In "Wall Street Lessons," James E. Demmert shows you how to become a disciplined, rational investor. You will learn how to avoid 13 of the most common psychological investment blunders you might be driven to make due to fear, greed, or both. Today’s Wall Street is fast-paced, chaotic, and unpredictable, and so you will see why many popular investment theories, such as modern portfolio theory (with its “diversify” and “buy and hold” strategy) no longer work.