The government is involved in providing many goods and services. For each of the goods or services listed, determine whether it is rival or nonrival in consumption and whether it is excludable or nonexcludable. What type of good is it? Without government involvement, would the quantity provided be efficient, inefficiently low, or inefficiently high?
a. Street signs
b. Amtrak rail service
c. Regulations limiting pollution
d. A congested interstate highway without tolls
e. A lighthouse on the coast