Indicate whether each of the following statements is true, false, or uncertain, and justify your answer.
a. Efficient provision of a public good occurs at the level at which each member of society places the same value on the last unit.
b. If a good is non rival and excludable, it will never be produced by the private sector.
c. A road is non rival because one person’s use of it does not reduce another person’s use of it.
d. Larger communities tend to consume greater quantities of a non rival good than smaller communities.