U.S. markets are poised to open with big gains, a clear sign of relief after President Donald Trump said he would not attempt to fire the head of the Federal Reserve

Stocks are on the rebound Tuesday, bouncing back from another miserable day on Wall Street. But American financial markets are sounding all sorts of alarm bells that one day in the green can hardly overcome.

So how are we enjoying the rollercoaster today? After plunging nearly 1,000 points on Monday, then surging back more than 1,000 points on Tuesday, the Dow Jones Industrial Average continued rising as markets reopened on Wednesday,