The free rider problem refers to a situation in which
Select one:
a. people consume a pure public good without payment, even though the good may not be produced if no one chooses to pay.
b. the marginal cost of allowing additional consumers to consume a public good is zero.
c. high income individuals subsidize the production of goods, such as education, that make society better off.
d. markets fail to allocate resources efficiently when benefits outweigh costs.