It Was the Best of Times, It Was the Worst of Times All about how missing the best market days (or the worst!) might affect your portfolio. Share | Have A Question About This Topic? Name Email Address Message Thank you! Oops! Related Content 16 Wall Street Cliches in 60 Seconds Pundits say a lot of things about the markets. Let's see if you can keep up. A Look at Diversification Diversification is an investment principle designed to manage risk, but it can't prevent against a loss. What Is the Dividend Yield? This calculator helps determine your pre-tax and after-tax dividend yield on a particular stock.