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 Contributing to an IRA? Determine if you are eligible to contribute to a traditional or Roth IRA. Best-Performing Asset Classes Bonds may outperform stocks one year only to have stocks rebound the next. Your Changing Definition of Risk in Retirement A change in your mindset during retirement may drive changes to your portfolio.