Come June 15, India will change the way it measures inflation at the producer level. The government has announced the launch of the Producer Price Index (PPI), beginning a five-year transition away from the Wholesale Price Index (WPI). This is more than a statistical update; it is a fundamental rethink of how India measures the cost of producing goods and services.
The PPI tracks price changes from the producer’s perspective and covers both goods and services. It measures what producers receive for their output and what they pay for inputs. In essence, it captures inflation at the point where economic activity begins, before products move through supply chains and reach consumers.
The distinction between output and input PPI is important. The former is based on prices received by producers—basic prices—that exclude net taxes as well as trade and transport margins. The latter, by contrast, is based on purchasers’ prices, which include these margins and reflect what producers actually pay for inputs. Together, the two indices provide a clearer picture of how inflation emerges and moves through the economy.
Most countries have already replaced WPI with PPI because it is conceptually aligned with the internationally accepted System of National Accounts, the framework used to measure GDP and economic activity. India’s adoption of PPI is therefore a long-overdue alignment.
At first glance, WPI and output PPI appear similar because both rely on producer prices. Their differences, however, are structural. WPI weights are based on the gross value of output estimates from the national accounts at a broad sector level. Output PPI uses the supply table of the national accounts, offering a more granular and up-to-date representation of economic activity.
The more significant difference lies in coverage. WPI measures only goods, whereas PPI includes both goods and services. This matters because services now contribute more than 55 percent of India’s GDP and employ nearly 30 percent of its workforce. Excluding such a large segment of the economy has increasingly made WPI an incomplete measure of producer inflation.
PPI also addresses a technical weakness in WPI. Intermediate goods were often counted multiple times as they moved through different stages of production, creating distortions through double counting. By releasing both input and output PPIs, the new framework provides a cleaner and more accurate view of where inflation originates and how it spreads.
For businesses, PPI offers a forward-looking indicator. The availability of both input and output measures makes it easier to track how cost pressures are transmitted through production chains. If a steel producer faces rising input costs, those pressures are likely to flow downstream to automobile manufacturers, construction firms and appliance makers. PPI helps identify such transmission mechanisms much earlier than consumer inflation data.
The index also has practical implications for contracts. Many long-term infrastructure, construction and supply agreements contain price-escalation clauses that adjust payments for inflation. Given the widespread use of WPI in such contracts, the government will continue publishing a revised WPI alongside PPI for five years before phasing it out completely. This transition period should allow businesses sufficient time to renegotiate agreements and adopt the new benchmark.
Beyond contractual pricing, input PPI can serve as an early warning system. When costs rise sharply in sectors such as pharmaceuticals, automobiles or construction, the impact often takes weeks or months to appear in retail prices. Firms that monitor input PPI can anticipate margin pressures, adjust pricing strategies, hedge exposures or renegotiate supplier agreements before profitability is affected. Investors can also use these signals to identify sectors where earnings may come under pressure.
Producer inflation rarely remains confined to factory gates. Rising costs are eventually passed on through supply chains and reflected in consumer prices. PPI therefore serves as a leading indicator of movements in the consumer price index. If input PPI is rising while output PPI remains subdued, the gap often represents a temporary absorption of costs that is unlikely to persist indefinitely.
The implications extend to policymaking as well. The RBI relies on inflation indicators to calibrate monetary policy. An index that excludes services and contains distortions from double-counting provides an incomplete picture of inflationary pressures. By broadening coverage and improving measurement, PPI offers policymakers a sharper tool for assessing emerging price trends.
The transition, however, is not without challenges. Services PPI will initially be published quarterly rather than monthly, creating an asymmetry with goods data. In an economy where services dominate output, this lag may temporarily limit the index’s usefulness as a real-time inflation gauge. Policymakers should view quarterly publication as a starting point rather than a permanent arrangement.
The revised basket itself reflects a changing economy. The number of commodities has increased from 697 to 957, with newer sectors such as solar, wind and nuclear electricity now included. Yet the credibility of any index ultimately depends less on its design than on the quality of the underlying data. Reliable price collection across a vast and diverse economy remains the more demanding task.
India’s move to PPI is both overdue and necessary. Importantly, it shifts attention to where inflation actually begins. An economy that measures itself more accurately is better equipped to govern itself more effectively.
Tulsi Jayakumar | Professor, economics & policy; and Executive Director, Centre for Family Business & Entrepreneurship, Bhavan’s SPJIMR
(Views are personal)
