1.3. Opportunity cost
- Syllabus
- 0455–2027–2028
- Topic
- 1.3
- Level
- —
Learning objectives
Find the next-best alternative forgone
Opportunity cost is the next-best alternative forgone when a choice is made. It exists because scarce resources such as time, income, land and equipment cannot usually be used for every alternative at once.
First identify the option chosen. Then rank the options that were rejected. The opportunity cost is the best rejected option—not the sum of everything else that could have been done.
| Choice made | Best rejected alternative | Opportunity cost |
|---|---|---|
| a farmer grows potatoes rather than wheat | grow wheat | the wheat output forgone |
| a graduate works in a bank rather than teaches | teach economics | the benefits of the teaching job forgone |
| a government funds wind farms rather than extra healthcare | expand healthcare | the healthcare benefits forgone |
Opportunity cost is not automatically the money paid for the chosen option. A free activity can still have an opportunity cost if it uses time that could have produced the next-best benefit. Always name the alternative sacrificed, not merely the price of the choice.
Use opportunity cost to explain economic choices
Opportunity cost influences a decision when an economic agent compares the expected benefit of the chosen use of a limited resource with the benefit of its next-best use. A larger sacrifice makes the chosen option less attractive; a larger expected benefit can justify accepting that sacrifice.
| Economic agent | Limited resource and choice | Relevant opportunity cost |
|---|---|---|
| consumer | spend limited income on one product rather than another | benefit from the next-best product not bought |
| worker | choose between jobs, training, university or leisure | earnings, experience or satisfaction from the next-best option |
| producer/firm | use finance, labour or land for one output or investment | profit or output from the next-best project |
| government | allocate a limited budget among public programmes | social benefit from the next-best programme not funded |
For example, a school leaver comparing university with immediate full-time work considers the earnings forgone while studying as part of the opportunity cost. This is weighed against expected benefits such as qualifications, future earnings and satisfaction from study.
Opportunity cost helps explain a choice but does not prove that one option is correct for everyone. Agents may rank benefits differently, face different constraints or hold different information. The analysis must identify the scarce resource, the chosen option and the next-best alternative forgone.