Stagflation

Topic: Inflation and Index Numbers: CPI, WPI, IIP and the Deflator · NCERT: Beyond NCERT

Meaning

Stagflation is a situation in which high inflation, high unemployment and stagnant (very slow or no) economic growth all happen at the same time. The word joins "stagnation" and "inflation".

It matters because it breaks the usual rule that inflation and unemployment move in opposite directions. It also leaves the central bank with no painless option: fighting inflation deepens the slump, and fighting the slump feeds inflation.

Explanation

How it happens: a supply shock

• Stagflation usually starts with a supply shock, not with excess demand.
• A supply shock is a sudden event that makes production costlier or harder, such as an oil price jump or a drought.

• Excess demand is when total demand is larger than what the economy can produce at full employment (NCERT).

• The 1970s oil shocks are the classic case:

• Oil prices jumped sharply, so production costs rose for almost every firm.
• This caused a leftward shift of aggregate supply. Aggregate supply is the total output firms are willing to produce at each price level. After the shift, firms produce less at every price level.
• As a result, prices rose and output fell together.

• Falling output means fewer jobs, so unemployment rose.

• Demand shock vs supply shock:

Shock	Prices	Output / jobs	Phillips-curve movement
Demand rises (excess demand)	↑	↑ (in the short run)	Movement along the curve
Supply falls (oil, drought)	↑	↓	Curve shifts up = stagflation risk

Why it broke the simple Phillips curve

• Phillips curve: a curve showing a short-run inverse relationship between inflation and unemployment. When unemployment is lower, inflation is higher. A.W. Phillips found this in UK data in 1958.
• In the 1960s, governments treated this curve as a fixed menu. They believed they could accept a little more inflation and get permanently lower unemployment in return.
• Stagflation proved this wrong. In the 1970s, inflation and unemployment rose together.
• This helped two other explanations gain ground:
• Supply-side explanations: cost shocks shift the whole curve up.
• The Friedman–Phelps expectations critique: once workers expect higher inflation, the short-run curve shifts up and the trade-off disappears.

The role of expectations: a worked example

• Expectations-augmented Phillips curve: π = πᵉ − β(u − u*)
• π = actual inflation; πᵉ = expected inflation (the inflation people believe will happen); u = actual unemployment; u* = natural rate of unemployment; β = how strongly inflation reacts to slack in the economy.

• The natural rate (u*) is the unemployment that remains when the economy runs at its normal level. It comes from job-search time and skill mismatch, not from weak demand.

• Worked example (πᵉ = 4%, u* = 6%, β = 0.5):

• If u = u* = 6%, then π = πᵉ = 4%.
• If πᵉ rises to 5% and u stays at 6%, then π = 5%. Inflation is higher, but unemployment has not fallen at all.

• If u rises above 6% at the same time, as it does when a supply shock cuts output, the economy has higher inflation and higher unemployment together. That is stagflation.

• Lesson: a supply shock that also raises inflation expectations shifts the short-run curve upward, so each level of unemployment now comes with more inflation.

Measuring the pain: the misery index

• Misery index = inflation rate + unemployment rate. It is a rough gauge of hardship, and it rises sharply during stagflation.
• Worked example: inflation 7% + unemployment 8% gives a misery index of 15. If inflation falls to 4% and unemployment to 6%, the index falls to 10, meaning less hardship.
• Limits:
• It gives equal weight to inflation and unemployment.
• It ignores growth, inequality and underemployment.

The policy dilemma

• If the central bank raises interest rates:
• Loans become costlier, so spending falls and inflation cools.

• But output and jobs fall further, so the slump deepens.

• If it cuts interest rates:

• Borrowing gets cheaper, which supports output and jobs.

• But extra demand adds to inflation that is already high.

• Stagflation remains a risk after big supply shocks, such as in 2022, when energy and food prices rose sharply worldwide.

In India

• The risk comes mainly from supply-side food and fuel shocks.
• A large share of India's inflation comes from food prices. Food inflation is driven by monsoon failure, crop damage and MSP (minimum support price, the price at which the government promises to buy certain crops).
• Good rainfall eases price pressure, while MSP increases push headline inflation up [1].

• Food inflation spreads to other prices. Each 1 percentage point rise in food inflation adds about 15–25 basis points to core inflation (inflation without food and fuel; 100 basis points = 1 percentage point) [1].

• Unemployment data is weak, so the RBI watches the output gap instead.

• Most workers are informal. Underemployment and disguised unemployment (more people on a job than it needs, so some add nothing to output) hide the real level of joblessness.
• Output gap (%) = (Actual GDP − Potential GDP) ÷ Potential GDP × 100. A falling or negative gap together with rising prices is the Indian warning sign of stagflation.

• India's Phillips curve is convex (non-linear). It is flat when the output gap is low or negative, and steep when the gap is large and positive [2]. So when output is weak, the slack does little to pull inflation down, which is the stagflation trap.

• The inflation-targeting framework

• The target is 4% CPI inflation, with an upper tolerance limit of 6% and a lower limit of 2%. It was first notified for 5 August 2016 – 31 March 2021 [3][4].
• The target was kept in the reviews of 31 March 2021 and 25 March 2026. The second review covers 1 April 2026 – 31 March 2031 [3].
• A six-member Monetary Policy Committee (MPC) sets the repo rate (the interest rate at which the RBI lends money to banks for a short time) [3].
• Failure of the target: average inflation stays above 6% or below 2% for three consecutive quarters [3].
• Why a band and not a single number: the band lets the MPC recognise short-run trade-offs between inflation and growth. It also absorbs supply shocks, such as unstable farm output [5]. This is the kind of shock that causes stagflation.

Don't confuse with

• Demand-pull inflation: caused by excess demand. Prices and output rise together, and unemployment falls (a movement along the Phillips curve). Stagflation is caused by a supply fall, so prices rise while output falls.
• Recession / stagnation: falling or flat output and rising unemployment, usually with low or falling inflation. Stagflation has the slump plus high inflation.
• Phillips curve trade-off: says inflation and unemployment move in opposite directions. Stagflation is the case where both rise together, because the short-run curve shifts up.
• NAIRU: the lowest unemployment rate that can be sustained without inflation speeding up. Keeping unemployment below NAIRU causes accelerating inflation from a demand push. Stagflation is high unemployment together with high inflation, caused by a supply shock.

Prelims Hooks

• Stagflation = high inflation + high unemployment + stagnant growth, all at the same time.
• It is caused by a leftward shift of aggregate supply (e.g. the 1970s oil shocks), not by excess demand. Trap: an option saying "excess demand causes stagflation" is wrong.
• In a supply shock, the short-run Phillips curve shifts up. In a demand shock, the economy moves along the curve.
• Misery index = inflation rate + unemployment rate. It is a sum, not a product or a ratio. It rises sharply under stagflation.
• Long-run Phillips curve = vertical at the natural rate of unemployment. In the long run, higher inflation cannot buy lower unemployment.
• RBI's target is 4% CPI (±2%). Failure means three consecutive quarters outside the 2–6% band [3].

Mains Points

• Supply shocks need supply-side answers.
• Stagflation comes from cost shocks (1970s oil, 2022 energy and food), so repo-rate hikes alone can deepen the slump without fixing the cause.

• Better tools are targeted fiscal support (fuel tax cuts, food distribution), buffer stocks, import-duty changes, supply-chain reforms and restraint on MSP-led price pressure.

• Why the RBI cannot fully "look through" food shocks.

• Food inflation spreads to core inflation (about 15–25 basis points per point) [1] and raises household inflation expectations.

• Higher expectations shift the short-run Phillips curve up, and that turns a one-time price jump into lasting stagflation risk.

• The flexible inflation-targeting band is a partial shield.

• The ±2% band lets the MPC tolerate short-run supply shocks and growth trade-offs [5], while the 4% anchor keeps expectations steady.
• Because India's Phillips curve is flat when output is weak [2], cutting inflation through slack alone is costly in lost growth. This makes the timing of policy during stagflation a key GS-III debate.

Related concepts

• Phillips curve
• Long-run Phillips curve
• NAIRU
• Misery index

Read more

• Inflation and unemployment: the Phillips curve, NAIRU and stagflation