The Producer Price Index

The Producer Price Index, or PPI, is a family of indexes that tracks changes in prices received by domestic producers over time. It compares current prices to base-year prices, weighted by each item's importance in production. PPI reflects cost movements at the production level, even before goods reach consumers.

Unlike CPI, which measures retail prices for consumers, PPI tracks production costs for producers.

For example, if steel prices rise, car manufacturers may soon face higher input costs. This increase appears in the PPI before it trickles down to consumers through higher car prices.

The PPI includes separate indexes for various stages of production, such as raw materials, intermediate goods, and final products. This layered approach helps identify where price pressures are building within the supply chain.

The index's specific structure and coverage vary across countries, depending on how production data is collected and reported.

Businesses use PPI data to adjust prices in long-term contracts, helping them manage cost changes over time. However, the index usually excludes imports and may underrepresent services.