The labor supply curve facing a monopsonist is

The reserve requirement:

A. Is the most frequently used tool by the Fed. B. Changes required reserves but not excess reserves. C. Does not affect the lending capacity for a bank. D. Affects the level of bank reserves.

Suppose that a particular industry has a four-firm concentration ratio of 85 and a Herfindahl index of 3,000. Most likely, this industry would achieve:

A. both productive efficiency and allocative efficiency. B. allocative efficiency but not productive efficiency. C. neither productive efficiency nor allocative efficiency. D. productive efficiency but not allocative efficiency.