You and your friends watch a movie in your bedroom. For you and your friends, the enjoyment that you get from watching the movie is not rival in consumption

Current macroeconomic models use microeconomic principles because

A) they use the same language for all economists. B) they highlight the sociological aspects of production. C) the behavior of economic agents changes with policy. D) we live in a democratic society and everybody has a say.

Using the interest rate as a measure of the opportunity cost of holding money, the demand for money curve

A) slopes upward with respect to the rate of interest. B) is not affected by the price level. C) slopes downward with respect to the rate of interest. D) is vertical.