(Table: Public Goods) The table shows the number of acres of a public park that four residents demand at different willingness-to-pay levels. If the cost of providing the resource is $10 per acre, the optimal number of acres will be _____ acres.
$\begin{array}{|c|c|c|c|c|}
\hline P & Q_{1} & Q_{2} & Q_{3} & Q_{4} \
\hline 0 & 7 & 10 & 5 & 4 \
\hline 1 & 6 & 9 & 4 & 3 \
\hline 2 & 5 & 8 & 3 & 2 \
\hline 3 & 4 & 7 & 2 & 1 \
\hline 4 & 3 & 6 & 1 & 0 \
\hline 5 & 2 & 5 & 0 & 0 \
\hline 6 & 1 & 4 & 0 & 0 \
\hline 7 & 0 & 3 & 0 & 0 \
\hline 8 & 0 & 2 & 0 & 0 \
\hline 9 & 0 & 1 & 0 & 0 \
\hline 10 & 0 & 0 & 0 & 0 \
\hline
\end{array}$

Question

Quizplus · Accepted Answer

The optimal number of acres is where the total willingness to pay equals the cost. At 4 acres, the total willingness to pay is $10 (3+6+1+0), which matches the cost per acre.

(Table: Public Goods) the Table Shows the Number of Acres