Which of the following statements is the general economic equivalent for "The profit maximizing employment level is when the Marginal Rate of Productivity is equal to the Marginal Rate of Investment" :
A. Discouraged workers may choose to drop out of the labor market
B. CPI is a measure used to determine the real value of money
C. In the long run, we are all dead.
D. The profit maximizing quantity is where marginal revenue equals marginal costs