Why It's Wrong to Hold Too Much of One Stock - WSJ.com

Why It's Wrong to Hold Too Much of One Stock - WSJ.com: "hey think they're reducing risk and optimizing gains by following the adage, 'Invest in what you know.' Yet too much concentration in one stock actually increases risk...David Hirshleifer, a finance professor at the Paul Merage School of Business at the University of California, Irvine, says people have a natural tendency to like things