When the dollar "cost" of a unit of foreign currency falls, the dollar is against the foreign currency.

Which of the following will cause an increase in the quantity demanded of ice cream at an ice cream store?

a. The onset of summer brings about an increase in the temperature. b. The price of frozen yogurt that is sold at the store is reduced by 5 percent. c. A new ice cream flavor is introduced at the store. d. The store introduces a limited period offer of 20 percent off on the price of ice cream. e. The income of the store's consumers increases.

The competitive firm's short-run supply curve is that portion of the

a. average variable cost curve that lies above marginal cost. b. average total cost curve that lies above marginal cost. c. marginal cost curve that lies above average variable cost. d. marginal cost curve that lies above average total cost.