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Deriving aggregate marginal abatement cost: There are three firms in an industry. Firm 1's emissions equal e1, firm 2's emissions equal e2, firm 3's emissions equal e3. 1 Derive and plot the aggregate marginal abatement cost curve for the in- dustry for each of the following cases. Also plot the marginal abatement cost curves for each of the individual firms (either on the same picture, or a different picture). (a) Firm 1's MAC equals MAC1(e1) = 6 2e1, for e1 3. Firm 2's MAC equals MAC2(e2) = 8 e2, for e2 8. Firm 3's MAC equals MAC3(e3) = 2 e3, for e3 2. (Hint: look at example 2 from Lecture 11). (b) Firm 1's MAC equals MAC1(e1) = 6 2e1, for e1 3. Firm 2's MAC equals MAC2(e2) = 6 e2, for e2 6. Firm 3 has a constant MAC of 4 and its total emissions in the absence of any abatement equals 4. (Hint: look at both examples 1 and 2 from L11).