EconomicsISC Class 11 · Economic Growth and Sustainable Development

Economic Growth, Measurement and Difference from Development (ISC Class 11)

Updated 17 October 2026 · Fact-checked

Economic growth is a sustained increase in the real output of goods and services of an economy, measured by the growth rate of real GDP: (Real GDP this year - Real GDP last year) / Real GDP last year x 100. An economy growing at g per cent a year doubles its output in about 70 / g years. Economic development is wider: growth plus structural change and better quality of life.

Divide 70 by the growth rate to get doubling time: 2% takes about 35 years, but 7% takes only about 10.

Illustration drawn for QuestionBuddy.

Understand Economic Growth: Measurement, Rule of 70 and Difference from Development

Meaning. Economic growth is a long-term, sustained rise in the real output (real GDP) of an economy. It is quantitative, measured in real terms (nominal GDP adjusted for price changes), and is shown by an outward shift of the PPC.

Nominal and real GDP. Nominal GDP is measured at current prices; real GDP at constant (base-year) prices. Real GDP = Nominal GDP x 100 / GDP deflator.

Growth rate. (Real GDP in the year - Real GDP in the previous year) / Real GDP in the previous year x 100. Per capita growth is approximately the growth rate of real GDP minus the population growth rate (exactly: (1 + g) / (1 + p) - 1).

Rule of 70 (doubling time). Years to double = 70 / growth rate (per cent). At 7% the output doubles in about 10 years; at 2% in about 35 years.

Sources of growth. More and better capital, a larger and more skilled labour force, technology, and better use of resources.

Economic development. Growth plus structural change (from agriculture to industry and services) and improved quality of life: less poverty, unemployment and inequality; better health, education and freedom.

Growth vs development.

Basis	Growth	Development
Meaning	Rise in real output	Growth plus structural and qualitative change
Nature	Quantitative	Quantitative and qualitative
Scope	Narrow	Wide
Measure	Real GDP growth rate	Real per capita income, HDI, poverty, literacy
Distribution	Ignored	Matters
Possible without the other?	Growth possible without development	Development needs growth

Limits of GDP as a measure. It ignores distribution, unpaid work, environmental damage and leisure.

Economic Growth: Measurement, Rule of 70 and Difference from Development: key facts

Growth rate: Growth rate = (GDP this year - GDP last year) / GDP last year x 100 | Use real GDP; Per cent per year.
Real GDP: Real GDP = Nominal GDP x 100 / GDP deflator | Constant prices; Removes inflation.
Doubling time: Years to double = 70 / growth rate (per cent) | Rule of 70; Approximate.

How to answer Economic Growth: Measurement, Rule of 70 and Difference from Development questions

Convert to real terms before computing growth.

1If nominal values are given, divide by the deflator and multiply by 100.
2Compute the change over the earlier year, as a per cent.
3For per capita growth, subtract the population growth rate (or use the exact ratio).
4For doubling time, divide 70 by the growth rate.

Economic Growth: Measurement, Rule of 70 and Difference from Development 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.

Nominal vs real

Suppose a country's nominal GDP rises from Rs 10,00,000 crore to Rs 11,20,000 crore, while prices rise by 6%.

What is the real growth?

Try it first, then show the solutionSolution

Nominal growth = 12%.
Real growth is approximately 12% - 6% = 6% (exactly 1.12 / 1.06 - 1 = 5.66%).

Answer: About 5.66% real growth.

Memory hook: Strip out inflation before calling it growth.

Tricks to remember Economic Growth: Measurement, Rule of 70 and Difference from Development

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

Real, not nominal
Always deflate before comparing years.
Use it when: Growth.
70 over g
Doubling time = 70 / rate.
Use it when: Doubling.
Growth is a part of development
Development includes growth and more.
Use it when: Difference.

Economic Growth: Measurement, Rule of 70 and Difference from Development: solved examples

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

Example 1: Doubling time · 1 mark · MCQBoard level

At a growth rate of 5% per year, the economy will approximately double in:
(a) 5 years (b) 10 years (c) 14 years (d) 35 years

Try it first, then show the solutionSolution

70 / 5 = 14 years.

Answer: (c) 14 years

Example 2: Growth vs development · 3 marks · Short answerBoard level

State three points of difference between economic growth and economic development. (3 marks)

Try it first, then show the solutionSolution

Meaning: increase in output vs growth plus structural and qualitative change.
Nature: quantitative vs both quantitative and qualitative.
Scope: narrow vs wide.

Answer: Growth is a rise in real output and is quantitative and narrow; development includes structural change and better living standards and is wider.

Example 3: Real GDP and growth · 6 marks · Long answerHarder board level

Nominal GDP of a country was Rs 8,00,000 crore in year 1 (deflator 100) and Rs 9,90,000 crore in year 2 (deflator 110). Find the real GDP for both years, the real growth rate, and the nominal growth rate. If population grew by 1.5%, find the approximate growth of per capita real GDP. (6 marks)

Try it first, then show the solutionSolution

Real GDP year 1 = 8,00,000 crore.
Real GDP year 2 = 9,90,000 x 100 / 110 = 9,00,000 crore.
Real growth = (9,00,000 - 8,00,000) / 8,00,000 x 100 = 12.5%.
Nominal growth = (9,90,000 - 8,00,000) / 8,00,000 x 100 = 23.75%.
Per capita growth is about 12.5 - 1.5 = 11% (exact: 1.125 / 1.015 - 1 = 10.84%).

Answer: Real GDP Rs 8,00,000 crore and Rs 9,00,000 crore; real growth 12.5%; nominal growth 23.75%; per capita growth about 11% (10.84% exactly).

Example 4: Doubling and projection · 5 marks · Long answerHarder board level

An economy has real GDP of Rs 20 lakh crore and grows at 7% a year. Find the approximate doubling time, the GDP after 10 years (use doubling), and the GDP after 1 year exactly and after 2 years exactly. A second economy grows at 3.5%: find its doubling time. (5 marks)

Try it first, then show the solutionSolution

Doubling time = 70 / 7 = 10 years, so GDP after 10 years is about Rs 40 lakh crore.
After 1 year: 20 x 1.07 = Rs 21.4 lakh crore; after 2 years: 21.4 x 1.07 = Rs 22.898 lakh crore.
Second economy: 70 / 3.5 = 20 years.

Answer: About 10 years; about Rs 40 lakh crore after 10 years; Rs 21.4 lakh crore after 1 year and Rs 22.898 lakh crore after 2; the 3.5% economy doubles in 20 years.

Example 5: Growth without development · 4 marks · Short answerHOTS / competency

A country's real GDP grows by 8% for several years but 60% of the benefits go to the richest 10%, unemployment rises, and a large part of the rural population has no access to basic health care. Using the growth-development distinction, evaluate its progress in four points. (4 marks)

Try it first, then show the solutionSolution

Growth is high: real GDP rises 8% a year.
Development is incomplete: inequality, rising unemployment and poor health access.
Distribution matters in development but is ignored in growth.
Policies should aim at inclusive growth: jobs, health, education and social protection.

Answer: The country shows strong growth but weak development; benefits are concentrated, so policy should target inclusion.

Where students lose marks in Economic Growth: Measurement, Rule of 70 and Difference from Development

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

Mistake: Computing growth from nominal values
Ignoring prices.
Wrong working
(9,90,000 - 8,00,000) / 8,00,000
Right working
(9,00,000 - 8,00,000) / 8,00,000
Do this: Deflate first.
Usually costs: 2 marks.
Mistake: Dividing by the later year
Wrong base.
Wrong working
1,00,000 / 9,00,000
Right working
1,00,000 / 8,00,000
Do this: Base is the earlier year.
Usually costs: 2 marks.
Mistake: Treating growth and development as identical
Common usage.
Wrong working
They are the same
Right working
Development includes growth plus qualitative change
Do this: Use the difference table.
Usually costs: 1-2 marks.

Exam tips

Show the deflation step explicitly.
Always state the base year of the growth rate.
Link development to HDI or poverty reduction.

Practice questions on Economic Growth: Measurement, Rule of 70 and Difference from Development

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
Economic growth is best measured by the rate of change of:
(a) nominal GDP (b) real GDP (c) population (d) imports
Hint
Price changes removed.
Answer
(b) real GDP
Q2 · 2 marks · Short answerBoard level
List any four sources of economic growth. (2 marks)
Hint
Capital, labour, technology, efficiency.
Answer
More and better capital, a larger and more skilled labour force, better technology and more efficient use of resources.
Q3 · 4 marks · Short answerHarder board level
Real GDP in 2022-23 was Rs 150 lakh crore and in 2023-24 Rs 160.5 lakh crore. Find the growth rate and the doubling time at that rate. If the population grew 1% and 1.5% in the two years respectively, find approximately the per capita growth in the second year. (4 marks)
Hint
10.5 / 150.
Answer
Growth = 10.5 / 150 x 100 = 7%; doubling time about 10 years; per capita growth in the second year about 7 - 1.5 = 5.5% (exact 5.42%).
Q4 · 5 marks · Long answerHarder board level
Nominal GDP is Rs 50 lakh crore with a deflator of 125 in year 1 and Rs 66 lakh crore with a deflator of 150 in year 2. Find real GDP in both years, the real growth rate and nominal growth rate, and comment. (5 marks)
Hint
50 x 100 / 125.
Answer
Real GDP year 1 = 50 x 100 / 125 = 40; year 2 = 66 x 100 / 150 = 44. Real growth = 4 / 40 x 100 = 10%. Nominal growth = 16 / 50 x 100 = 32%. Most of the nominal rise is inflation.
Q5 · 3 marks · Short answerHOTS / competency
Two economies have equal growth rates of 6% but one has a falling poverty rate and rising literacy while the other has neither. Explain which has better development and why growth alone is not enough. (3 marks)
Hint
Qualitative change.
Answer
The first has better development, since poverty and literacy show improvements in quality of life. Growth is a rise in output and does not tell who benefits; development needs growth plus shared benefits and structural change.

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.Growth is measured by?Show answer
Real GDP growth rate.
2.Rule of 70 gives?Show answer
Doubling time.
3.Real GDP formula?Show answer
Nominal GDP x 100 / deflator.
4.Development includes?Show answer
Growth plus qualitative change.
5.Growth shifts the PPC?Show answer
Outward.

Economic Growth: Measurement, Rule of 70 and Difference from Development: frequently asked questions

Can there be growth without development?

Yes.

Is GDP growth always good?

It does not show distribution or environmental cost.

Is the rule of 70 exact?

No, approximate.

What is a deflator?

A price index used to remove inflation.