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 Question Thank you! Oops! Related Contents How Compound Interest Works Use this calculator to better see the potential impact of compound interest on an asset. Saving for College This calculator can help you estimate how much you should be saving for college. Impact of Taxes and Inflation Estimate the potential impact taxes and inflation can have on the purchasing power of an investment.