The foreign exchange market is a zero sum game in which there are many experienced well-capitalized professional traders (e.g. working for banks) who can devote their attention full time to trading. An inexperienced retail trader will have a significant information disadvantage compared to these traders.Retail traders are - almost by definition - undercapitalized. Thus they are subject to the problem of gambler's ruin. In a "Fair Game" (one with no information advantages) between two players that continues until one trader goes bankrupt, the player with the lower amount of capital has a higher probability of going bankrupt first. Since the retail speculator is effectively playing against the market as a whole - which has nearly infinite capital - he will almost certainly go bankrupt. The retail trader always pays the bid/ask spread which makes his odds of winning less than those of a fair game. Additional costs may include margin interest, or if a spot position is kept open for more than one day the trade may be "resettled" each day, each time costing the full bid/ask spread.