WPI, CPI, Core Inflation — Revision Notes

⚡ 30-Second Revision

WPI: 697 items, base 2011-12, manufactured goods 64.23%, excludes services
CPI: 299 items, base 2012, food & beverages 45.86%, includes services 28.32%
Core inflation: CPI minus food & fuel (52.7% of basket)
RBI shifted WPI→CPI targeting in 2016, target 4%±2%
Data sources: NSO (CPI), Office of Economic Adviser (WPI)
Key divergence factors: services exclusion in WPI, different food weightage
MPC uses core inflation to filter supply shocks from demand pressures

2-Minute Revision

India measures inflation through three indices: WPI (wholesale prices, 697 items, base 2011-12), CPI (consumer prices, 299 items, base 2012), and Core Inflation (CPI minus food & fuel). WPI emphasizes manufactured goods (64.

23%) and excludes services entirely. CPI includes food & beverages (45.86%) and services through miscellaneous category (28.32%). Core inflation excludes volatile food and fuel components (47.3% of CPI) to show underlying price trends.

RBI shifted from WPI to CPI-based inflation targeting in 2016 following Urjit Patel Committee recommendations because CPI better reflects consumer welfare and includes services. Current inflation target is 4% (±2%) based on CPI.

WPI-CPI divergence occurs due to different sectoral compositions, price collection levels (wholesale vs retail), and services exclusion in WPI. Core inflation helps Monetary Policy Committee distinguish between supply-driven temporary shocks and demand-driven persistent inflation requiring policy intervention.

5-Minute Revision

Inflation Measurement Framework: India uses WPI (wholesale), CPI (consumer), and Core Inflation for comprehensive price monitoring. WPI Structure: 697 items, base year 2011-12=100, compiled by Office of Economic Adviser.

Composition: Primary Articles 22.62% (food 15.26%), Fuel & Power 13.15%, Manufactured Products 64.23%. Excludes services completely. CPI Structure: 299 items, base year 2012=100, compiled by NSO. Composition: Food & Beverages 45.

86%, Housing 10.07%, Miscellaneous (services) 28.32%, Fuel & Light 6.84%, Clothing 6.53%, Pan/Tobacco 2.38%. Core Inflation: Excludes food & beverages and fuel & light from CPI, representing 52.7% of basket.

Filters volatile supply-side components. Policy Evolution: RBI shifted from WPI to CPI targeting in 2016 via MPC establishment. Reasons: consumer welfare focus, services inclusion, international alignment.

Current target: 4% ±2% based on CPI. Divergence Patterns: WPI-CPI often diverge due to: different sectoral weights, wholesale vs retail price levels, services exclusion in WPI, global commodity price impacts.

Monetary Policy Application: MPC analyzes core inflation to distinguish supply shocks from demand pressures. High core inflation indicates broad-based price pressures requiring policy response. Current Relevance: Post-COVID supply chain disruptions, food inflation volatility, global commodity price fluctuations create complex inflation dynamics requiring nuanced understanding of different measures.

Prelims Revision Notes

Key Numbers: WPI base 2011-12, CPI base 2012, Core excludes 47.3% of CPI. Weightage Patterns: WPI - Manufactured 64.23%, Primary 22.62%, Fuel 13.15%. CPI - Food 45.86%, Miscellaneous 28.32%, Housing 10.

07%, Fuel 6.84%. Data Sources: NSO compiles CPI, Office of Economic Adviser compiles WPI. Policy Framework: MPC established 2016, inflation target 4%±2% based on CPI. Coverage Differences: WPI excludes services, CPI includes services.

WPI uses wholesale prices, CPI uses retail prices. Base Year Revisions: WPI revised from 2004-05 to 2011-12 in 2017. CPI revised from 2010 to 2012 in 2015. Core Inflation Components: Excludes food & beverages (45.

86%) and fuel & light (6.84%) from CPI. International Practices: Most central banks use CPI-type indices, not WPI. Recent Trends: WPI-CPI divergence common due to global commodity volatility and domestic demand patterns.

Committee Recommendations: Urjit Patel Committee (2014) recommended CPI-based targeting.

Mains Revision Notes

Analytical Framework: Inflation measurement serves different purposes - WPI for production costs, CPI for consumer welfare, Core for monetary policy. Structural Analysis: WPI-CPI divergence reflects India's economic structure - manufacturing vs services, wholesale vs retail market efficiency, price transmission mechanisms.

Policy Evolution: Shift from WPI to CPI targeting represents maturation of monetary policy framework, alignment with international practices, focus on consumer-centric approach. Monetary Transmission: CPI-based targeting improves policy transmission through consumer spending, investment decisions, inflation expectations anchoring.

Supply-Demand Distinction: Core inflation helps separate supply-side shocks (weather, global prices) from demand-side pressures (excess liquidity, fiscal expansion). International Comparisons: India's approach aligns with Fed (US), ECB (Europe), Bank of England practices.

Challenges: Food inflation volatility, supply-side constraints, fiscal-monetary coordination needs. Contemporary Issues: Digital economy measurement challenges, climate change impact on food prices, global supply chain disruptions.

Policy Coordination: Need for supply-side reforms to complement demand-side monetary policy. Future Considerations: Base year updates, methodology improvements, new economy integration.

Vyyuha Quick Recall

Vyyuha Quick Recall - 'WPI-CPI-CORE' using 'WHAM vs COP vs PURE': WPI = Wholesale, Heavy manufacturing, All commodities, Manufacturing focus (64%). CPI = Consumer prices, Ordinary people, Personal consumption, Services included (28%). CORE = Clean of volatiles, Underlying trends, RBI policy tool, Excludes food & fuel. Remember '4-6-2-4': WPI has 4 major revisions, CPI covers 6 categories, Core excludes 2 components, RBI targets 4% inflation.