Producer Price Index - Commodities: The Producer Price Index is a family of indexes that measures the average change over time in the selling prices received by domestic producers of goods and services. PPI's measure price change from the perspective of the seller. Over 10,000 PPI's for individual products and groups of products are released each month. PPI's are available for the products of virtually every industry in the mining and manufacturing sectors of the U.S. economy, and new PPI's are being introduced for the products of industries in the transportation, utilities, trade, finance, and services sectors of the economy. The PC database includes current indexes by industry, the PD database contains discontinued indexes by industry, and the WP database holds indexes by commodity.