (2) Cost-push: input costs rise (oil shocks, wages, supply disruptions). (3) Built-in: workers want raises to keep up with expected inflation; firms raise prices; cycle. (4) Money supply: long-run, money growth correlates with inflation. Real causes often combine.
What about hyperinflation?
Extreme inflation. >50% per month commonly used threshold. Examples. (1) Weimar Germany 1923: prices doubled hourly. (2) Zimbabwe 2008: 79.6 billion% per month. (3) Hungary 1946: 4.19 quintillion% per month — record. (4) Venezuela recent. Causes: typically extreme money printing to finance government. Devastating: erodes savings, disrupts contracts, social chaos.
What about deflation?
Negative inflation; falling prices. Less common but problematic. Issues. (1) Consumers delay purchases (cheaper later). (2) Real interest rates rise (bad for borrowers). (3) Wages sticky downward; layoffs. (4) Debt deflation: debts harder to pay. Examples: Great Depression, Japan since 1990. Central banks try to avoid. Mild deflation from productivity gains: less problematic.
How do central banks fight it?
Monetary policy. Raise interest rates: makes borrowing expensive; slows demand. Reduce money supply. Open market operations: sell bonds; reduce reserves. Recent: Fed raised rates from 0.25% to 5.25% in 2022-2023 to fight inflation. Trade-off: higher rates → slower economy → potentially recession. Central bank credibility important.
How does it affect different groups?
Differently. (1) Borrowers: gain (repay with less valuable money). (2) Lenders: lose (receive less valuable money). (3) Fixed-income (pensions, bonds): lose without inflation adjustment. (4) Savers: lose if interest below inflation. (5) Asset holders (real estate, stocks): often gain. (6) Wage earners: lose if wages don't keep up. Distribution effects significant.