From the
N. Y. TIMES:
The idea of basing taxes on the ability to pay dates to ancient Athens. The American tax policy has veered from two classic philosophical insights about how to finance government: "horizontal equity" and "vertical equity." Horizontal equity means that people with similar incomes and family structures pay similar amounts of tax. Vertical equity means those who have the greatest capacity to pay taxes bear the greatest burden.
QUOTE:
Mr. Bush and his wife, Laura, paid 27.7 percent of their total income in federal income taxes, about the same as the average taxpayer earning $500,000 to $1 million a year. Mr. Cheney and his wife, Lynne, however, paid 19 percent, far below the average of more than 29 percent for those in the $1 million to $2 million income group.
/QUOTE