A resurgence in trade tensions between the U.S. and China squeezed some of the excess out of an enthusiastic market, something investors will keep a close eye on in the week ahead as earnings loom. The government shutdown is also stretching into a new week. Stocks sold off Friday, with the Dow Jones Industrial Average closing nearly 900 points lower after President Donald Trump threatened higher tariffs on China, a worsening of trade relations between Washington and Beijing that the market had largely priced out since April. The S & P 500 lost more than 2%. The Nasdaq Composite slid more than 3%. Wall Street will now watch to see whether investors will continue to buy the dip, as they have done, in a market that remains near all-time highs. Or, if the threat is the start of something worse

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