Common Questions About Inflation & CPI

WPI (Wholesale Price Index) tracks prices at the wholesale level—what businesses pay for raw materials and goods before they reach consumers. CPI (Consumer Price Index) measures what you actually pay in shops and markets. The gap between them matters because WPI often moves first; if wholesale prices jump, retail prices usually follow in 2-4 months. For policymakers and businesses, WPI signals where inflation is headed.

India’s CPI basket includes about 1,000 items grouped into categories like food, fuel, housing, and services. The basket isn’t weighted equally—food alone accounts for roughly 46% of the CPI because Indian households spend a much larger share of income on groceries compared to developed countries. The Reserve Bank updates the basket periodically to reflect changing consumption patterns.

CPI uses a weighted average based on typical spending patterns, but your personal inflation depends on what you actually buy. If you spend more on fuel and electricity than the average household, you’ll feel inflation more acutely when energy prices spike. Also, CPI uses scientific data collection methods that sometimes lag real-world price movements you see in markets.

CPI data comes out monthly, usually in the first week of the following month. Look at the headline number (total inflation including food and fuel) for the big picture, but also check core inflation (excluding volatile food and fuel). A core inflation rate above 5-6% typically signals sticky price pressures that the RBI takes seriously.

Not directly—CPI is a lagging indicator that tells you what already happened. However, you can track CPI trends over 3-6 months to spot directions. Combine it with WPI data (which leads CPI) to get a better forward-looking picture. If WPI jumps significantly, it’s worth watching whether retail prices follow.

India switched its CPI base year from 2010 to 2012, and later calculations use 2012 as the reference point (where CPI = 100). When you see a CPI reading of 110, it means prices are 10% higher than the 2012 baseline. Different base years exist for historical reasons, so always check which base year is being used when comparing older data to current inflation.