Opportunity Cost Definition

Definition: Opportunity cost is the next best alternative foregone.

The fundamental problem of economics is the issue of scarcity. Therefore we are concerned with the optimal use and distribution of these scarce resources. Wherever there is scarcity we are forced to make choices. If we have £20 we can spend it on an economic textbook or we can enjoy a meal in a restaurant.

If we spend that £20 on a textbook, the opportunity cost is the restaurant meal we cannot afford to pay.

Production Possibility Frontier and opportunity cost


  • Moving from Point A to B will lead to an increase in services (22-25). But, the opportunity cost is that output of goods falls from 15 to 11.
  • Therefore, the opportunity cost of increasing consumption of services is the 4 goods foregone

At point C, the economy is inefficient. We can increase both goods and services without any opportunity cost.

Examples of Opportunity Cost

The Cost of War. If the government spends $870bn on a war, it is $870bn they cannot spend on education, health care or cutting taxes / reducing budget deficit.

Spending on new road. If the government build a new road, then that money can’t be used for alternative spending plans, such as education and health care.


If you have 12 hours at your disposal during the day, you could spend these hours in work or leisure. The opportunity cost of spending all day watching TV, is that you are not able to do any study during the day.


This shows a trade off between working and hours spent in leisure. If you enjoy 2 hours more leisure, the opportunity cost is 2 hours lost for studying.

Actual Opportunity Cost

Suppose you buy a new car for £10,000. After three years it has depreciated in value to £3,000. What is opportunity cost of deciding to keeping the car?

The opportunity cost of keeping the car is the £3,000 you could have got for selling the car. The price you bought it for is not relevant here

Importance of Opportunity Cost

  • Do you support the repeal of the estate tax that means you pay tax on inherited money?
  • Do you support the repeal of the estate tax if you have to pay higher rate of VAT?

See this interesting survey which shows people have a very different responses when they understand the opportunity cost involved in a tax cut.

Opportunity cost and comparative advantage.

The theory of comparative advantage states that countries should specialise in producing goods where they have a lower opportunity cost.

Opportunity cost and a free good

If there is no opportunity cost in consuming a good, we can term it a free good. For example, if you breathe air, it doesn’t reduce the amount available to other people – there is no opportunity cost.

10 thoughts on “Opportunity Cost Definition

  1. This article was very helpful in providing me a deeper understanding of the concept of opportunity cost. Thank you so much for the detailed yet precise information this site offers!

  2. well thnx for such a precious knowledge .. even now i knew the basic concept of oppurtunity cost even my college time i was so much confused a bout that but now i knew it very well thanx.

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