Actually, it's a negative sum game, because of commissions and bid-ask spread.Quote from Pa(b)st Prime:
"Few other fields have more published rules and guidelines than trading. After all, there's no Idiots Guide To Trial Defense. We've been inundated for decades with the old saws about cutting losses quickly and letting winners run. Still we see little improvement in the trading performance of most participants. Futures trading is truly a zero sum game. "
http://www.tradingmarkets.com/.site/stocks/commentary/editorialarticles/-76549.cfm
