Final answer:
A good is rival in consumption if a. one person's use diminishes another's ability to use it, such as with a laptop or an ice cream cone. Public radio, in contrast, is nonrivalrous.
Step-by-step explanation:
A good is rival in consumption if one person's use of the good diminishes another person's ability to use the good. For example, when it comes to a laptop, two people cannot use it simultaneously; therefore, laptops are rivalrous in consumption. On the other hand, public radio is an example of a nonrivalrous good, as it does not prevent multiple individuals from listening at the same time. Consuming an ice cream cone is another instance of rival consumption, as it cannot be efficiently shared and consumed by two people at the exact same moment.