The free-rider problem refers to:
Choose one answer.
a. a situation in which consumers have no incentive to pay for a nonexcludable good.
b. a variation on the phrase, “There's no such thing as a free lunch,” which is replaced by, “There's no such thing as a free ride.”
c. the situation in the Old West when land was largely unfenced and riders had unfettered access to private range land.
d. qualifications or “riders” that clients do not request, but which lawyers tend to include in contracts anyway at no extra charge.