Over time both real GDP and the price level have trended upward. Which of these trends would the classical dichotomy say could be explained by an upward trend in the money supply?

Suppose a single-price monopoly sells 3 units of a good at $20 per unit. If the monopoly sells 4 units, the total revenue increases to $72. What is the marginal revenue of the fourth unit?

A) $52 B) $18 C) $60 D) $12 E) $20

When regulating a natural monopoly, average cost pricing is usually used rather than marginal cost pricing because

A) average cost pricing allows the firm to earn a normal rate of return on investment, while marginal cost pricing leads to economic losses. B) average cost pricing is more economically efficient than marginal cost pricing. C) average cost pricing leads to lower profits than marginal cost pricing. D) average cost pricing leads to a lower market price than marginal cost pricing.