Quote from reactor:
LOL if I buy a share for 100 bucks, someone gets my 100 bucks and I get a share.
If the share goes up to 200 bucks and I sell it at that price, I get 200 bucks and someone is now out of pocket for 200 bucks.
That extra 100 bucks profit has come from outside into the market, but that money has come from somewhere and this is the whole point of a zero sum game. If the 100 bucks came out of nowhere, it wouldn't be zero sum.
If the markets are a positive sum game, you will always get back more than you put in, because money would be appearing from nowhere, which everyone knows is not true as the money is coming from someone else.
If the markets are a negative sum game, you will always get back less than what you put in, because the money would be disappearing into nowhere, which again everyone knows is not true, as the money is going to someone else.
Zero sum is like accounting; for every debit, there is a credit and vice versa.
Just because it is a zero sum game does not mean you can't make money. It just means you need to be skillful at extracting it from others.
It is not a zero sum game. Say tomorrow, the company is pruchased out at 250 per share.