FNM and FRE mortgages have basically been the "standard".. currently over 90% of all new issued mortgages are issued thru FRE and FNM, and as government keeps buying the GSE papers they support mortgage rates to be artificially low and keep housing market afloat.
The problem is they have been doing this more and more over the last 20 years or so..
This is only only of the things that caused the housing market bubble..

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Человек, который почувствовал ветер перемен, должен построить не щит от ветра, а ветряную мельницу