it's not a zero sum game. The definition of zero sum games is "A situation in which one's gains result only from another's equivalent losses.". There are many a

it's not a zero sum game. The definition of zero sum games is "A situation in which one's gains result only from another's equivalent losses.". There are many aspects of a stock market that make it NOT sum to zero: the fact that things can go up or down in value with no one buying/selling (aka GAPS) itself makes it a positive/negative sum game. Not to mention taxes, broker costs, IPOs and all other 'game moves' that inject and/or take money out of the 'game'.