I Direct Your Attention, Mr. Fed Chairman, to Exhibits 1 through 10:
1. Ultra low interest rates led to a scramble for yield by fund managers;
2. Not coincidentally, there was a massive push into subprime lending by unregulated NONBANKS who existed solely to sell these mortgages to securitizers;
3. Since they were writing mortgages for resale (and held them only briefly) these non-bank lenders collapsed their lending standards; this allowed them to write many more mortgages;
4. These poorly underwritten loans — essentially junk paper — was sold to Wall Street for securitization in huge numbers.
5. Massive ratings fraud of these securities by Fitch, Moody’s and S&P led to a rating of this junk as TripleAAA.
6. That investment grade rating of junk paper allowed those scrambling bond managers (see #1) to purchase higher yield paper that they would not otherwise have been able to.
7. Increased leverage of investment houses allowed a huge securitization manufacturing process; Some iBanks also purchased this paper in enormous numbers;
8. More leverage took place in the shadow derivatives market. That allowed firms like AIG to write $3 trillion in derivative exposure, much of it in mortgage and credit related areas.
9. Compensation packages in the financial sector were asymmetrical, where employees had huge upside but shareholders (and eventually taxpayers) had huge downside. This (logically) led to increasingly aggressive and risky activity.
10. Once home prices began to fall, all of the above fell apart.
I hate having to repeat myself, but it is apparently, necessary.
Bernanke Still Does Not Understand Credit Crisis (January 4th, 2010)