It is impossible to foresee, with a 100% guarantee, how exchange rates will move because the forex market is quite unsteady. Changes in the foreign exchange rate between the time you place the trade and the time you close it out influences the price of your forex contract and the future profit and losses related to it. There is no main marketplace! The forex dealer determines the execution price, so you are relying on the dealer's honesty for a fair price. As unlike adjusted futures exchanges, in the retail off-exchange forex market there is no main marketplace with lots of buyers and sellers.
