How is an index and margin used in an ARM?

An index is an economic indicator that lenders use to set the interest rate for an ARM. Generally the interest rate that you pay is a combination of the index rate and a pre-specified margin. Three commonly used indices are the One-Year Treasury Bill, the Cost of Funds of the 11th District Federal Home Loan Bank (COFI), and the London InterBank Offering Rate (LIBOR).

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