The non-partisan Congressional Budget Office (CBO) just released a working paper entitled An Evaluation of Large-Scale Mortgage Refinancing Programs in which it analyzed a large-scale program that would relax current income and loan-to-value restrictions for borrowers who wish to refinance mortgages currently held by Fannie Mae, Freddie Mac, or the Federal Housing Administration. The analysis uses an estimate of the increased refinancing that would occur and how future default and prepayment behavior...