Alcoa had a monopoly in the U.S. aluminum market from the late nineteenth century until the end of World War II. Which barrier to entry was the source of Alcoa's monopoly power?

By the 2000s, an important market change occurred when investment banks became significant participants in the secondary market for

A) corporate bonds. B) currency. C) mortgages. D) Treasury securities.

Which type of demand for money causes the demand for money curve to slope downward?

A. speculative demand B. precautionary demand C. transactions demand D. foreign-exchange demand