The liquidity-preference model was first introduced in:

In the figure above, the curve is known as the

A) production possibilities frontier. B) substitution options frontier. C) production function. D) opportunity cost curve.

The efficient output level of a public good occurs where the

A) greatest number of free riders occurs. B) marginal cost of producing the last unit is equal to the marginal benefit realized by consumers. C) marginal cost of production is minimized. D) total cost of production is affordable.