Come on, really? Yes. There's a great explanation from The Undercover Economist. It's a great read. Highly recommended: http://www.amazon.com/Undercover-Eco

Come on, really? Yes. There's a great explanation from The Undercover Economist. It's a great read. Highly recommended: http://www.amazon.com/Undercover-Economist-Exposing-Poor-Decent/dp/B0018SYWWU http://www.amazon.com/Undercover-Economist-Exposing-Poor-Dec... Update: Here's a link to the explanation: http://books.google.com/books?id=YAA8hPloNRcC&pg=PA30&lpg=PA30&dq http://books.google.com/books?id=YAA8hPloNRcC&pg=PA30&#3...