how currency works? can money be earned by buying and selling at right time?

Australia
February 5, 2007 10:01pm CST
hi everybody ,as im going deep into earning money techniques so im also looking for different ways to earn money. i have a querry ,can money be earned by buying some currency when its at its low point and sell when on top ??? is this a legal way can this be done or not? any suggestions?
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