Core inflation is the rate of price increase excluding volatile food and energy prices. It reveals underlying price pressures by filtering out temporary commodity shocks.
Why Exclude Food and Energy?
Food and energy prices fluctuate for reasons unrelated to monetary conditions:
- Hurricane damages Gulf refineries → oil prices spike
- Drought reduces crop yields → food prices spike
- OPEC production decisions → energy prices shift
These spikes are temporary and don't reflect persistent inflation driven by central bank policy.
The Difference
In 2022:
- Headline inflation: 8% (including oil/food spikes)
- Core inflation: 6% (excluding volatiles)
The 2% gap represented temporary commodity shocks, not underlying inflation.
Central Bank Focus
The Federal Reserve targets 2% core inflation, not headline CPI. When the Fed says "inflation is above target," they mean core inflation, which better reflects the sustainable trend.
Investor Implications
If headline CPI spikes 4% but core CPI is 2.5%, the difference suggests temporary commodity pressure. The Fed likely won't raise rates aggressively because underlying inflation (core) is moderate.
Conversely, if core inflation rises above 3%, the Fed will tighten policy because it signals persistent price pressures.
