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How to Make Money in Stocks: A Winning System in Good Times and Bad, Fourth Edition, 4th Edition by William O'Neil

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CHAPTER 13Twenty-One Costly Common Mistakes Investors Make

Knute Rockne, the famous winning Notre Dame football coach, used to say, “Build up your weaknesses until they become your strong points.” The reason people either lose money or achieve mediocre results in the stock market is they simply make too many mistakes. It’s the same in your business, your life, or your career. You’re held back or have reverses not because of your strengths, but because of your mistakes or weaknesses that you do not recognize, face, and correct. Most people just blame somebody else. It is much easier to have excuses and alibis than it is to examine your own behavior realistically.

When I first wrote this book, I came across lots of people who were advising: “Concentrate ...

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