1- A swimming athlete is deciding whether to work out for an extra hour. Her marginal benefit from another hour of exercise

Select one:

A. is less than the marginal cost of the additional hour of swimming.

B. is the benefit she gets from all the hours she has worked out all week.

C. depends on the cost of the extra hour of workout.

D. is the benefit she receives from practicing the additional hour.

2- A key principle of economics is that people respond to incentives. An incentive

Select one:

A. is the opposite of a tradeoff.

B. could be either a reward or a penalty.

C. could be a reward but could not be a penalty.

D. could be a penalty but could not be a reward.