The dilemma is to decide whether to ignore mother's orders or comply with them in this situation.
Opportunity Cost refers to the losses incurred on leaving the other possible alternatives in the decision making and choosing the one. It is the value of the best alternative choose in the process of the decision making.
In the Above situation,the individual would enjoy with friends if he goes to watch the movie However it can lead to trouble with his mother.
However, if individual does cleaning of the lawn; the price would be the fun you would have to forgo.
The best course of action would be to obey your mother because the consequences of doing otherwise are much worse.
Learn more about Opportunity Cost here:
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