Quote from bitrend:
Both sides have valid arguments to approve or disapprove.
Really? Care to quote just one argument for zero sum?
But I will make it interesting! There is actually a time, when the stockmarket can be zero sum:
If the underlying company doesn't pay dividend (also no profits) and its value pretty much zero (and no expectations of sudden inventions, discoveries,etc. ) or very negative, meaning they have huge outstanding debts, THEN that particular company's stock is a zero sum game.
It usually applies to very young tech companies, that were founded on one single idea, like pets.com. They were always in the red, never paid dividends and the company's value went down the drain as they burnt through the IPO money...THAT was a zero sum game....