The Producer Price Index (PPI) is a family of indexes that measures the average change over time in the selling prices received by domestic producers of goods and services. It is a measure of inflation at the wholesale level and is compiled from thousands of indexes measuring producer prices by industry and product category. The PPI is different from the Consumer Price Index (CPI), which measures the changes in the price of goods and services paid by consumers. The PPI system encompasses the production of all industries in the sectors involved in manufacturing goods, including mining, manufacturing, agriculture, fishing, forestry, gas, electricity, waste, and scrap materials. The PPI is determined by taking the average weighted prices of goods and services produced in the U.S. for over 10,000 PPIs for individual products and groups of products that are released each month. The PPI is calculated based on products and services, industries, and the buyers economic identity, which are used to calculate the overall monthly change in final demand PPI.