Exchange rate of Gil?

[Masamune·1600]

You can't find a real world equivalent. Look, for example, to FFVII. We see the villa sold for 300,000 gil, which would seem to suggest relative similarity between the gil and dollar. At least, one can interpret that as such. However, we see that a "Today's Special" meal at the restaurant in Wall Market costs 70 gil, which certainly seems very extravagent given the appearance of the restaurant. These are at least somewhat compatible with real world purchases, yet we see a disparity in exactly what a given amount of gil is able to do. Even if you disagree with my assessments of the costs, it should be clear that there is a disconnect between the monetary value of gil and that of any actual currency.

A dagger in FFI, with its cost of 5, is certainly deceptive. Weapons purchased in other areas cost much more. The low price at the beginning of the game is as such simply so one has a means to arm his characters. As I see it, the best one can do in determining the value of gil in actual monetary terms would be to apply a range.