a. In the accompanying graph move the marginal benefit curves (MBA, MB) for the pollution generated by two plants, A and B, in 1988. Assume that without government intervention, each plant emits the same amount of pollution, but that at all levels of pollution less than this amount, plant A's marginal benefit of polluting is less than that of plant B. Mark the quantity of pollution that each plant produces without government action (QMKT). CMB B MB A Marginal benefit to individual polluter MKT Quantity of pollution emissions