Approximately how much of aggregate national income in the United States is spent on health care today?

The interest rate which the Fed charges banks that borrow reserves from it is the:

a. federal funds rate. b. discount rate. c. reserved rate. d. investment rate. e. check rate

In the principal-agent problem, the principal is:

A. a person who entrusts someone with performing a task. B. a person who carries out a task on someone else's behalf. C. a person who is in charge of an educational system. D. a person who is the source of the problem.