Which of the following is not a significant source of revenue for the U.S. Federal government?

Suppose consumers anticipate that their wealth will grow over time, because of interest earnings and capital gains. According to the life-cycle hypothesis, such optimism should cause current consumption to be ________

A) relatively low B) relatively insensitive to changes in income C) rising as individuals near retirement age D) relatively high

How do high marginal tax rates influence the growth and prosperity of countries? What type of tax policy is needed to foster economic efficiency and growth?