Discuss the significance of the divergence between WPI and CPI inflation for monetary policy. Why does a broad-based food price rise complicate flexible inflation targeting?

In September 2026, WPI inflation reached 11.4%. This was its first double-digit reading on the new 2022-23 base. CPI inflation was 6.1% in rural areas and 4.9% in urban areas [1]. The MPC targets CPI at 4% ±2% under Section 45ZA of the RBI Act. A wide gap between the two indices, together with food prices rising across the board, makes its policy choices harder.

Significance of the WPI–CPI divergence

• Pipeline pressure: WPI tracks producer prices. Industrial and farm input costs "remained elevated" [1], and these can reach retail prices after a lag.
• Early warning: A persistent gap signals that CPI may rise even while the current reading sits inside the band.
• Different baskets: WPI covers goods only and excludes services. CPI gives more weight to food and services. Part of the gap may simply reflect global commodity cycles. It therefore calls for close watching, not automatic rate hikes.
• Margin squeeze: When firms absorb higher costs, profits and investment fall. This brings in the growth side of the "flexible" mandate.
• Statistical caution: The "double-digit" record holds only for the new series [1].

Why broad-based food inflation complicates FIT

• Not transitory: Rice, wheat, pulses and edible oils (led by mustard and palm oil) are all rising [1]. A tomato or onion spike fades quickly; a rise this wide does not.
• Limits of rate tools: Monetary policy cannot reverse the first-round jump in food prices. It can only stop the second-round spillover into wages and other prices [2].
• Expectations risk: Food shocks raise household inflation expectations [2]. A broad-based rise makes this risk larger.
• Equity: Rural inflation (6.1%) is higher than urban (4.9%) [1]. Poor households spend a larger share of income on food, so they are hit hardest.
• Headline vs core dilemma: RBI's framework review asked whether core inflation should guide policy instead [4]. In FY24, food inflation was 7.5% while core inflation fell to a four-year low [3], which shows how far apart the two can move. Even so, RBI's review leans towards retaining headline CPI, and 47 of 48 inflation-targeting countries target headline inflation [5].
• Trade-off: Tightening against supply shocks hurts growth and borrowers. Waiting risks letting inflation expectations drift up.

Both the WPI–CPI gap and the food-price surge point to a need for a coordinated response. The government should handle the supply side through OMSS releases, buffer stocks, the National Mission on Edible Oils and changes to import duties. The MPC should watch core inflation and expectations closely, and the CPI basket should be revised. Shared responsibility of this kind keeps the headline target credible, protects the poor and advances SDG 2 (Zero Hunger).