I was curious about what happened, too. It was the Usual Suspects, the Wall Street yobbos who created an exciting new "product," in their own terminology.
Basically they sold packages of mortgages, in three tiers. Leaving out the usual Wall St. jargon, they were packages of low-risk, medium-risk and high-risk mortgage debt belonging to you, me and John and Jane Q. Public. Those packages were "sliced up" and offered as investments.
If you can guess which tier triggered the meltdown, you're probably (over)qualified to run a major investment bank or hedge fund. Send your resume to Neil Bush immediately!
But the experts can explain it a lot better than me.
Business Week has a great long article (5 pages) explaining it all in plain English, but I couldn't find the article.
I really love this one, from The Economist:
THE symbolism is almost too perfect. According to TheStreet.com, a financial website, John Devaney, a hedge-fund manager, has put his 142-foot yacht Positive Carry up for sale, along with his 16-bedroom mansion in Aspen, Colorado. Funds run by Mr Devaney's group, United Capital, have had to halt payouts to investors after making heavy losses on mortgage-backed bonds.
Ironically, Mr Devaney's early life pointed to the excesses that were to come. He used his student credit card to buy a house, on which he took out a second mortgage...http://www.economist.com/business/displaystory.cfm?story_id=9587542 But don't expect the lenders to castigate homeowners for taking on too much risk. "It's tremendously un-PC to say this, but this entire circle of blame starts with individual borrowers who wanted more for less, wanted it big, and wanted it now," says Mason. "They got greedy."http://news.yahoo.com/s/bw/20070730/bs_bw/jul2007pi20070726003656CDOs are pools of debt instruments -- such as bonds or loans -- that are repackaged into different slices carrying various levels of risk. These slices, or tranches, are then sold to investors such as insurance companies and hedge funds. Managers hold most of the underlying debt until maturity, while monitoring and sometimes trading the securities.http://online.wsj.com/article/SB118610257427186861.html?mod=most_viewed_markets24