As long as there are market regulations, and as long as people have some kind of morals the market will stay a long ways from being perfectly efficient. Any pro

As long as there are market regulations, and as long as people have some kind of morals the market will stay a long ways from being perfectly efficient. Any profit-making trade that you can't make because of legal or ethical reasons shows a crack in the efficient market. That may not be a bad thing, but it's so important that we recognize these imperfections and keep them patched so that they're not exploited.