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The stock market is an excellent example of a positive-sum game, often erroneously labelled as a zero-sum game. This is a zero-sum fallacy: the perception that one trader in the stock market may only increase the value of their holdings if another trader decreases their holdings.
Speculation operates as a zero-sum game where profits come at other traders' expense. Investing generates real wealth through ownership of productive businesses that create value through products ...
Source: Aaron Friedman. Some say the stock market and investing are just like gambling, but the best investor in the world, Warren Buffett, doesn't think so. ... gambling is a zero-sum game, and ...
It's a stock split, and after years of the market ignoring the practice, it seems as if the zero-sum game is back in fashion. Splitting Headache A stock split doesn't change anything -- in theory.
Constant sum: A game is a constant sum game if the sum of the payoffs to every player are the same for every single set of strategies. In these games, one player gains if and only if another player loses. A constant sum game can be converted into a zero sum game by subtracting a fixed value from all payoffs, leaving their relative order unchanged.
Sharpe's proposition argues that, before costs, the average active manager must earn the market return; therefore, after costs, the average active manager will earn less than the market. As a result, according to Sharpe, active investing is a zero sum game before costs and a negative sum game after costs.
In zero-sum games, the total benefit goes to all players in a game, for every combination of strategies, and always adds to zero (more informally, a player benefits only at the equal expense of others). [20] Poker exemplifies a zero-sum game (ignoring the possibility of the house's cut), because one wins exactly the amount one's opponents lose.
Matching Pennies is a zero-sum game because each participant's gain or loss of utility is exactly balanced by the losses or gains of the utility of the other participants. If the participants' total gains are added up and their total losses subtracted, the sum will be zero.