If national income increases by $75 million and consumption increases by $15 million, the marginal propensity to consume is

The concept of marginal productivity is applicable to

a. all of the following b. capital c. entrepreneurial talent d. land e. labor

Some nations that seek to produce all of their own needs face the problem that a. they can deplete their natural resources faster as a result

b. some industries are too small to be efficient if restricted to their domestic markets alone. c. the opportunity cost of producing some of their own goods is higher than that of trading with others for them. d. all of the above are true.