A downward- sloping marginal benefit curve for pollution abatement means that

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A downward-sloping marginal benefit curve for pollution abatement indicates that there are decreasing incremental benefits to be realized from additional increments of pollution abatement. In simpler terms, the initial steps towards reducing pollution may result in significant benefits, but as more and more pollution is reduced, the additional benefits become smaller and smaller. This is because the most visible and hazardous sources of pollution are typically addressed first, leaving smaller and less significant sources for later. Ultimately, the cost of removing each additional unit of pollution exceeds the benefits gained from doing so, resulting in a downward-sloping marginal benefit curve.

A Downward- Sloping Marginal Benefit Curve for Pollution Abatement Means