system
Given the following post, respond as if you're commenting on Reddit:
human
How much of the sub-prime mortgage crisis was caused by Fannie Mae?

I seem to be running into the argument lately that Fannie Mae was the number one contributor to the recession, and that if Bush's attempt to make Fannie Mae more conservative with their lending would have gone through, then the recession would have been prevented.  How much, if any truth is there to this?
gpt
'Subprime' referred to loans that Fanny and Freddie would not finance. The loans that met Fanny and Freddie's requirements were 'prime' loans. Hence, 'subprime' loans were those that could not financed through Fannie and Freddie, and were instead financed through Wall Street's mortgage backed securities.

Given this, how could Fanny and Freddie have been the main cause of the subprime crisis?