Suppose people value clean air more as their incomes increase, then
A. the marginal benefit curve of pollution abatement to shift left, increasing the degree of air quality.
B. the marginal cost curve of pollution abatement to shift left, increasing the degree of air quality.
C. the marginal cost curve of pollution abatement to shift right, increasing the degree of air quality.
D. the marginal benefit curve of pollution abatement to shift right, increasing the degree of air quality.
Answer: D
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