EconomicsISC Class 12 · Money

Inflation: Meaning, Rate Calculation, Demand-Pull and Cost-Push Inflation Explained

Updated 17 October 2026 · Fact-checked

Inflation is a sustained rise in the general price level, so that a unit of money buys fewer goods. The inflation rate = (price index this year - price index last year) / price index last year x 100. Demand-pull inflation arises when aggregate demand exceeds the available supply (too much money chasing too few goods); cost-push inflation arises when the cost of production, such as wages or raw materials, rises and firms pass it on in prices.

Demand-pull starts when demand outruns supply; cost-push starts when production costs rise; both end in a rise in the general price level.

Illustration drawn for QuestionBuddy.

Understand Inflation: Meaning, Demand-Pull and Cost-Push

1. Meaning. Inflation is a persistent and appreciable rise in the general price level over a period; it is not a rise in the price of a single good. Its opposite, deflation, is a sustained fall in the general price level. Inflation means the purchasing power of money falls.

2. Measuring the rate. A price index (such as a consumer price index) compares the cost of a fixed basket of goods with a base period (base = 100). Inflation rate = (index in the current year - index in the previous year) / index in the previous year x 100. Real value = nominal value x 100 / price index; real income shows what income can actually buy.

3. Demand-pull inflation (diagram not required). Prices rise because aggregate demand outruns aggregate supply, usually near full employment, where output cannot rise to match. Often described as too much money chasing too few goods. *Causes:* a rise in the money supply, easy credit and low interest rates, higher government spending or tax cuts, rising incomes and consumption, higher export demand, increased black money, and a fall in saving. *Remedy:* reduce demand (higher repo rate, CRR and SLR, sale of securities, lower government spending, higher taxes).

4. Cost-push inflation (diagram not required). Prices rise because the cost of production rises and producers pass it on, even when demand has not risen. *Causes:* higher wages not matched by productivity, higher prices of raw materials and fuel (including imported inputs when the exchange rate falls), higher indirect taxes, higher profit margins of firms with market power, supply shocks (a poor harvest, a strike or a disruption of transport). *Remedies:* increase supply and productivity, reduce indirect taxes on inputs, keep input and wage rises in line with productivity, improve supply chains; tightening demand alone cannot remove the cost pressure and may lower output.

5. Comparing the two. In demand-pull inflation output is at or near the full-employment level, and the pressure comes from demand; in cost-push inflation the pressure comes from the supply side and output may fall or stagnate while prices rise. Real-life inflation often mixes both.

6. Effects of inflation. Fixed-income earners (pensioners, salaried people whose wages lag) and lenders at fixed interest rates lose purchasing power; borrowers gain because they repay in cheaper money; savers in cash lose; exporters may lose competitiveness; income and wealth distribution can become more unequal; uncertainty discourages long-term investment. Moderate inflation with growth is less harmful than rapid inflation.

7. Control (brief). Monetary measures by the RBI (policy rates, reserve ratios, open market operations) and fiscal measures (lower government spending, higher taxes) reduce demand; supply-side steps (more production, imports of scarce goods, better distribution, price control for essentials) tackle supply shortages.

Inflation: Meaning, Demand-Pull and Cost-Push: key facts

Inflation rate: Inflation rate = (index now - index before) / index before x 100
Real value: Real value = nominal value x 100 / price index
Real income: Real income = money income x 100 / price index
Cost with a mark-up: Price = cost + mark-up on cost

How to answer Inflation: Meaning, Demand-Pull and Cost-Push questions

Inflation numericals use index numbers and percentages; identify the type of inflation from the source of pressure.

1Inflation rate: find the change in the index and divide by the earlier index.
2Real income: divide money income by the index and multiply by 100 (so base year = 100).
3Compare real incomes in two years to judge gains or losses.
4For cost-push pass-through: compute the change in unit cost, then apply the mark-up to get the new price.
5To classify inflation: if demand pressure (money supply, spending) is the source, it is demand-pull; if costs rise first, it is cost-push.

Inflation: Meaning, Demand-Pull and Cost-Push in real life

The idea, met in an everyday situation. Answer the question in your own words, then compare with the model answer. The one-line hook is what to remember.

The salary that does not stretch

Suppose a clerk earns Rs 40,000 a month when the consumer price index is 125. A year later the index is 135 and her salary has been raised by 5 per cent to Rs 42,000.

What is the inflation rate, and is she better off in real terms?

Try it first, then show the solutionSolution

Inflation = (135 - 125)/125 x 100 = 8%.
Real salary before = 40,000 x 100/125 = Rs 32,000.
Real salary after = 42,000 x 100/135 = about Rs 31,111.

Answer: Inflation is 8%, and her real salary falls by about Rs 889 (2.8%) because the 5% rise is below the 8% rise in prices.

Memory hook: Count what money buys, not how much money.

Tricks to remember Inflation: Meaning, Demand-Pull and Cost-Push

Short memory aids. Say each one aloud once, then use it on a question the same day.

Demand-pull = too much money
Pull means buyers are pulling prices up: too much money chasing too few goods.
Use it when: Defining demand-pull.
Cost-push = producers pass the bill
Push from the supply side: wages, raw materials, taxes.
Use it when: Defining cost-push.
Real = nominal over index
Real income = money income x 100 / index.
Use it when: Real value numericals.

Inflation: Meaning, Demand-Pull and Cost-Push: solved examples

Ordered from board level to HOTS. Try each one before you open the solution.

Example 1: Type of inflation · 1 mark · MCQBoard level

Inflation caused by a rise in the price of raw materials and wages is called:
(a) demand-pull inflation
(b) cost-push inflation
(c) deflation
(d) stagnation

Try it first, then show the solutionSolution

A rise in the cost of production pushes prices up from the supply side.

Answer: (b) cost-push inflation

Example 2: Inflation rate · 3 marks · Short answerBoard level

The consumer price index of an economy rose from 125 in one year to 135 in the next. Find the rate of inflation. If the index had fallen to 120, what would the percentage change have been, and what is it called? (3 marks)

Try it first, then show the solutionSolution

Inflation = (135 - 125)/125 x 100 = 10/125 x 100 = 8%.
If the index fell to 120: (120 - 125)/125 x 100 = -4%.
A sustained fall in the general price level is deflation.

Answer: Inflation is 8%; a fall to 120 would be -4%, which is deflation.

Example 3: Real income · 4 marks · Short answerHarder board level

Nisha's monthly salary is Rs 40,000 when the price index is 125. A year later it is Rs 42,000 and the index is 135. Compare her real incomes and state the percentage change. What does it show? (4 marks)

Try it first, then show the solutionSolution

Real income (before) = 40,000 x 100/125 = Rs 32,000.
Real income (after) = 42,000 x 100/135 = Rs 31,111 (approximately).
Fall = 32,000 - 31,111 = Rs 889, i.e. 889/32,000 x 100 = about 2.8%.
Money salary rose 5% but prices rose 8%, so purchasing power fell.

Answer: Real income falls from Rs 32,000 to about Rs 31,111, a fall of about 2.8%: money income rose, but real income fell because inflation was higher.

Example 4: Cost-push pass-through · 4 marks · Short answerHarder board level

A firm's cost per unit is Rs 90: raw material Rs 60 and wages Rs 30. It charges a price 20% above cost. Raw material and wages both rise by 20%. Find the old and new prices and the percentage rise in price. Which kind of inflation is this? (4 marks)

Try it first, then show the solutionSolution

Old price = 90 x 1.20 = Rs 108.
New cost = 60 x 1.2 + 30 x 1.2 = 72 + 36 = Rs 108.
New price = 108 x 1.20 = Rs 129.60.
Price rise = (129.60 - 108)/108 x 100 = 20%.
This is cost-push inflation: the rise in costs is passed on in prices.

Answer: Price rises from Rs 108 to Rs 129.60, a rise of 20%: cost-push inflation.

Example 5: Would a rate rise cure a cost shock? · 4 marks · Short answerHOTS / competency

Fuel is 20% of the cost of goods and fuel prices rise by 25%. (a) Find the average rise in cost if fully passed on. (b) The central bank raises the repo rate to control the resulting inflation. Explain why this may not fully work and what else could be done. (4 marks)

Try it first, then show the solutionSolution

(a) Rise in cost = 20% x 25% = 5%.
(b) A higher repo rate reduces demand (borrowing and spending) but does nothing to the cost of fuel. Firms still face higher costs; weaker demand may reduce output and employment, a poor result.
Supply-side measures help: reducing taxes on fuel, improving supply, shifting to cheaper energy sources and raising productivity.

Answer: Average cost rises by 5%. A rate rise addresses demand, not costs, so cost-push inflation needs supply-side measures too; otherwise the economy risks lower output without much fall in prices.

Where students lose marks in Inflation: Meaning, Demand-Pull and Cost-Push

The slips examiners see most often, and what to write instead.

Mistake: Dividing by the later index
Using the wrong base.
Wrong working
Inflation = 10/135 x 100 = 7.4%.
Right working
Inflation = 10/125 x 100 = 8%.
Do this: The earlier year is the base.
Usually costs: 1-2 marks.
Mistake: Confusing the two types
Wrong source of pressure.
Wrong working
A rise in wages causes demand-pull inflation.
Right working
Higher wages not matched by productivity raise costs: cost-push (though higher incomes can also raise demand).
Do this: Ask: did the pressure start with demand or with cost?
Usually costs: 2 marks.
Mistake: Calling any single price rise inflation
Not saying general price level.
Wrong working
Onions are costly, so there is inflation.
Right working
Inflation is a sustained rise in the general price level.
Do this: Use the phrase 'general price level'.
Usually costs: 1 mark.
Mistake: Comparing money incomes only
Ignoring prices.
Wrong working
Salary rose 5%, so she is better off.
Right working
Compare real incomes: prices rose 8%, so real income fell.
Do this: Deflate by the index before judging.
Usually costs: 1-2 marks.

Exam tips

Define inflation with the phrase 'sustained rise in the general price level' and 'fall in the purchasing power of money'.
Diagrams for demand-pull and cost-push inflation are not required by the syllabus, so explain them in words.
Give two or three causes each for demand-pull and cost-push inflation, with an Indian example if possible.
Show the formula and substitution in every index numerical.
Remember the table of differences: source of pressure, output effect and the usual remedy.

Practice questions on Inflation: Meaning, Demand-Pull and Cost-Push

Write each answer on paper first. Open the hint only if you are stuck, and the answer only when you have finished.

Q1 · 1 mark · MCQBoard level
A rise in aggregate demand over a limited supply of goods in an economy is the main cause of:
(a) cost-push inflation
(b) demand-pull inflation
(c) deflation
(d) devaluation
Hint
Think 'pull from demand'.
Answer
(b) demand-pull inflation
Q2 · 3 marks · Short answerBoard level
The price index rises from 160 to 172 in a year. Calculate the rate of inflation. (3 marks)
Hint
Change divided by the earlier index.
Answer
Inflation = (172 - 160)/160 x 100 = 12/160 x 100 = 7.5%.
Q3 · 4 marks · Short answerHarder board level
A worker's income is Rs 30,000 when the index is 120. His income rises 10% to Rs 33,000. Find his real income in the base year terms before and after if the index (a) rises to 132, (b) rises to 138. Compare. (4 marks)
Hint
Real income = money income x 100 / index.
Answer
Before: 30,000 x 100/120 = Rs 25,000. (a) After: 33,000 x 100/132 = Rs 25,000 (unchanged: income and prices both rose 10%). (b) After: 33,000 x 100/138 = about Rs 23,913, a fall of about 4.3% (inflation of 15% exceeded the 10% rise in money income).
Q4 · 4 marks · Short answerHarder board level
A mobile phone maker has unit cost Rs 500 (components Rs 400, labour Rs 100) and sells at a price 10% above cost. Component prices rise by 15% while labour cost is unchanged. Find the new price, the percentage rise in price and classify the inflation. (4 marks)
Hint
New cost = components x 1.15 + labour.
Answer
Old price = 500 x 1.10 = Rs 550. New cost = 400 x 1.15 + 100 = 460 + 100 = Rs 560. New price = 560 x 1.10 = Rs 616. Rise = 66/550 x 100 = 12%. It is cost-push inflation, as it arises from higher input cost.
Q5 · 3 marks · Short answerHOTS / competency
Explain why cost-push inflation may reduce output while demand-pull inflation tends to increase or leave output unchanged. Use the example of a firm that raises price by 12% to cover costs where the price elasticity of demand for its product is 1.5. (3 marks)
Hint
Quantity falls by Ed x % change in price.
Answer
In demand-pull inflation buyers have more money and are willing to pay more, so sellers can raise price while selling the same or more. In cost-push inflation demand has not risen: if the firm raises price by 12% with Ed = 1.5, quantity demanded falls by 1.5 x 12 = 18%, so output and employment fall while prices rise.

Test your recall

Answer in your head or on paper first, then open the card. Pulling an answer out of memory makes it stick far better than re-reading.

1.Define inflation.Show answer
A sustained rise in the general price level.
2.Inflation rate formula?Show answer
(Index now - index before)/index before x 100.
3.Demand-pull inflation in short?Show answer
Too much money chasing too few goods.
4.Name one cause of cost-push inflation.Show answer
Rise in wages or raw material prices not matched by productivity.
5.Who gains from inflation?Show answer
Borrowers at fixed interest rates (they repay in cheaper money).

Inflation: Meaning, Demand-Pull and Cost-Push: frequently asked questions

What is inflation?

A continuous rise in the general price level, which reduces the purchasing power of money.

What is demand-pull inflation?

Inflation caused when aggregate demand exceeds aggregate supply.

What is cost-push inflation?

Inflation caused by a rise in costs of production, passed on in prices.

Does ISC require diagrams for inflation?

No. Diagrams of demand-pull and cost-push inflation are not required.