But it's not so much the fresh lurch higher for the "VIX" that is a concern for Nicholas Colas, co-founder of DataTrek Research. Such spikes often signal buying opportunities for stocks ...

The halts came as the Cboe Volatility Index VIX, better known as the VIX or Wall Street's "fear gauge," tallied its biggest daily drop on record, according to Dow Jones Market Data. The iPath ...