Answer
A good is excludable if it is possible to prevent someone from using it. A good is ‘rival in consumption if one individual’s use of the good reduces others’ ability to use the same unit of that good.
A slice of pizza is excludable because its price may prevent a person from consuming it. A slice of pizza is also rival in consumption because one person’s benefit from eating that slice prevents another person from eating it.
Work Step by Step
Referring to the definitions of 'rivalrous' and 'excludable', a slice of pizza satisfies both characteristics.
