CBS This Morning: What's Behind the Market Sell-Off?

The markets are coming off the biggest two days of losses since February. The Dow Jones Industrial Average lost nearly 546 points Thursday, a 2.1 percent drop, on top of an 831-point plunge on Wednesday. The S&P 500 was also down 2.1 percent. I joined CBS This Morning to discuss what's behind the sell-off.

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