This makes the US Federal taxation system considerably more progressive than those of most other OECD countries.

FORBES: Alan Krueger's Mistake: The US Tax Code is More Progressive Than Most Other OECD Countries

Today's system of progressive but flawed taxation of income must, they say, be ripped up by its roots.

ECONOMIST: Binning the IRS

The Uneasy Case for Progressive Taxation, an influential work addressing our tax system.

FORBES: What's The Unkindest Tax Of All?