Consider the example of Figure 11.3. Suppose we define as fair a cutback in which the two sources have the same total costs. Would an equiproportionate reduction be fair in this sense? A reduction meeting the equimarginal principle? Is this a reasonable definition of fair?

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Emission Level (tons/ month) 20 19 18 17 16 15 14 13 12 11 10 9 8765 AMNIO 4 3 2 1 0 Marginal Abatement Costs ($) A 0.00 1.00 2.10 4.60 3.30 9.40 4.60 19.30 6.00 32.50 7.60 54.90 9.40 82.90 11.50 116.90 13.90 156.90 16.50 204.90 19.30 264.90 22.30 332.90 25.50 406.90 28.90 487.00 32.50 577.00 36.30 677.20 40.50 787.20 907.20 1,037.20 1,187.20 B 0.00 2.10 44.90 49.70 54.90 $ 204.9 32.5 16.5 MACA MACB 5 15 10 Emissions (tons/month) 20