This essay takes a broader view of Manias, Bubbles, Panics, and Crashes by expanding on these terms, considering the benefits of studying stock market bubbles, and looking for commonalities that mark each phase of a euphoric price cycle.  The most practical reason to study bubbles and crashes is the simple fact that they appear far more often than one might expect. Rational investors may be inclined to dismiss the periodic appearance of bubble conditions as just so much noise and frivolity, leaving us to focus on real world issues like the economy, profits, and expected returns. However, we believe the impact of manias and crashes on investment performance over an entire career is significant to the point of being decisive, and that is the most compelling reason to study the history of financial manias.