What is Inflation?

Inflation measures how much more expensive a standard basket of goods and services has become over a given period. The Bureau of Labor Statistics (BLS) publishes the Consumer Price Index for All Urban Consumers (CPI-U) monthly, covering roughly 93% of the U.S. population. The index tracks prices across eight major categories: housing, transportation, food and beverages, medical care, education and communication, recreation, apparel, and other goods and services.

The Federal Reserve targets a 2% annual inflation rate, as measured by the Personal Consumption Expenditures (PCE) price index, judging that rate consistent with its dual mandate of maximum employment and stable prices. The BLS CPI-U often runs slightly higher than the PCE index due to methodological differences in how the baskets are constructed and weighted.

For households, even moderate inflation compounds significantly over decades. At 3% annual inflation, prices double roughly every 24 years. A retiree with fixed pension income loses half their purchasing power over that span unless the pension includes a cost-of-living adjustment (COLA). The SSA applies an annual COLA to Social Security benefits based on the CPI-W, protecting beneficiaries from some, though not necessarily all, inflation erosion.

From a macroeconomic perspective, inflation generally falls into two categories: demand-pull inflation, which occurs when aggregate demand outpaces supply, and cost-push inflation, driven by rising input costs such as wages and raw materials. To assess underlying trends without short-term noise, economists focus on 'core inflation,' which strips out volatile food and energy components. Managing inflation requires proactive asset allocation; because inflation erodes the value of cash and traditional fixed-income bonds, investors often hedge their portfolios with equities, real estate, commodities, and inflation-indexed securities like Treasury Inflation-Protected Securities (TIPS) and Series I Savings Bonds, which adjust their principal or yields to preserve purchasing power.