Economies of scale exist over all ranges of output for which short-run average total cost exceeds long-run average cost

A decrease in the price level makes consumers feel wealthier, so they purchase more. This logic helps explain why the aggregate-demand curve

a) is vertical. b) slopes upward. c) is horizontal. d) slopes downward.

An increase in the level of U.S. exports ________ the demand for goods and service produced in the United States

A) increases B) does not affect C) decreases D) increases or decreases