India Launches Producer Price Index to Replace WPI Over Five Years

India has taken a monumental step in modernising its economic monitoring by releasing its first-ever Producer Price Index (PPI) data. This strategic shift marks the beginning of a five-year transition period to phase out the long-standing Wholesale Price Index (WPI) in favour of a more comprehensive measurement of inflation.

A Strategic Shift Towards Global Standards

The transition from WPI to PPI aligns India with the methodologies used by advanced economies and follows key recommendations from the International Monetary Fund (IMF). Unlike the WPI, which measures prices at the wholesale level, the PPI provides a more granular view of price changes from the producer's perspective.

This change is crucial for more accurate National Accounts and GDP compilation. By distinguishing between "Output PPI" (the price of goods and services produced) and "Input PPI" (the cost of raw materials and inputs used), the government can now better track how rising input costs are passed through to the final output.

The Commerce and Industry Ministry released the initial data alongside the May wholesale inflation figures. During this period, wholesale inflation climbed to 9.68% from 8.26% in April. Correspondingly, the Output PPI inflation also saw an upward trend, rising to 9.4% in May from 8.1% in April.

Key figures from the first release include:

  • All-India Output PPI (All Commodities): Stood at 109.6 in May 2026, up from 108.6 in April.
  • All-India Trial Input PPI (Manufacturing Sector): Recorded at 104.9 for May 2026.

The Ministry is currently publishing the Input PPI on an experimental basis to ensure data quality and gather stakeholder feedback before full-scale implementation.

Structural Differences and Sectoral Weightage

The new PPI framework utilizes a revised base year of 2022-23, covering 957 items. The structural composition of the Output PPI (Goods) differs significantly from the old WPI, reflecting a modern economy:

  • Manufactured Items: Carry a dominant weight of 69.93% in the Output PPI, compared to 63.12% in the WPI.
  • Agriculture, Forestry, and Fishing: Account for 22.16% of the weight.
  • Electricity and Mining: Contribute 4.49% and 3.42%, respectively.

対照的に、WPIは一次産品（22.76%）および燃料・動力（14.11%）に対して、より高い比重を置いていました。

サービスPPI統合へのロードマップ

サービスPPIの導入は、段階的に実施されます。第一段階では、銀行、証券取引、保険、年金基金管理、鉄道、航空旅客輸送、通信サービスなどの重要セクターに焦点を当てます。

その後の段階では、価格調査とGSTN（Goods and Services Tax Network）から統合されたデータを用いて、残りのサービスセクターへと範囲を拡大していきます。この段階的なアプローチにより、移行が強固でデータに基づいたものとなることが保証されます。

主な要点

  • 段階的な移行: 卸売物価指数（WPI）は、5年間にわたって段階的に廃止され、生産者物価指数（PPI）に置き換えられます。
  • 経済的洞察の強化: 投入PPIと産出PPIの両方を導入することで、政策立案者は生産コストの上昇が最終財やサービスにどのような影響を与えるかを把握できるようになります。
  • グローバルな整合性: この動きはIMFの勧告に従ったものであり、近代化された2022-23年を基準年として使用することで、GDPおよび国民経済計算の作成において、より正確なデータを提供します。