The same factors that lead to a change in quantity demanded also cause a change in demand.

Graphically, producer surplus is the area under the

A) demand curve and above the supply curve, up to the relevant quantity. B) price and above the demand curve, up to the relevant quantity. C) price and above the supply curve, up to the relevant quantity. D) price and above the quantity axis, up to the relevant quantity. E) demand curve and above the price, up to the relevant quantity.

Countries engaged in international trade specialize in production based on

A) relative price levels. B) relative foreign exchange rates. C) comparative advantage. D) the differences in transportation costs.