Inflation Rate
The inflation rate is the percentage change in the general price level of goods and services in an economy over a specified period — typically measured year-over-year — and in the United States it is most commonly tracked through the Consumer Price Index (CPI) and the Personal Consumption Expenditures (PCE) price index.
Inflation is a persistent, broad-based increase in prices across the economy, distinct from a one-time price shock in a single category. Economists distinguish between 'demand-pull' inflation (too much money chasing too few goods), 'cost-push' inflation (rising input costs that suppliers pass through to consumers), and 'built-in' or 'wage-price spiral' inflation (where workers demand higher wages because prices have risen, which then pushes prices higher still).
The Federal Reserve targets an average inflation rate of 2% — measured by the PCE price index — as a balance between the risks of deflation (falling prices, which can trigger economic stagnation as consumers defer purchases) and high inflation (which erodes purchasing power and distorts economic decision-making). For several decades before 2021, the U.S. economy ran consistently below this target, leading to fears of secular stagnation. Then the combination of COVID-19 fiscal stimulus, supply-chain disruptions, energy shocks, and a tight labor market drove inflation to a 40-year high of 9.1% (CPI) in June 2022.
Inflation is the silent destroyer of real returns. A 3% annual inflation rate cuts the purchasing power of money by roughly half in 24 years. For investors, this means nominal returns must exceed inflation to generate real wealth. Equities historically provide a long-run hedge against moderate inflation because companies can raise prices; TIPS (Treasury Inflation-Protected Securities) provide explicit inflation indexation; commodities and real estate also tend to appreciate during inflationary periods. Cash and fixed-rate bonds, by contrast, suffer in real terms when inflation is high.
Hyperinflation — inflation exceeding 50% per month — represents an extreme form that effectively destroys a currency's usefulness. While this has historically occurred in economies like Zimbabwe and Weimar Germany, the risk in the United States is considered extremely low given the Fed's credibility and the global reserve-currency status of the dollar. Maintaining that credibility is a central reason the Fed acted so aggressively to hike rates in 2022 despite the economic pain it imposed.