The idea of margin (leverage) and floating loss is another important trading concept and is perhaps best understood using an example. Most retail Forex market makers permit 100:1 leverage, but also, crucially, require you to have a certain amount of money in your account to protect against a critical loss point. For example, if a $100,000 position is held in EURUSD on 100:1 leverage, the trader has to put up $1,000 to control the position. However, in the event of a declining value of your positions, Forex market makers, mindful of the fast nature of forex price swings and the amplifying effect of leverage, typically do not allow their traders to go negative and make up the difference at a later date. In order to make sure the trader does not lose more money than is held in the account, forex market makers typically employ automatic systems to close out positions when clients run out of margin (the amount of money in their account not tied to a position). If the trader has $2,000 in his account, and he is buying a $100,000 lot of EURUSD, he has $1,000 of his $2,000 tied up in margin, with $1,000 left to allow his position to fluctuate downward without being closed out.