Changes in both physical and human capital affect a nation's ability to produce goods and services

Production points inside the PPF are

A) efficient but not attainable. B) efficient and attainable. C) inefficient and not attainable. D) inefficient and attainable.

Suppose that each worker must use only one shovel to dig a trench, and shovels are useless by themselves. In the long run, the firm will experience

A) increasing returns to scale. B) constant returns to scale. C) decreasing returns to scale. D) The returns to scale cannot be determined from the information provided.