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

PPF curve

  • Moving from Point A to B will lead to an increase in services (21-27). But, the opportunity cost is that output of goods falls from 22 to 18.
  • Therefore, the opportunity cost of increasing consumption of services is the 4 goods foregone.

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

C is currently impossible.

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 the budget deficit.

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

Time. 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 the opportunity cost of deciding to keep 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 if that means you pay tax on inherited money?
  • Do you support the repeal of the estate tax if you have to pay a higher rate of VAT?

See this interesting survey which shows people have 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.


  • Present bias – an aspect of behavioural theory which states we place greater value on present benefits and discount future benefits and future opportunity costs.
  • Sunk cost fallacy
By on March 29th, 2017

15 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.

  3. I’m very happy because am already catch several of concepts but my silogan is am thanks for all can formulate this ebook

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