#interest_rate__rate_of_interest  the percentage of a sum of money charged for its use
  supertype:  charge_per_unit__rate  amount of a charge or payment relative to some basis; "a 10-minute phone call at that rate would cost $5"
  subtype:  discount__discount_rate__bank_discount  interest on an annual basis deducted in advance on a loan
     subtype:  bank_rate  the discount rate fixed by a central bank
  subtype:  discount_rate  (US) the rate of interest set by the Federal Reserve that member banks are charged when they borrow money through the Federal Reserve System
  subtype:  prime_interest_rate  the interest rate on short-term loans that banks charge their commercial customers with high credit ratings
  subtype:  vigorish__usury  an exorbitant or unlawful rate of interest

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