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It's patently false the claim that individual investors generally don't beat the market, or that the ones that do only do so by chance. Warren Buffet, a very famous investor you may have heard of, even mentions that he knows plenty of small individual investors who follow many tenets of the philosophy of value investing and they have consistently beat the market. I, personally, have been individually investing, following the principals of value investing, knowing the companies I invest in, and asset allocation, diversification across industries, and I have slaughtered the market for over 20 years. All the points he raised in the article are valid, but they read like pop culture one liners. If you are serious about investing I recommend reading Ben Graham's Intelligent Investor and Security Analysis, and follow along with Buffet's letter to shareholders. Understanding the stock market takes time, and you won't find the answers in a 1000 word blog post. |
So, the only reason not to trade is that you should expect to do exactly as well as the market and pay a bunch of transactions costs which makes you strictly worse off, but the Buffet approach doesn't pay more than you would have anyway.
A point not mentioned is that individual investors can have planning horizons 3 to 50 years long while a lot of Wall Street money is on a 3 month put up or shut up investment time frame. Strategies that take a long time to mature are tough to do when you can get performance-fired for not having your thesis pan out fast enough. You don't have that restriction with your own money.