Quote from Pekelo:
Now for extra fun, I mention again, that stocks CAN BE zero sum games. When there is no dividends paid AND the company's value doesn't change in either way (if that actually happens is a different question, let's say my company in its first 2 years in the example ), then it is a zero sum game....
Divedend paid and/ or the appreciation or depreciation from the original issuing price is what makes it a zero sums game. For ever dollar the stock goes up from the ipo price, the company loses 1 dollar due to their liability to the shareholder, for every dollar that it moves down, the company has gained that dollar at the shareholders expense. No matter how you look at it in stocks, someone is always profiting at the expense of others due to the fact that the stock that is orignally issued is "technically a short position " due to the liability it is to the company.