Quantity of Ice Price of Ice Price of Frozen Cream Income Cream Yogurt Demanded 10 $3.00 $37,500 $3.00 30 $1.00 $37,500 $3.00 30 $3.00 $62,500 $3.00 $3.00 $37,500 $7.00

A city currently emits 15 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. Using the information in Table 12.13 calculate the marginal costs and marginal benefits of reducing sewage emissions for this City. What is the optimal level of sewage for this city? How can you tell?

Suppose a city releases 16 million gallons of raw sewage into a nearby lake. Table 12.8 shows the total costs of cleaning up the sewage to different levels, together with the total benefits of doing so. (Benefits include environmental, recreational, health, and industrial benefits.) Using the information in Table 12.8, calculate the marginal costs and marginal benefits of reducing sewage emissions for this city. See Production, Costs and Industry Structure if you need a refresher on how to calculate marginal costs. What is the optimal level of sewage for this city? Why not just pass a law that films can emit zero sewage? After all, the total benefits of zero emissions exceed the total costs.

Table 1: Market for Skis P 0 20 40 60 80 Qd 25 20 15 10 5 100 0 Qs 0 4 8 12 16 20

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O Macmillan Learning You have landed a job as an analyst working for a company that is creating a new environmentally friendly single cup coffee maker. a. Using the accompanying graph, place the points on the graph to create the individual supply curve for your company. Price Quantity supplied (thousands) $100 0 $150 500 $200 1,000 $250 1,500 $300 2,000 $350 2,500 $400 3,000 Supply 500 450 400 350 300 8250 Price (S) 200 150 100 888 50 0 0 500 1.000 1,500 2,000 Quantity supplied (thousands) 2,500 3,000 b. The supply curve for your company follow the law of supply.

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3. The figure shows supply and demand for planting trees, based on private costs and private value. Trees sequester carbon, meaning that they help counteract pollutants that contribute to climate change. Supply is given by P=(1/5)Q+4. Price of trees ($) 16 vlleiona sdi toode grind of gaitneleon oxibiadua Insamovog od bluoria doum woll > (laval lernitqo siooz - love pioiflo aniH) Sninaly sou to level insioifto Quantity of trees 80 Vanui D=PV=SV a. Suppose that the carbon sequestration that results from planting a tree is worth $4. Graph the social cost curve for tree planting that accounts for the positive externality indo of trees. O noitesubs sgo lovel yus 101 aftened steving sdh besoxs noitesubs 02/20 exibiadure of me 1944an2be agellos to innome insisifie yllisimmanoce sil oiterubo ogollos to calv b. Ignoring the positive externality, how many trees will be planted? uba

What is an externality?