WPI and PPI Explained: How India’s New Inflation Measures Affect Economic Data
India is changing how it measures price movements faced by producers, introducing new Producer Price Indices while modernising the Wholesale Price Index. The reform sounds technical, but it can improve how policymakers and businesses understand inflation. The Wholesale Price Index, or WPI, tracks changes in the prices of a selected basket of goods at the wholesale level. It covers primary articles, fuel and power, and manufactured products. India’s new WPI series uses 2022–23 as its base year. A base year provides the reference point against which later price changes are measured. Updating it helps the index reflect newer products, production patterns and their relative importance within the economy. The expanded series covers 957 items, compared with 697 in the earlier basket. Broader coverage should make the index more representative, although accuracy also depends on reliable price collection, transparent weights and appropriate revision procedures. A Producer Price Index, or PP...