Critically examine the limitations of WPI as a measure of inflation in India and how the proposed PPI addresses them.

The Wholesale Price Index, compiled by the Office of the Economic Adviser, DPIIT, measures producer-side price change but has long been faulted for an outdated basket and conceptual impurity. The approval of a revised WPI on base 2022-23 along with new Producer Price Indices, effective 15 June 2026 [1], makes this critique timely.

Limitations of WPI

• Representational lag: the basket rested on base 2011-12 (in force since May 2017), missing a decade of structural change; the revised series expands coverage and, notably, brings renewable energy into the fold [1].
• Conceptual impurity: WPI uses transaction prices inclusive of indirect taxes and trade margins, so tax changes distort the measured "price" signal rather than reflecting genuine cost pressure [1].
• Exclusion of services: WPI covers only goods — Primary Articles, Fuel & Power, Manufactured Products [2] — though services dominate India's GVA, making it a partial inflation gauge.
• Weak price collection, especially in manufacturing, was flagged as a core defect needing methodological overhaul [2].
• Limited policy weight: the RBI's Monetary Policy Committee targets CPI-Combined, leaving WPI informational [1].

How PPI addresses them

• PPI measures basic prices, excluding indirect taxes and subsidies, aligning India with the IMF PPI Manual and SNA 2008 and yielding a cleaner producer-cost signal [1][2].
• The new release includes Service PPI, closing the services gap.
• The Working Group under Dr. Ramesh Chand (NITI Aayog) built a roadmap for a phased WPI-to-PPI switch-over, with vetting by the TAC on Statistics of Price and Cost of Living and the NSC [1][2].
• Alignment with MoSPI's GDP base-year revision to 2022-23 [3] improves deflator consistency.

Yet PPI is no panacea: coverage of informal production and small services remains thin, and a parallel-run period is essential for continuity of contracts and wage indexation. A credible transition — sustained data investment, transparent weights, and synchronised base years across GDP, IIP, CPI and WPI — would make India's price statistics both internationally comparable and policy-ready.