The Consumer Price Index (CPI) is one of the most cited inflation measures in the United States. It is produced by the Bureau of Labor Statistics and helps quantify how quickly prices are changing.
What CPI Measures
CPI tracks price movement across major categories including:
- Housing
- Food
- Transportation
- Medical care
- Education
- Recreation
The index compares current prices to a base period and reports both monthly and annual change rates.
Why CPI Matters for Cost of Living Analysis
If wages rise slower than CPI, households lose purchasing power. If wages rise faster than CPI, real income improves. That is why CPI should always be paired with wage growth metrics.
CPI vs Local Cost Indexes
CPI is broad and national, while local cost-of-living indexes are city-specific and designed for relocation decisions. CPI helps with macro trends; local indexes help with move planning.
Limitations
CPI uses a representative basket and cannot perfectly reflect every household. A renter-heavy household and a homeowner household can experience inflation very differently.