ABATEMENT, in general, is the reduction or lessening. In law, it is the termination or suspension of a lawsuit. For example, an abatement of taxes is a tax decrease or rebate.
INTEREST RATE SWAPTION is an option on an interest rate swap. It gives the holder the right but not the obligation to enter into an interest rate swap at a specific date in the future, at a particular fixed rate and for a specified term.
SUNK COST is the cost expended that cannot be retrieved on a product or service.
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