Frances Berriman wrote:
Interesting. Would date/time sensitive money in the case of stocks
and shares apply in this way too, do you think? Or would that be
reliant on publish date of where the information is displayed? (Not
that I know much about S&S, just occurred to me it's a much more
common varying value)
IMO, we must conceptually distinguish the notion of *money amount* and
the notion of *price*. A money amount is an amount of a given number of
units of currency. A price is an equivalence relationship typically
between a money amount and another amount in any measurement unit. Some
prices are expressed without using currencies. Some prices are prices of
one currency in another one (as in 1 euro = 1.41 dollars).
The amount+unit is not a relation and does not change over time, and
does not have to be dated.
A price does change over time, and should be dated.
In Andy's example above, the date is not a property of the "hmoney"
class, but of a TBD "hprice" class.
Guillaume
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