Why is volatility SO important to trading ?

Each week, investors and financial professionals around the globe turn to John Mauldin to better understand Wall Street, global markets, and the drivers of the world economy. And for good reason. John is a noted financial expert, a New York Times best-selling author, a pioneering online commentator, and the publisher of one of the first publications to provide investors with free, unbiased information and guidance—Thoughts from the Frontline—one of the most widely read investment newsletters in the world.