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How to trade “exotic” currencies?
There are firms that let you do this. I believe that Saxo Bank is one such firm (note that I'm not endorsing the company at all, and have no experience with it) Keep in mind that the reason that these currencies are "exotic" is because the markets for trading are small. Small markets are generally really bad for retail/non-professional investors.  (Also note: I'm not trying to insult Brazil or Thailand, which are major economies. In this context, I'm specifically concerned with currency trading volume.)