A city currently emits 16 million gallons (MG) of raw sewage into a lake that
is beside the city. Table 12.13 shows the total costs (TC) in thousands of
dollars of cleaning up the sewage to different levels, together with the total
benefits (TB) of doing so. Benefits include environmental, recreational,
health, and industrial benefits.
a. Using the information in Table 12.13 calculate the marginal costs and
marginal benefits of reducing sewage emissions for this city.
b. What is the optimal level of sewage for this city? How can you tell?