Discount Factor

Discount Factor is a
direct subtype of Spot Price with functions Discount Factor Functions, keys Discount Factor keys and example object DF#2 that represents in Deriscope usage the commonly known "discount factor" of a particular Currency with respect to a given maturity.
Being of type
Quotable it may be assigned a number, which is to be interpreted as the current worth - in same currency terms - of receiving one unit of the associated currency at maturity.