Where Forex Traders Begin

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Most traders begin their trading career, whether consciously or subconsciously, visualizing "The Big One" - the one trade that will make them millions and allow them to retire young and live carefree for the rest of their lives. In forex, this fantasy is further reinforced by the folklore of the markets. Who can forget the time that George Soros "broke the Bank of England" by shorting the pound and walked away with a cool $1-billion profit in a single day? But the cold hard truth for most retail traders is that, instead of experiencing the "Big Win", most traders fall victim to just one "Big Loss" that can knock them out of the game forever.
Source: http://www.investopedia.com/articles/forex/06/FXMoneyMgmt.asp