Which of the above figures shows a shift in the marginal abatement cost function?

Name: Which of the above figures shows a shift in the marginal abatement cost function?
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Question

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Figure (b) shows a shift in the marginal abatement cost function, with a decrease in the cost of abatement for all levels of pollution reduction. In contrast, Figure (a) shows a movement along the same marginal abatement cost function due to a change in the level of pollution reduction, but not a shift in the function itself.

Which of the Above Figures Shows a Shift in the Marginal