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 | Related Content Inflation and Your Portfolio Even low inflation rates can pose a threat to investment returns. Mutual Funds vs. ETFs Exchange-traded funds have some things in common with mutual funds, but there are differences, too. Impact of Taxes and Inflation Estimate the potential impact taxes and inflation can have on the purchasing power of an investment.