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The announced a phased transition from the Wholesale Price Index () to a Producer Price Index () over the next five years. The new series, which introduces 2022-23 as the base year replacing 2011-12, will run concurrently with the until it is discontinued. This reform aligns India's inflation measurement with global best practices recommended by the ().
This transition is a significant reform in macroeconomic data collection. The fundamental difference between WPI and PPI lies in their scope and pricing point. WPI measures the change in prices of goods sold in bulk by wholesale businesses, often including taxes and transport margins. Conversely, PPI tracks the average change in selling prices received by domestic producers for their output, usually measured at basic prices (excluding net taxes, trade, and transport margins). By excluding these indirect taxes, PPI provides a cleaner measure of actual production costs and pricing power. Furthermore, the introduction of a Services PPI is crucial. The current WPI entirely excludes services, which constitute over 50% of India's GDP. Adding services to the PPI basket provides a much more accurate reflection of the modern Indian economy.
The introduction of Input and Output PPIs will enhance the precision of national income accounting, specifically Gross Domestic Product (GDP) estimation. Currently, GDP is calculated nominally and then adjusted for inflation using price indices (deflators) to arrive at real GDP. The availability of both input and output PPIs allows for a methodology known as double deflation. Double deflation involves deflating the value of gross output and the value of intermediate inputs separately, leading to a more accurate calculation of Gross Value Added (GVA). This addresses long-standing criticisms regarding the overestimation or underestimation of manufacturing growth in India due to single deflation methods relying primarily on the WPI. The transition process, involving a five-year concurrent run, demonstrates prudent administrative planning to allow industries, especially those using WPI in price escalation clauses in contracts, adequate time to adjust.
The revised WPI basket, with its updated 2022-23 base year, reflects changes in India's energy landscape. The expansion of the basket from 697 to 957 items includes the addition of new energy sources like solar and wind power under the electricity group. Furthermore, nuclear electricity has also been incorporated. This shift acknowledges the growing contribution of renewable energy to the national grid and the economy. Reclassifying crude petroleum and natural gas from 'primary articles' to 'fuel and power' improves statistical alignment, grouping major energy sources together. While this is primarily a statistical reclassification, it underscores the structural shift occurring in the Indian economy towards cleaner energy sources and the necessity for macroeconomic indices to capture this transition accurately.