The ABSOLUTE worst day in ALL history to buy the Nasdaq $QQQ was March 27, 2000. $117.75 a share. The very top of the dot com bubble. By October 2002 it was $20.06. Down 82%. It took about 15 years just to get back to even... & that's WITH dividends reinvested. But if you bought that exact day & did nothing, today it's around $740. About 7x your money with dividends. Now the person who bought in October 2002 at $20... that's about 37x on price alone. Same fund. The only thing that changed was the price paid. That's why I don't buy just because something is going up. I want great companies/ETFs trading near or below fair value. YOU MUST HAVE BOTH TO HAVE A GOOD INVESTMENT 1. Great company/ETF 2. Good price