Productivity-diminishing returns
The figure is a typical graph of worker productivity as a function of time on the job.
(a) If P represents the productivity and t represents the time, write a mathematical symbol that represents the rate of change of productivity with respect to time.
(b) Which of A, B, and C is the critical point for the rate of change found in part (a)? This point actually corresponds to the point at which the rate of production is maximized, or the point for maximum worker efficiency. In economics, this is called the point of diminishing returns.
(c) Which of A, B, and C corresponds to the upper limit of worker productivity?