President Donald Trump’s practice of policy making by tweet sowed unpredictability for businesses and investors. Yellen’s tenure at the Fed -- as chairman, vice-chairman, governor, and San Francisco Fed president -- means that she’s keenly aware of the market impact of her words, a stark contrast with senior Trump administration officials.
“The markets love this appointment because being the former Federal Reserve chair, there’s no surprises about her thinking,” said Peter Mallouk, chief executive officer of Creative Planning.
Yellen comes as something of a relief to Wall Street after talk of Biden choosing Senator Elizabeth Warren, a nemesis of big banks with a preference for stronger financial regulation, as his Treasury chief.