Answer
1)good that people can be prevented from using.
2)one person’s use decreases another person’s enjoyment.
3)Pizza is both excludable and rival.
Work Step by Step
Excludable good: good that people can be prevented from using.
Rival good: one person’s use decreases another person’s enjoyment.
Pizza is both excludable and rival.
Pizza is excludable: pizza maker can prevent some one who can’t pay for pizza from eating it.
Pizza is rival: if one person eats it, nobody else can.
