The Dow Could Do Something That Hasn't Happened Since 1971

The Dow and S&P 500 don't always move in lockstep, but the divergence between the two indexes on Tuesday was getting into historic territory. The Dow was up just about 1% with a gain of more than 500 points. If the Dow finishes up 1% or more and the S&P 500 falls, it would mark the first time that's happened since Aug. 23, 1971, according to Dow Jones Market Data.