If your annual income rose by 10 percent and you increased your purchases of shoes from 2 pairs to 3 pairs each year, then your demand for shoes is

An increase in aggregate demand is shown by

A) a movement up along the aggregate demand curve. B) a leftward shift in the aggregate demand curve. C) the movement down along the aggregate demand curve. D) a rightward shift in the aggregate demand curve.

Individuals A and B both produce good X. A has a comparative advantage in the production of good X if A

A) has a lower opportunity cost of producing good X than has B. B) has a lower opportunity cost of producing good X than of producing good Y. C) can produce more units of X in a given time period than can B. D) can produce X using newer technology than can B.