The opportunity cost in this scenario is the three lost opportunities Harry experiences by deciding to go to his parent's house. The term opportunity cost refers to the loss of potential gain from other alternatives when one alternative is chosen. The potential gain Harry may have lost by choosing to go to his parents for dinner instead could be relaxation while fishing, His house painting being finished, and time spent with his friends at the birthday party. These all can be considered lost opportunities due to choosing an alternate opportunity, that being dinner at his parents.
