When did NAFTA go into effect?

In a market supply and demand graph, the socially efficient outcome occurs

a. Where the private marginal benefits intersect with the social marginal costs b. Where the private marginal benefits intersect with the private marginal costs c. Where the social marginal benefits intersect with the social marginal costs d. Where the social marginal benefits intersect with the private marginal costs e. Where externalities are maximized

When the Fed purchases federal government bonds in the open market

A) the demand for money expands. B) there is no change in the money supply. C) the money supply expands. D) the money supply contracts.