From Bob Doll’s weekly commentary:
…Despite its longevity and strength, we don’t believe the current bull market is approaching an end. The U.S. remains in an environment of solid growth and easy monetary policy. We think we would need to see some combination of economically damaging political turmoil, decisively higher bond yields and/or a material drop in the value of the dollar to cause an end to this bull market. None of those events appear particularly likely.