My FiL said this past week that the rebound from stocks being way down is great, because your retirement plan can buy more stocks for the same price, so when the price goes up your portfolio rises even more? (I.e buying 1 stock at $100 vs 2 for $50 each, for a total of $100). My thinking is if my $100 stock doubles I have $200, and if my two $50 stocks double I also have $200.