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Could be done, as long as you can define a base currency, and have a conversion the other currencies are determined off of. Our outfit does that right now, using the dollar as the base currency. Of course, the real world monetary markets fluctuate daily, but that doesn't really need to be implemented in a fantasy world, where markets tend to remain stable unless there are HUGE catastrophes.
Still, can be rather complex. I would say the two most complex problems I've dealt with in the real world have been date/time conversions (damn you UTC offsets) and currency conversions. However, once you figure it all out it is rather satisfying to sit back and watch it all work. Of course, that's because the real world is full of inconsistencies. In the fantasy world, unless you want to mimic the real world, doesn't have to apply those inconsistencies. Sort of like moon phases, if you think about it. Complex, yes, but they all follow some type of pattern that can be repeatable.
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