Jill, an economics student, has already spent five hours cleaning her room. In deciding whether or not to continue cleaning for another hour, she applies the economic principle of

Question

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Jill is making a decision based on the additional cost and benefit of spending one more hour cleaning her room, which is an example of choosing at the margin. This principle involves making decisions based on the additional benefit (marginal benefit) and additional cost (marginal cost) of that decision.

Jill, an Economics Student, Has Already Spent Five Hours Cleaning