RUNNING RATE is a sustained constant rate, often the only important single rate except for zero observed under a given schedule (as in some ratio performances) also known as stream rate.
VARIABLE INTEREST RATE is an interest rate that moves up and down based on the changes of an underlying interest rate index, e.g. a credit card might have a variable rate that is a certain spread over the prime rate.
HARMONIZED SYSTEM is an internationally agreed upon classification system for trade. It provides code numbers to specify a goods classification; thereby making customs duty determination more predictable.
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