The Dow Jones Industrial Average sank nearly 1,200 points Thursday, deepening a weeklong global market rout caused by worries that the coronavirus outbreak will wreak havoc on the global economy. The S&P 500 is now 12% below the all-time high it set just a week ago. The S&P 500 fell 137.63 points, or 4.4%, to 2,978.76, its biggest one-day drop since 2011. Besides a sharply weaker Chinese economy in the first quarter of this year, he sees lower demand for U.S. exporters, disruptions to supply chains and general uncertainty eating away at earnings growth. Before the virus worries exploded, investors had been pushing stocks higher on expectations that strong profit growth was set to resume for companies.