If producers who hire labor in a competitive labor market decide to purchase the new automated machine that completes the work of 30 employees, we would expect the labor-demand curve to shift to the:

If a demand curve shifts to the left, then

A) demand has increased. B) quantity demanded has increased. C) demand has decreased. D) quantity demanded has decreased.

Suppose the production of a good results in negative externalities. If output is at the intersection of the demand curve and the marginal social cost curve, then

A. the socially optimal level of output will be produced. B. society will incur a net social cost. C. society will want less output produced, and producers will be willing to satisfy this desire at a price that society deems acceptable. D. b and c