What would it be called if someone converted like a million dollars (US) into some other country's money - something that is worth the same as a US dollar and waited until the value of that other currency went up slightly and then reconverted it back to USD making a little bit off the exchange?
I mean, if you converted $1,000,000 into let's say the Yen and waited for it to go up two cents and then converted it back to USD, you'd make like $20,000.