Core Inflation
Plain definition
Core inflation is a measure of underlying inflation that excludes the volatile food and energy components from the price index. By stripping out the noisiest prices, it reveals the persistent trend in the general price level.
In economics
Central banks focus on core inflation when setting interest rates because food and energy prices swing with weather, geopolitics, and speculation — factors monetary policy cannot control and should not chase. The Fed's preferred gauge is core PCE inflation, targeting 2%. Critics note that excluding food and energy ignores the prices households feel most, but for policy, the trend matters more than the noise.
Example
In 2022, headline U.S. inflation topped 9% on surging gas and food prices, while core inflation was lower at about 6%. The Fed raised rates aggressively based on core's signal that underlying price pressure was broad — and core's slower decline in 2023 confirmed inflation was stickier than energy prices alone suggested.
Core inflation is often misread as 'inflation excluding things people buy.' Food and energy are excluded not because they don't matter, but because their volatility obscures the trend — policymakers still watch headline inflation too. Core is a policy tool for judging persistent pressure, not a claim that groceries and gas are unimportant.