Which one of the following will not cause the production possibilities curve to shift outward?

A barrier to entry is

A) the economic term for diseconomies of scale. B) illegal in most markets. C) anything that protects a firm from the arrival of new competitors. D) a factor that increases competition because firms must continue to operate in the market in which they were founded. E) the same as rent seeking.

Refer to the above table. What does the marginal physical product equal when the amount of labor goes from 10 to 11 units?

A) 600 B) 500 C) 100 D) 54.5