Why did Americas subprime mortgage woes have such a big impact on world financial markets?
Because these mortgages were lumped together in packages and sold as asset-backed securities all over the world, particularly in Europe. Often the initial securities were themselves put into new packages, leveraged up and resold as so-called collateralized debt obligations (CDOs). They are a sort of derivative play on the underlying mortgages, just as futures and options are a play on stocks and commodities. Big banks have whole securitization departments who create these instruments. They do so to profit from the difference between the long-term returns these investment vehicles produce and their more plain vanilla short-term borrowing, and to earn fees. Who bought them? Everyone, and that’s the problem. The CDO market has exploded in recent years: More than $100 billion worth of structured cash CDOs were issued in the fourth quarter of last year alone, according to CreditFlux Data+, a London firm that tracks them (and that doesn’t include the even more arcane “synthetic” CDOs). Banks
