WPI

Full form: Wholesale Price Index

Investments

WPI measures inflation at the wholesale (producer) level -- the prices at which goods are sold in bulk before reaching consumers. Unlike CPI (consumer prices), WPI tracks prices at factory gate, farm gate, and industrial output levels. WPI inflation typically leads CPI inflation by 2-4 months.

In detail

WPI vs CPI differences:nWPI: wholesale/producer prices, doesn't include servicesnCPI: retail/consumer prices, includes servicesnBoth important but RBI uses CPI for monetary policynnWPI components:nPrimary articles (food, non-food): 22.6%nFuel and power: 13.2%nManufactured products: 64.2% (largest)nnFor equity investors: rising WPI for manufactured goods suggests increasing corporate input costs, which may compress margins (negative for manufacturing stocks). Rising WPI before rising CPI signals incoming consumer inflation.

Formula

WPI = (Current wholesale price / Base year price) x 100nWPI-based inflation = (WPI current - WPI previous year) / WPI previous year x 100

Real-life example

🇮🇳 India example

WPI for steel rose 30% in 2021 (global commodity cycle). Auto companies saw rising input costs -- compressed margins -- falling stock prices. Investors who tracked WPI trends avoided auto stocks in this period. CPI only reflected this steel price surge 3-4 months later in vehicle prices.

Frequently asked questions

Which inflation measure should I track as an investor? ▼

CPI for your own financial planning (impacts RBI rates, your real purchasing power). WPI for equity investing clues (sector-level input cost trends). Both are released monthly by government -- CPI on 12th, WPI on 14th of the following month.