U.S. stocks, VIX dance in tandem in break with history

A rising U.S. stock market normally reduces fear among investors, but the blistering pace of the current rally has instead also driven up the anxiety factor in the market.The S&P 500 Index and the Cboe Volatility Index, which is the main gauge for measuring investor fears that benchmark stocks will drop in the near term, have moved in rare tandem form.On nine separate occasions this month, the VIX has matched the direction taken by the S&P 500 on a given day.