Exhibit 30-3 Costs of Eliminating:Firm A Firm B Firm C 1st ton of pollution$ 30 $ 50 $  600 2nd ton of pollution$ 70 $ 90 $  700 3rd ton of pollution$125 $150 $  900 4th ton of pollution$200 $250 $1,300 Refer to Exhibit 30-3. What is the cost to Firm B of eliminating 2 tons of pollution?

Consider the perfectly competitive firm in the above figure. At what price will long-run equilibrium occur?

A) $11 B) $12 C) $22 D) $23

In the foreign exchange market, the quantity U.S. dollars supplied is a function of:

A) the amount of imports and the level of capital outflows. B) the amount of exports and the level of capital outflows. C) the amount of exports and the level of capital inflows. D) none of the above.