That market was created by the liberal/left, when Bill Clinton appointed Franklin Raines head of Fanny Mae with marching orders to crank out billions of dollars in home loans to unqualified borrowers from his minority constituencies. He was taking his cue from leftwing groups like ACORN which had successfully threatened some banks into making such loans. Seeing the money FM was making (Raines walked away with $900 million) the banks joined in. Don't confuse the proximate "cause" with the REAL cause - leftwingers meddling in markets, the same way they created the Great Depression in the 1930s.
Please Rick, don't be angry but as an eye witness to the birth of the housing bubble, a couple corrections are necessary here...
The creation of the housing bubble was bipartisan. I remember watching C-Span in the late 90's while Clinton was still in office and there was a meeting with the comptrollers of Fannie and Freddie, Government Sponsored Entities (GSE's). The bipartisan panel asked the two firms about raising their holdings of sub-prime mortgages (SPM's).
Both comptrollers stated that according to well established standards for the industry, sub-prime mortgages should not account for more than 1% of the company's portfolio. They were simply too volatile.
The bipartisan panel stated their interest in having the GSE's raise their sub-prime holdings to 10% of their portfolio. The comptrollers adamantly requested that the panel reconsider such a move and stressed the financial dangers involved in such a decision.
The panel assured the comptrollers that, as GSE's, they would be well insured against financial disaster, claimed that fears over increasing the holdings of SPM's would be shown to be unfounded, and said that the increase was necessary to promote affordable housing.
Being GSE's, Fannie and Freddie had no choice, their SPM cap was soon raised to 10% of their portfolio.
A few years later, after Bush was elected, I again watched on C-Span as the panel dragged the GSE's comptrollers back to ask about SPM's. The comptrollers reported that things were going well but cautioned that the panel should consider allowing SPM's to return to 1%. The panel would have none of that.
Bush saw the "success" Clinton had in "affordable housing" and agreed with the panels suggestion to raise the cap again, this time to 25%. To say that the comptrollers freaked out would be to put it mildly but once again, they had no choice.
Now as Clark pointed out, Fannie and Freddie were not the ones out making loans, the privately owned banks did that. Fannie and Freddie were merely a dumping ground for these SPM's. They told the banks they needed to meet a quota of 10%, the banks issued loans and sold the SPM's to Fannie and Freddie. This happened each time the cap was raised and didn't stop till the house of cards collapsed.
Banks didn't want to hold onto SPM's because of their volatility, so they were glad to pawn them off on the GSE's. The GSE's didn't want them either and for the same reason, but they had a quota to meet and assurances from the government that they would be safe in the event of a collapse.
Now once the GSE's met their quota, they stopped buying the SPM's from the banks, leaving banks with volatile holdings. That's when some financial genius decided it would be a good idea to carve up individual loans and splice them back together, take a % of a high risk loan with a % of a medium risk loan and a % of a low risk loan, and the mortgage backed security was born.
The rest, as they say, is history.
Ok... Now as to Franklin Raines. He split the scene with 90 million, not 900 million.