The use of interchangeable parts in armament production by Whitney and North:
a. caused machinery to be replaced by skilled labor.
b. capital-labor proportions in the US to remain equal to those in England.
c. allowed producers to raise the price of guns.
d. increased the demand for skilled labor.
d. increased the demand for skilled labor.
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What will be an ideal response?
Suppose people value clean air more as their incomes increase, then
A) the marginal cost curve of pollution abatement to shift left, increasing the degree of air quality. B) the marginal cost curve of pollution abatement to shift right, increasing the degree of air quality. C) the marginal benefit curve of pollution abatement to shift right, increasing the degree of air quality. D) the marginal benefit curve of pollution abatement to shift left, increasing the degree of air quality.