Diana Olick of CNBC reports on how the relatively high credit scores of today's buyers are causing the greatest loan performance in history.  In fact, just 20% of all mortgages for purchase over the last year have gone to borrowers with credit scores below 700.

In July, cash sales made up nearly 30% of total home sales, down from 34% a year before. And as the share of all-cash transactions continues to decrease, the mortgage market is ramping up--and looking for new ways to assess credit. For instance, Fannie Mae now requires lenders to use trended credit data to thoroughly analyze a borrower's credit history.

With trended credit data, lenders will have access to the monthly payment amounts that a consumer has made on these accounts over time ...

"Our aim is to help lenders serve their customers efficiently so that more qualified borrowers have access to mortgage credit. Our goal is to make sustainable homeownership a reality in communities across the country while reducing risk for taxpayers," said Timothy J. Mayopoulos, CEO of Fannie Mae, in the release.

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