The marathon run comes amid signs the US economy has accelerated this year after a long period of slow but steady growth. Experts say trade wars and higher interest rates are among potential threats to the persistence of the bull run.
Investing in stocks remains concentrated among the wealthiest, with many Americans still hesitant to buy stocks following the 2008 financial crisis.
The current bull market began amid the emergency steps taken by the Federal Reserve, which set ultra-low interest rates and sought to spur investment further with billions of dollars in bond purchases in a program known as "quantitative easing".
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