Refer to the figure above. If the monopolist faces a constant marginal cost of $6, what is the optimal quantity that it should produce?

When the unemployment rate is ________ the natural unemployment rate, real GDP is ________ potential GDP

A) below; above B) above; the same as C) the same as; below D) the same as; above E) above; above

Diminishing marginal product suggests that the marginal

a. cost of an extra worker is unchanged. b. cost of an extra worker is less than the previous worker's marginal cost. c. product of an extra worker is less than the previous worker's marginal product. d. product of an extra worker is greater than the previous worker's marginal product.