Wholesale Price Index (WPI) measures the average change in the prices of commodities for bulk sale at the level of early stage of transactions. The index basket of the WPI covers commodities falling under the three major groups namely Primary Articles, Fuel and Power and Manufactured products. (The index basket of the present 2011-12 series has a total of 697items including 117 items for Primary Articles, 16 items for Fuel & Power and 564 items for Manufactured Products.)

Source: ForumIAS