The Total Production Schedule for Greeting Card Writers Is as Follows

Essay

The total production schedule for greeting card writers is as follows: $\begin{array}{cc}\text { Quantity of }\\\text { Writers }&\text { Total Cards }\\1 & 50 \\2 & 65 \\3 & 76 \\4 & 86 \\5 & 94 \\6 & 100\end{array}$
a. Find the marginal product for each additional worker, and graph the marginal product of labor (MPL) curve.
b. Why is the slope of the MPL curve negative?