If more capital is required to produce one unit of output, it means capital is being used less efficiently.
If less capital is required to produce one unit of output, it means capital is being used more efficiently.
Therefore, Capital Output Ratio is an inverse indicator of capital efficiency.
A lower Capital Output Ratio is better for the economy.

Example

Scenario: Two Countries with Different CORs

Country	Capital Investment (₹ Crore)	GDP Output (₹ Crore)	Capital Output Ratio (COR)
Country A	₹1,000	₹500	2.0 (₹1,000/₹500)
Country B	₹1,000	₹250	4.0 (₹1,000/₹250)

Country A has a COR of 2.0, meaning it needs ₹2 of capital to produce ₹1 of GDP → More efficient.
Country B has a COR of 4.0, meaning it needs ₹4 of capital for ₹1 of GDP → Less efficient, higher wastage of capital.

Incremental Capital Output Ratio

Incremental Capital Output Ratio, or ICOR, shows how much additional capital is required to produce one additional unit of output.
While Capital Output Ratio talks about average capital required for total output, ICOR talks about additional capital required for additional output.

Formula

ICOR = Change in Capital / Change in Output

= (Change in Capital/GDP) / (Change in Output/GDP)

= Investment % in GDP / % change in GDP

Simple Meaning

ICOR tells us how efficiently new investment is being used in the economy.
If ICOR is low, it means additional capital is producing more output.
If ICOR is high, it means additional capital is producing less output.
Therefore, a lower ICOR is better.

Example

Suppose India’s ICOR is 8.This means India requires ₹8 worth of additional capital to produce ₹1 worth of additional output.
If ICOR is 4, it means only ₹4 worth of additional capital is required to produce ₹1 worth of additional output.
So, an ICOR of 4 is better than an ICOR of 8.

Example

Scenario: Two Countries with Different ICORs

Country	Increase in Capital Investment (₹ Crore)	Increase in GDP (₹ Crore)	ICOR
Country A	₹1,000	₹500	2.0 (₹1,000/₹500)
Country B	₹1,000	₹250	4.0 (₹1,000/₹250)

Country A has an ICOR of 2.0, meaning it needs Rs. 2 of additional capital investment to generate Rs. 1 of additional output (GDP growth) → More efficient use of capital.
Country B has an ICOR of 4.0, meaning it needs Rs. 4 of additional capital investment for Rs. 1 of additional output (GDP growth) → Less efficient use of capital.
- Lower ICOR = Efficient capital utilization
- Higher ICOR = Inefficient capital use

So, ICOR represents how efficiently the new/additional capital is being used in a country to produce output.

ICOR, Investment and Growth

The relationship between ICOR, investment and growth can be written as:

Investment Rate = ICOR * % change in GDP

Example

Suppose ICOR is 8 and the government wants to achieve 8% GDP growth.
Then required investment will be:
Investment Rate = ICOR × GDP Growth Rate
Investment Rate = 8 × 8 = 64 %

So, the economy needs investment equal to 64% of GDP to achieve 8% growth.

Now suppose the economy becomes more efficient and ICOR falls to 4.

Then:

Investment Rate = 4 × 8 = 32%
This means the same 8% growth can be achieved with only 32% investment.

Why Lower ICOR is Better?

A lower ICOR means the economy is using capital more efficiently.
It means less investment is needed to produce additional output.
It helps the economy achieve higher growth without requiring very high investment.

Why Higher ICOR is a Problem?

A higher ICOR means capital is being used inefficiently.
It means more investment is required to generate the same amount of growth.
This may happen due to:
- Poor governance
- Project delays
- Cost overruns
- Low skill level of labour
- Poor technology
- Weak infrastructure
- Low capacity utilisation
- Inefficient use of machines
- Poor management
- Regulatory bottlenecks

FAQs

What is Capital Output Ratio (COR)?

Capital Output Ratio is the amount of capital required to produce one unit of output.

What is ICOR?

Incremental Capital Output Ratio (ICOR) measures the additional capital required to generate one additional unit of output.

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Capital Output Ratio (COR) & Incremental Capital Output Ratio (ICOR)

Capital Output Ratio and Incremental Capital Output Ratio (ICOR)

UPSC Prelims Facts