If long-run average total cost decreases as output increases, this is due to:

Economists believe that cost-plus pricing may be the best way for a firm to determine its optimal product price when the firm's marginal cost and average cost are about the same and when it is difficult to estimate the product's demand curve

Indicate whether the statement is true or false

Use the following figure to answer the question below. A point on the production possibilities frontier in the figure above is

A. not attainable. B. inefficient. C. local. D. efficient.