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Originally Posted by sa_trader
Since when you buy a currency pair you actually sign a contract and then when you close your position you sign another contract with the same quantity but with just a diference value for each currency, you just have to have the difference between the contract values  which is your margin. Thats how I understand the market  maybe im wrong 
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So if you scalp and make like 20-30 trades per day (some last seconds) it can mean that your broker is that fast at writing contracts???!!!!