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. Related Content Paying Off a Credit Card Enter various payment options and determine how long it may take to pay off a credit card. How Compound Interest Works Use this calculator to better see the potential impact of compound interest on an asset. Inflation and the Real Rate of Return Learn about the role of inflation when considering your portfolio’s rate of return with this helpful article.