Stock markets have rocketed higher since the election of U.S. president Donald Trump, despite fears emerging that Trump is feeding an asset price bubble. The S&P 500, the Dow Jones Industrial Average and the tech-heavy Nasdaq have all notched record highs since November,

The S&P 500 flirts with a record as U.S. stock-market investors return from a three-day weekend, awaiting minutes from the Federal Reserve's January meeting and data due later this week.

U.S. stock indexes are wavering on Wall Street Wednesday. The S&P 500 was mostly unchanged, a day after setting an all-time high. The Dow Jones Industrial Average was down 122 points, or 0.3%, as of 12:18 p.