Geary–Khamis dollar: Difference between revisions
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Only after fixing all four parameters can the unit make sense next to a number. | Only after fixing all four parameters can the unit make sense next to a number. | ||
Of these, the Geary–Khamis dollar [[wikipedia:Currying|partially fixes]] the parameters except the year. Therefore formally the Geary–Khamis dollar can be seen as a "unit schema" or "unit function" that takes a year as input and outputs an actual unit. | Of these, the Geary–Khamis dollar [[wikipedia:Currying|partially fixes]] the parameters except the year. Therefore formally the Geary–Khamis dollar can be seen as a "unit schema" or "unit-producing function" that takes a year as input and outputs an actual unit. | ||
==Difference with the US dollar for a particular year== | ==Difference with the US dollar for a particular year== | ||
Revision as of 23:38, 21 October 2017
The Geary–Khamis dollar (also known as the international dollar) is a hypothetical currency.
As a function
Currency conversions involving PPP can be conceptualized as a 4?-place function taking as parameters:
- The source currency
- The target currency
- The location with respect to the PPP calculation?
- The year
Only after fixing all four parameters can the unit make sense next to a number.
Of these, the Geary–Khamis dollar partially fixes the parameters except the year. Therefore formally the Geary–Khamis dollar can be seen as a "unit schema" or "unit-producing function" that takes a year as input and outputs an actual unit.
Difference with the US dollar for a particular year
e.g. 2000 GK dollar vs 2000 US dollar
See also
External links
- Geary–Khamis dollar (Wikipedia)
References
Script error: No such module "Check for unknown parameters".