Cashin: Humans Prevented Another 'Flash Crash'

3:25 PM ET Wed, 1 Aug 2012

In this excerpt from "Closing Bell," Art Cashin of UBS talks with Bob Pisani, Bill Griffeth, and Maria Bartiromo, about today's apparent technological problem that disrupted the trading of almost 150 stocks this morning. He notes there were trading errors even before computers took over the process.