A lot of investors heard fear of concentration and bailed on some great stocks, says Jim Cramer

starting up again. You know the litany. The market's too concentrated.Gain just in a handful of stocks. The whole thing's a house of a card. So, sell sell.>> That was the story yesterday and we heard it again this very morning. Even as the averages open lower and then rallied through the day, Dow ultimately slipping 25 points. That's advanced 0.51% 1%.But the NASDAQ ended up gaining 1.02%. Every time the experts start ringing their hands about concentration, the market's lack of breath, lack of breath, peop ...