Actually Wall Street thinks just as the Greeks did. The early Greeks used to sit around for days and debate how many teeth a horse has. They thought they could figure it out by just sitting there, instead of checking the horse. A lot of investors sit around and debate whether a stock is going up, as if the financial muse will give them the answer, instead of checking the company.

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It’s when you’ve decided to invest on your own that you ought to try going it alone. That means ignoring the hot tips, the recommendations from brokerage houses, and the latest “can’t miss” suggestion from your favorite newsletter — in favor of your own research. It means ignoring the stocks that you hear Peter Lynch, or some similar authority, is buying.

As far back as 1602, Dutch people were buying shares in the United Dutch East India Company. This was the world’s first popular stock, sold on the world’s first popular stock exchange, which operated from a bridge over the Amstel River in Amsterdam. Crowds of eager investors gathered there, trying to get the attention of a stockbroker, and when their pushing and shoving got out of hand, police were called in to restore the peace.

To make this spectacular showing, you only had to find one big winner out of eleven. The more right you are about any one stock, the more wrong you can be on all the others and still triumph as an investor.

Once I’ve established the size of the company relative to others in a particular industry, next I place it into one of six general categories: slow growers, stalwarts, fast growers, cyclicals, asset plays, and turnarounds.