Trump's power to fire a crucial presidential appointee should frighten investors

Carlos Barria/Reuters; Composite by Bob Bryan/Business Insider It's impossible to know how President Donald Trump truly feels about Federal Reserve Chair Janet Yellen because, as he does so often, he has both bashed and praised her depending on his whim. During hiscampaign, Trump said Yellen was doing a good job but would not renominate her because she is a Democrat, a clear violation of the basic principal of central bank independence from politics. Later, when the campaign was heating up, Trum...