Quote from Pekelo:
It is amazing how much missunderstanding is among stocktraders about the very instrument they are trading. Only 2 people mentioned so far 2 very important characteristics of stocks that options and futures don't have, but it changes the logic of it, when we are examining if it is a zero sum game or not:
1. Dividends.
2. Ownership.
Dividens means that even if no stocks change hands, but there is dividend paid to the stockholders, there is wealth created by the underlying company. So clearly, here we are not talking about a closed system (just buyers and sellers), because money is coming in from the outside. So you can throw out the zero sum game right now.
Ownership itself doesn't really have an effect on the zero sum problem, although it must be noted that when the company has a positive value, the stockprice can not go much below a certain value, otherwise the shares would be bought up and the company sold with a profit. In zero sum games, the value of the traded part of the game usually can go to zero.
Options although we think of them as trading vehicles, originally were created for insurance purposes, thus the problem of a wasting asset although exists, but doesn't bother the insurance buyer. They are zero or negative games, depending on how many transaction occurs.
Futures are zero sum games without counting comissions and slippage, otherwise they are sligthly negative games...