Wharton professor Jeremy Siegel on 3-week market decline: 'I think it's healthy'

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The S&P 500 and Nasdaq fell for their third straight one-week losses. UPenn Wharton school professor Jeremy Siegel, Steve Sosnick, Interactive Brokers chief strategist, and Nancy Tengler from Laffer Tengler Investments join 'Closing Bell' to discuss their analysis on the broader markets.