How is the stock market NOT zero-sum?

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There are many instances where the equity markets DO NOT represent a zero sum game.

While most trading represents zero sum activity you must remember how the shares came onto the market in the first place. Mostly they became tradeable via IPOs' and those are most definitely NOT zero sum transactions.

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True, but we're talking about typical secondary market trading (I wrote about the exceptions earlier). Anything that affects the employees or management is not zero-sum. Also, these activities do not generally affect the rest of us.