From a Buddhist perspective, I believe the Buddha was fine with wealth and earning "interest" on one's wealth as long as it was earned legally and ethically, and as long as the lender is not lending at usurious rates, or harming others for their own personal gain. Of course the stock market is far more complex than the lender/debtor relationships of 2000+ years ago.
He advised against doing business or lending to businesses that harm others. Many seemingly innocuous and mainstream companies also sell weapons, and would therefore be violating
ahimsa - I would see companies such as GE, Dow chemicals, Monsanto as particularly unethical. Apple may also be unethical from a Buddhist perspective, as it pays its workers so poorly and amasses great wealth as a result, which is a not a very spiritual approach to doing business.
I'm investing in all these companies via the stock market indices. When I first started investing I looked at ethical mutual funds, and found they avoided certain things but not everything that I found unethical. Plus the earnings were very low, and fees were high.
I suppose I've reasoned this double standard away by knowing that I have to interact with this world the way it is. My involvement as an investor will allow me freedom to do better things in the world, and my lack of involvement, I believe, wouldn't make any difference. I'm not purposefully investing in these companies individually anymore. At one point I owned some GE stock, but later sold it because of the weapons issue. My own money used to purchase stocks and funds was earned ethically, and the money earned from investments is an imperfect solution to the problem of living in and interacting with an unethical world. There are things I can control on a day to day basis, and that is where I choose to make a difference. It would not benefit the world in any way for me to need to be tied to a desk for 50 hours a week. My investments are a tradeoff for being able to put more energy, more consciously into the world.
Here's an article about Buddhism and wealth that I found somewhat helpful:
http://www.buddhisma2z.com/content.php?id=452For years I believed it was us against them. The evil corporations taking advantage of innocent people; the 99% vs the 1%; good vs evil; polluters vs environmentalists and social activists; greed vs. giving. I don't believe this anymore, and I've found the victim mentality I used to have (i.e. that I needed to fight, to resist, to forgo anything tainted by greedy corporate interests) only perpetuated a cycle of harm on myself. Ahimsa includes self harm. My protection against this cycle was dropping the us vs. them labels in my mind. Now as an investor, I'm personally involved in the dirtier side of our civilization, but I don't feel the anger or victimization anymore. The potential for wealth and access to wealth is, though difficult for many, essentially ethically neutral in our society. It is my own intention for what to do with this wealth that has an ethical charge, and I choose to use it in the most conscious, helpful way that I can.