Table 18-7
the Table Displays Data for a Small, Competitive

Multiple Choice

Table 18-7
The table displays data for a small, competitive, profit-maximizing firm that produces and sells envelopes. Assume that labor is the only input that varies for the firm.
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$$\begin{array} { | c | c | c | } \hline \begin{array} { c } \text { Labor } \\\text { (Number of workers) }\end{array} & \begin{array} { c } \text { Marginal Product of Labor } \\\text { (Boxes of envelopes per week) }\end{array} & \begin{array} { c } \text { Wage } \\\text { (Dollars per } \\\text { worker per week) }\end{array} \\\hline 0 & & \\\hline 1 & 133 & 393 \\\hline 2 & 111 & 393 \\\hline 3 & 93 & 393 \\\hline 4 & 83 & 393 \\\hline 5 & 75 & 393 \\\hline\end{array}$$ ​
-Refer to Table 18-7. Suppose the firm sells each box of envelopes that it produces for $5. What is the marginal profit of the fourth worker?

A) $18
B) $22
C) -$18
D) $415