Cost-push inflation

Also called: Supply-side inflation · Topic: Inflation and Index Numbers: CPI, WPI, IIP and the Deflator · NCERT: Beyond NCERT

Meaning

Cost-push inflation (also called supply-side inflation) is a rise in the general price level that happens because producing goods costs more. Wages, raw materials or energy get dearer, so aggregate supply (the total output that all firms in the economy are willing to produce at each price level) shifts to the left.

It matters because it raises prices and cuts output at the same time. Raising interest rates does not fix it well, because that cools demand but adds no supply. So finding the correct cause decides the correct remedy.

Explanation

How it works

• The chain:
• An input cost rises (oil, wages, fertiliser, food grains).
• Each unit of output now costs firms more, so they raise prices or produce less.

• Aggregate supply shifts left, so prices ↑ and output ↓.

• Stagflation: if cost-push inflation lasts, the economy gets stagnation + inflation together. This means slow growth and rising prices at the same time.

• Demand-pull gives a different result:
• Demand-pull: aggregate demand shifts right, so prices ↑ and output ↑ in the short run.
• Cost-push: aggregate supply shifts left, so prices ↑ but output ↓.

Types and sources

• Supply shocks (a sudden fall in the supply of a key input):
• Monsoon failure and heatwaves: less food is grown, so food prices rise.
• 1973 oil embargo: Arab oil producers cut supply. Crude prices rose about four times, and stagflation followed across the world.

• 2022 Russia–Ukraine war: oil, gas, fertiliser, edible oil and wheat all became dearer.

• Imported inflation (inflation that comes from abroad through the prices of imported goods):

• It comes mainly through crude oil and edible oils.

• Rupee depreciation (the rupee losing value against the dollar) makes every import dearer in rupees.

• Wage-price spiral:

• Prices rise, so workers demand higher wages.
• Higher wages raise firms' costs.
• Firms raise prices again, and the loop repeats.

• Indexed wages (wages linked automatically to a price index) can speed up the loop.

• Greedflation (profit-led inflation):

• Firms raise prices by more than their costs rose, so their profit margins get wider.
• It happens mostly in concentrated markets (a few big sellers and weak competition).

Worked examples (numbers from our notes)

• Rupee channel:
• Crude costs $80 a barrel. At ₹75/$, one barrel costs ₹6,000.
• The rupee weakens to ₹83/$. The same barrel now costs ₹6,640.
• The rupee cost of oil rises 10.7%, even though the world oil price did not change.

• Knock-on effect: diesel gets dearer → freight costs rise → vegetables, cement and many other goods cost more.

• Wage-price spiral:

• Prices rise 6%, so workers win an 8% wage rise.
• Labour costs go up, so firms raise prices by another 5%.

• Workers then ask for more.

• Greedflation:

• Input costs rise ₹5 on a ₹100 product, but the firm raises the price by ₹12.
• ₹7 of that rise is extra profit margin, not higher cost.

What makes it rise or fall

• Rises with: poor monsoons, oil price spikes, a falling rupee, wars that cut supply, indexed wage deals and weak competition.
• Falls with: good harvests, cheaper crude, a stable rupee, supply management (duty cuts, releases from buffer stocks, imports) and stronger competition.

In India

• Oil import dependence:
• India imported about 300 million metric tonnes of crude and petroleum products in 2024-25.
• Domestic producers supply only about 13% of India's oil, so import dependence is about 87% [4].

• This makes India very open to imported cost-push inflation.

• Food prices driven by supply: food inflation fell to 8.39% in December 2024 from 10.87% in October 2024. This shows how much supply-driven food prices can swing [5].

• Headline CPI inflation (annual average): 6.69% (2022), 5.65% (2023), 4.95% (2024) [5].
• Wage indexation: Dearness Allowance is linked to CPI-IW (Consumer Price Index for Industrial Workers). This can feed a wage-price spiral.
• The RBI's response under flexible inflation targeting (FIT):
• The RBI Act, 1934 was amended in May 2016. The Centre notified a target of 4% CPI inflation, with an upper limit of 6% and a lower limit of 2% [1]. This target was kept for 1 April 2021 – 31 March 2026 [2].
• The RBI may "look through" short vegetable-price spikes (choose not to raise rates for them), because these spikes reverse on their own.

• It acts early when a cost shock may last, for example when it starts a wage-price spiral or raises inflation expectations.

• Other tools: buffer stocks, import-duty cuts, lower taxes on fuel and forex intervention. The Competition Commission of India (CCI) can act against greedflation.

Don't confuse with

• Demand-pull inflation: it comes from excess demand ("too much money chasing too few goods"). Aggregate demand shifts right, so output ↑ with prices in the short run. Under cost-push, output ↓.
• Structural inflation: it comes from long-lasting bottlenecks such as low farm yields, poor cold chains and APMC limits. A cost-push shock is usually sudden (a war or a bad monsoon). The remedy for structural inflation is long-term reform, not short-term supply management.
• Stagflation: this is not a separate cause. It is the result when cost-push inflation lasts: high prices together with stagnant output.
• Greedflation: it is a sub-type of cost-push inflation. Prices rise more than costs. In pure cost-push, prices only pass on the higher costs.

Prelims Hooks

• Cost-push inflation shifts aggregate supply left, so prices ↑ and output ↓. Demand-pull shifts aggregate demand right.
• Rupee depreciation causes imported inflation, even when world prices do not change. India's oil import dependence is about 87% (2024-25) [4].
• Dearness Allowance is indexed to CPI-IW, not to WPI.
• 1973 oil embargo: crude prices rose about four times, followed by worldwide stagflation. This is the classic example of a supply shock.
• Trap: repo rate hikes cannot cure supply-driven inflation. "Monetary tightening cannot grow more pulses."
• Greedflation means firms' margins grow by more than their costs rise. It is most likely in concentrated markets, so the CCI is also an anti-inflation tool.

Mains Points

• Diagnosis before cure:
• India's food inflation is mostly supply-driven. It was 10.87% in October 2024, while headline inflation averaged 4.95% in 2024 [5].
• Using repo rate hikes against it hurts growth and adds no supply.

• This supports the RBI's "look-through" approach to temporary shocks. It also shows the need for supply tools: buffer stocks, duty cuts, storage and cold chains.

• Energy security works as inflation policy:

• With about 87% oil import dependence [4], every crude spike or rupee fall brings imported cost-push inflation.

• Ethanol blending, renewables, strategic petroleum reserves and more varied crude sources reduce this risk.

• Stopping second-round effects:

• A one-time cost shock becomes lasting inflation only through wage-price spirals and higher expectations.
• Credible FIT (4% ± 2%) keeps expectations anchored, so a shock fades instead of spreading [1][2]. The reported 2026 renewal of 4% ± 2% up to March 2031 shows the preference for this credibility [3].

Related concepts

• Demand-pull inflation
• Output gap
• Supply shock
• Imported inflation
• Wage-price spiral
• Greedflation
• Structural inflation
• Inflation expectations
• Anchoring of inflation expectations

Read more

• Causes of inflation: demand-pull, cost-push, structural and expectations