Market Sell-off Extends the September Slide: China and the Evergrande Effect -- What Investors Should Do Now. Plus, Treasury Secretary Yellen’s Debt Ceiling Warning, Pfizer's New Data on COVID Vaccines for Kids, and U.S. Plans to Ease Travel Restrictions.

Squawk on the Street - Market Sell-off Extends the September Slide: China and the Evergrande Effect -- What Investors Should Do Now. Plus, Treasury Secretary Yellen’s Debt Ceiling Warning, Pfizer's New Data on COVID Vaccines for Kids, and U.S. Plans to Ease Travel Restrictions.