Suppose That There Are Three Power-Generating Plants,all of Which Generate

Multiple Choice

Suppose that there are three power-generating plants,all of which generate emissions.The table summarizes the cost of emission reduction for each firm given five different levels of pollution: $$\begin{array} { l l l l l r } \text { Tons of smoke emitted per day } & 4 & 3 & 2 & 1 & 0 \\\text { Total abatement cost, firm A } & 0 & \$ 14 & \$ 30 & \$ 50 & \$ 75 \\\text { Total abatement cost, firm B } & 0 & \$ 20 & \$ 45 & \$ 80 & \$ 120 \\\text { Total abatement cost, firm C } & 0 & \$ 25 & \$ 60 & \$ 100 & \$ 150\end{array}$$
In general,all three firms face _____ costs of abatement,suggesting that the principle of _____ applies to pollution abatement.

A) increasing marginal;low-hanging-fruit
B) excessive;cost-benefit
C) high;adverse selection
D) decreasing average;economies of scale