The Government has revised the base year of All-India Wholesale Price Index (WPI) from 2004-05 to 2011-12. The revision of the base year of the macroeconomic indicators is a regular exercise to capture structural changes in the economy and to improve the quality, coverage and representativeness of the indices. The base year revision of WPI has aligned the series with the base year of other macroeconomic indicators such as the Gross Domestic Product (GDP) and Index of Industrial Production (IIP). The new series of WPI has the following salient features and improvements over the old series:

• The revised basket of WPI and its weighting structure conform to the structure of economy in 2011-12.
• The number of items in the basket has increased from 676 to 697 and the number of price quotations has increased from 5482 to 8331.
• New series of WPI does not include indirect taxes. This is in consonance with international practices and will make the new WPI conceptually closer to Producer Price Index.
• A new “Food Index” is compiled to capture the inflation in food items.
• Seasonality of fruits and vegetables has been updated to account for more months as they are now available for longer duration.
• Item level aggregates for new WPI are compiled using Geometric Mean (GM) instead of Arithmetic Mean.

The Government has modernized the data collection methods by adopting international norms and global best practices such as submission of data online through web portals, use of computer assisted personal interviewing methods etc.

This was stated by Shri Arjun Ram Meghwal, Minister of State for Finance & Corporate Affairs in written reply to a question in Lok Sabha today.

Base year revision of wholesale price index aligns WPI with other macroeconomic series and updates methodology. Revision of the Wholesale Price Index base year aligns the index with other macroeconomic series and updates its methodology: the basket and weighting structure were revised, the item count and price quotations increased, indirect taxes were removed to approximate a Producer Price Index, a new Food Index was introduced, seasonality for fruits and vegetables was extended, item-level aggregation now uses Geometric Mean, and data collection was modernized with online submission and computer-assisted interviewing.