Stocks just had their worst month of the year as the 'September Effect' set in. These 4 charts tell the story.

Tech Insider
FILE - In this Aug. 12, 2019, photo specialist Peter Mazza works at his post on the floor of the New York Stock Exchange. Stocks of companies that do lots of business with China are obvious targets to sell when trade worries rise, and they’ve lagged sharply behind the rest of the market whenever President Donald Trump sends out a tariff tweet.
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