Extended-hours trading is nothing new, but with more brokers offering 24/5 access, the stock market is becoming more global, accessible—and potentially volatile.

Wall Street is hanging near its record after companies turned in a mixed set of profit results. The S&P 500 slipped 0.1% in early Friday trading, a day after pulling away from its all-time high. The Dow Jones Industrial Average fell 0.

U.S. stock indexes are falling sharply Friday after reports showed worries about President Donald Trump’s policies may be hitting the U.S. economy. The S&P 500 was down 1.3% in afternoon trading and on track for its worst day in weeks.

The retailer serves as a barometer for consumer spending due to its scale and commanding market share of the U.S. retail industry.

A sharp slide for Walmart on Thursday helped pull Wall Street off of its record. The Standard & Poor's 500 slipped 0.4% for its first drop after setting all-time highs in each of the last two days. The Dow Jones industrial average lost 1%,