sewage emissions for this city. See Production, Costs and Industry Structure if you need a refresher on

how to calculate marginal costs.

b. What is the optimal level of sewage for this city?

c. Why not just pass a law that firms can emit zero sewage? After all, the total benefits of zero emissions

exceed the total costs.

11. The state of Colorado requires oil and gas companies who use fracking techniques to return the land to its

original condition after the oil and gas extractions. Table 12.9 shows the total cost and total benefits (in

dollars) of this policy.

Land Restored (in acres) Total Cost Total Benefit

0

100

200

300

400

TABLE 12.9

$0

$20

$80

$0

$140

$240

$160

$320

$280

$380

a. Calculate the marginal cost and the marginal benefit at each quantity (acre) of land restored. See

Production, Costs and Industry Structure if you need a refresher on how to calculate marginal costs

and benefits.

b.
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