Mean Absolute Deviation (MAD) is not always the best in assessing a forecast model accuracy

Gross investment is

A) the wear and tear on private investment. B) the total amount of new private investment purchases. C) what is left over from total new private investment after depreciation. D) the total amount of private investment purchases, whether new or previously existing.

What denotes the output level where economies of scale are exhausted and constant returns to scale begin?

a. minimum efficient scale b. break-even point c. efficient equilibrium d. zero economic profit