Capturing the Impact of Credit Rationing on Prepayment Speeds with Mortgage Big Data

A key metric in the decision regarding investment in MBS is prepayment speeds. Investors concerned about lower interest rates naturally find value in lower-prepaying pools. In looking into the drivers of differing prepayments, it’s useful to look into differences in performance for different groups of loans. Chart 1 looks at the prepayment speeds for the entire books of Fannie Mae and Freddie Mac mortgages as measured by the 1-month conditional prepayment speeds (CPR). 

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