According to the simple quantity theory of money in the AD-AS framework, the AD curve is

The aggregate demand curve would shift to the right as a result of

A) a decrease in the U.S. real interest rate. B) tax increases. C) a decrease in the amount of money in circulation. D) a drop in the price level.

The marginal cost of a good or service

A) can be calculated from the marginal benefit of that good or service. B) decreases as more of the good or service is produced. C) can be derived from the production possibilities frontier. D) graphs as a positively sloped curve, so it cannot be derived from the production possibilities frontier, which is downward sloping. E) None of the above answers is correct.