Source: Freddie Mac
Release: Primary Mortgage Market Survey
Margin is a fixed amount added to the underlying index to establish the fully indexed rate for an ARM.
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Freddie Mac, Margin for 5/1-Year Adjustable Rate Mortgage in the United States [MORTMRGN5US], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/MORTMRGN5US, July 16, 2018.