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Get interest on $100K by spending only $2K using FOREX rollovers?
Now, is there any clever way to combine FOREX transactions so that you receive the US interest on $100K instead of the $2K you deposited as margin?  Yes, absolutely. But think about it -- why would the interest rates be different? Imagine you're making two loans, one for 10,000 USD and one for 10,000 CHF, and you're going to charge a different interest rate on the two loans. Why would you do that? There is really only one reason -- you would charge more interest for the currency that you think is less likely to hold its value such that the expected value of the money you are repaid is the same. In other words, currencies pay a higher interest when their value is expected to go down and currencies pay a lower interest when their value is expected to go up. So yes, you could do this. But the profits you make in interest would have to equal the expected loss you would take in the devaluation of the currency. People will only offer you these interest rates if they think the loss will exceed the profit. Unless you know better than them, you will take a loss.