AP® Microeconomics · Unit 1 · Topic 1.5
Explicit Costs, Implicit Costs, and Opportunity Cost
Economic cost is explicit cost (actual money paid) plus implicit cost (the value of the best forgone alternative). Together they measure the true opportunity cost of a decision, not just the cash spent.
Every choice has a price tag beyond the receipt. Explicit costs are the out-of-pocket payments you can see: tuition, rent, ovens, ingredients. Implicit costs are the values you give up by not using your time or money in their next best way: the salary you didn't earn, the interest your savings didn't collect. Add the two together and you get economic cost, the full opportunity cost of a decision. Accounting cost only counts the explicit side, which is why a business can look profitable on paper while actually losing money once implicit costs are counted.
This is why quitting a 60000 dollar job to open a bakery costs far more than the ovens and flour. The explicit costs might be 20000 dollars, but the implicit cost is the 60000 dollar salary walked away from. The true economic cost of that year of baking is 80000 dollars, even though only 20000 changed hands. The same logic applies to using your own savings: if you put 50000 dollars of personal capital into a shop instead of investing it at 5 percent, you give up 2500 dollars in interest, an implicit cost even though no bill arrives for it.
This idea is what makes the production possibilities frontier and comparative advantage make sense: both are built on opportunity cost, just applied to goods instead of money. It also sets up marginal analysis, where every decision, including how to spend the next hour, gets judged against its opportunity cost. A higher wage raises the implicit cost of anything else you could be doing with that hour, including studying.
Key terms
- Explicit cost
- An actual monetary payment made for a resource, like wages, rent, or materials.
- Implicit cost
- The value of the best forgone alternative when using a resource you already own, such as your own time or money.
- Economic cost
- The sum of explicit and implicit costs, representing the full opportunity cost of a decision.
- Opportunity cost
- The value of the next best alternative given up when making a choice.
- Accounting profit
- Revenue minus explicit costs only, ignoring implicit costs.
Watch it explained
- How it worksHow do explicit and implicit costs stack into the true economic cost of a decision?
- Worked exampleFind the economic cost of a year of college with 30000 in tuition and a 40000 salary given up.
- Common mistakeWhy isn't the money you actually paid the full cost of a choice?
- Going furtherWhat happens to the cost of an hour of studying when your wage doubles?
Check yourself
End of topic.