The position of a demand curve is unaffected by changes in the price of the good

Which of the following contributed to the sharp increase in Federal tax revenues between 1995 and 2001?

A) an increase in income tax rates B) a sustained economic expansion C) increased income inequality D) all of the above

If a principal and agent have an efficient contract, then

A) one of them must be more risk-averse than the other. B) neither can be made better off without harming the other. C) they must have symmetric information. D) the principal bears more of the risk.