CPI vs WPI
How Consumer Price Index and Wholesale Price Index measure inflation differently — and why RBI tracks CPI, not WPI.
Start here
Consumer Price Index (CPI) is a retail inflation gauge tracking prices households pay for goods and services; Wholesale Price Index (WPI) is a producer-level index measuring bulk transaction prices before retail margins.
Imagine you buy atta, rent, and a doctor visit in the same month. CPI tries to capture that lived experience. WPI, on the other hand, asks what factories and mandis charged when goods left in bulk — before branding, transport, and retail margin.
UPSC loves this pair because students mix up who publishes each index, whether services count, and which one RBI uses after 2014.
Side-by-side comparison
| Feature | CPI | WPI |
|---|---|---|
| Published by | NSO (MoSPI) | Office of Economic Adviser (Commerce Ministry) |
| Largest weight | Food & beverages (~45%) | Manufactured products (~64%) |
| Price point | Final price paid by consumer | First bulk transaction price |
| Frequency | Monthly (CPI-Combined, Rural, Urban) | Monthly |
| Inflation type | Cost of living / consumer inflation | Producer / wholesale inflation |
| RBI policy link | Formal inflation target (4% ±2% on CPI-C) | Not the monetary policy anchor since 2014 |
At a glance
Level
Retail / household
Producer / wholesale
Services
Included
Not included (goods only)
Policy anchor
RBI inflation target (CPI-C)
Cost monitoring for industry
Base year
2012
2011-12
Why onion prices feel different from factory data
Suppose mandi onion prices crash (WPI falls) but retail still charges ₹40/kg because of transport and middlemen (CPI stays high). A student who only reads headlines on WPI might think inflation is cooling — while households still feel the pinch. That gap is exactly what examiners test.
What this means for the exam
WPI can fall while CPI remains sticky. Never assume both move together. Services appear only in CPI.
Understand the difference
Why RBI shifted to CPI
Until the Urjit Patel Committee (2014), WPI was the main inflation signal. RBI now targets CPI-Combined because it reflects the cost of living — including services like health, education, and housing — which matter to monetary policy transmission.
Prelims statement check
“WPI includes services such as telecom and banking.”
Incorrect — Services trap
WPI tracks goods only. Any statement adding services to WPI is wrong.
“RBI uses CPI-Combined for flexible inflation targeting.”
Correct — Policy anchor
Correct after the shift away from WPI-centric policy.
PYQ Linkage
(1) WPI only includes goods, not services. (2) CPI-Combined is used by RBI for inflation targeting. Which is/are correct?
Key Takeaway
CPI = household basket (goods + services) | WPI = factory/mandi goods only | RBI → CPI-C