In the simple Keynesian model, the aggregate supply curve has a horizontal segment at levels of output below the level of natural Real GDP and a vertical segment at the level of natural Real GDP

The term "price supports" refers to a

a. shortage. b. surplus. c. price ceiling. d. price floor.

Economies of scale and limited demand can form a natural barrier to entry that can create a natural oligopoly

Indicate whether the statement is true or false