Why does the opportunity cost of your college education include money you could have earned working instead of going to college?

Question

Quizplus · Accepted Answer

The opportunity cost of your college education includes the money you could have earned working instead of going to college because the best alternative use of your time is working. This means that you could have earned a certain amount of money if you had chosen not to go to college and instead worked during that time.

Why Does the Opportunity Cost of Your College Education Include