What is the 'free-rider problem'?
a. a cost that one person or group imposes on another person or group
b. a benefit that one person or group gets from another person or group
c. a shared good or service that wouldn't necessarily be available if it were provided privately
d. when a person is unlikely to pay for a good or service but will use the good or service if it is free

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D.  free-riders are folks who enjoy a service but do not contribute to its upkeep.  People who listen to Public Radio or watch Public TV in the U.S. but do not donate are free riders.
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