A primer on the global derivatives market, the City of London, and the credit crunch:

"In 2003 the total size of the world economy was $49,000,000,000,000. The total size of the derivatives being traded was $85,000,000,000,000. In other words, derivatives today are worth far, far more than the total economic activity of the planet. More than $1,000,000,000,000 of derivatives are bought and sold every day. Every single thing that can be traded through derivatives, is."