Let's imagine for a minute that we have a measurement for how "useful" a currency is (since nominal value isn't meaningful for this). Basically, how effective is that currency as a means of exchange. Now here's a specific example, how much more "useful" would the Euro become with this measurement if another country were to join the Eurozone, for instance Sweden? I would think that the Euro's utility as a means of exchange would improve, but how can that be measured?
Note that the thing you propose to measure is a function of location.
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