macroeconomics

The cost-benefit principle indicates that an action should be taken
A) if the total benefits exceed the total costs.
B) based on flipping a coin or speaking with a psychic.
C) if the average benefits exceed the average costs.
D) if the net benefit (benefit minus cost) is zero.
E) if the extra benefit is greater than or equal to the extra costs.

Which of the following questions would not be part of macroeconomics?
A) What caused the great depression?
B) At what rate does the Canadian economy typically grow?
C) Did the sharp increase in gasoline prices alter SUV sales?
D) How does government spending affect the economy?
E) Do trends exist in the national rate of unemployment?

If a campus organization provides a free lunch to all students who show up, then
A) the scarcity problem has been violated.
B) the scarcity problem still applies to the decision to allocate the time to go and eat.
C) the lunch is completely without cost.
D) no trade-offs are involved.
E) it is a free lunch because no price was charged.