Scarcity: Why Every Decision Has a Hidden Cost
Definition
Opportunity cost: the value of the next best alternative forgone when a choice is made.
- The fundamental economic problem is scarcity: resources are finite while human wants are effectively unlimited.
- Because we cannot have everything, every use of a resource means giving up an alternative use.
- That sacrifice is the opportunity cost, and it sits behind every choice a consumer, firm or government makes.
Note
- Scarcity is permanent and affects every economy, however rich or poor.
- Opportunity cost is the value of the next best alternative given up, not the value of every alternative added together.
From Scarcity to Choice to Opportunity Cost
- Scarcity
- Limited resources cannot meet unlimited wants, so something always has to give.
- Choice
- Scarcity forces every agent to select some options and reject others.
- Opportunity cost
- A choice is only worthwhile if its benefit is greater than the next best thing given up.
Example
- If the government spends £10 billion on the NHS, the opportunity cost is the next best use of that money, such as schools or defence.
- Adding up every possible alternative at once would overstate the cost, which is why only the single next best one counts.
Consumers, Firms and Governments All Face Opportunity Cost
- Consumers
- Spending on one good means forgoing another, such as a holiday instead of a new phone.
- Firms
- Using capacity to make one product sacrifices the profit from the next best product.
- Government
- Every spending decision trades off against the next best public project or a tax cut.
Opportunity Cost Is Powerful but Hard to Measure
- It forces decision-makers to treat resources as costly rather than free, which improves the quality of choices.
- In practice the next best alternative is not always known, so the cost can be hard to pin down.
- Some sacrifices, such as time, health or the environment, are real but difficult to value in money.
- Even so, thinking in opportunity-cost terms is one of the most widely applied ideas in the whole subject.
State Exactly What Is Given Up
Exam technique
- Define opportunity cost precisely as the next best alternative forgone, not simply what you lose.
- Name the specific sacrifice in the context given rather than talking in general terms.
- Use it to justify a decision by comparing the benefit gained with the best alternative given up.
Common Mistake
- Do not confuse scarcity with a shortage.
- Scarcity is the permanent gap between wants and resources, while a shortage is a temporary excess of demand over supply at the current price.
- Do not treat opportunity cost as the sum of all the alternatives.
- It is only the single next best option that is given up.
Self review
- Define the fundamental economic problem.
- What is the difference between scarcity and a shortage?
- Define opportunity cost precisely.
- Give an opportunity cost example for a consumer, a firm and a government.
- Why can opportunity cost be hard to measure in practice?
