John Mauldin asked some of the best minds in the investment business to write about the ”one thing” they had learned over their many years that they want investors to know about investing and making money. Rather than being research orientated and technical in nature, the “one thing” discussed by each seasoned and very successful investment professional is based specifically on the knowledge they have accumulated over the years. Each expert’s experiences and advice are carefully distilled into separate, easy-to-grasp, essays—so that investors of all levels can understand and implement the strategies revealed. Besides discussing a single investment principle, each contributor also shares their experiences in the markets, so that readers can learn how to take advantage of profitable opportunities as well as avoid costly pitfalls.