Prime
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Prime rate or Prime Lending Rate is a term applied in many countries to a reference interest rate used by banks. The term originally indicated the rate of interest at which banks lent to favored customers, i.e., those with high credibility, though this is no longer always the case. Some variable interest rates may be expressed as a percentage above or below prime rate.
The prime rate is used often as an index in calculating rate changes to adjustable rate mortgages (ARM) and other variable rate short-term loans. It is used in the calculation of some private student loans. Many credit cards and home equity lines of credit with variable interest rates have their rate specified as the prime rate (index) plus a fixed value commonly called the spread or margin.
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