Mortgage rates fell again this week, bringing the average rate on a 30-year fixed-rate loan farther below 5%, according to Freddie Mac's weekly survey of mortgage rates, released Thursday.

The average 30-year fixed rate has dropped so rapidly that it is now lower than the average for a one-year adjustable loan. This is the first time the yield curve has been reversed since Freddie began collecting data for adjustable-rate mortgages in 1984.

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