[uf-new] Currency brainstorming

Andy Mabbett andy at pigsonthewing.org.uk
Fri Sep 28 09:46:05 PDT 2007

In message <46FD2AD0.8080606 at brixlogic.com>, Guillaume Lebleu 
<gl at brixlogic.com> writes

>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.

I don't see any advantage in making such a distinction, nor any problem 
in not doing so,

Perhaps you could enlighten me, with real-world published examples?

Andy Mabbett

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