John is trying to decide how to divide his time between his job as a stocker in the local
grocery store, which pays $7 per hour for as many hours as he chooses to work, and
cleaning windows for the businesses downtown. He makes $2 for every window he
cleans. John is indifferent between the two tasks, and the number of windows he can
clean depends on how many hours he spends cleaning in a day, as shown in the table
below:
Should John spend a third hour cleaning windows?
A. Yes, because he would earn $28.
B. Yes, because the additional amount he would earn is $14, which is greater than his
opportunity cost of $7.
C. No, because the additional amount he would earn is $6, which is less than his
opportunity cost of $7.
D. Yes, because the additional amount he would earn is $6, which is better than earning
nothing.
The law of demand indicates that as the cost of an activity:
A. falls, less of the activity will occur.
B. rises, more of the activity will occur.
C. rises, the level of the activity may or may not increase depending on the individual.
D. rises, less of the activity will occur.