The consumer or producer who enjoys the use of a nonexclusive good but expects others to pay is called A. a free-rider.
A free-rider usually expects others to bear the responsibility for their enjoyment or use of a public good. When many people become free-riders, market failure occurs, which is known as the free-rider syndrome.
This syndrome makes it impossible for public goods to be provided. To minimize this free-rider problem, the government or the entity providing the free service or goods should ensure that users pay.
Thus, the consumer or producer who uses a nonexclusive good but expects others to pay is a free-rider.
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