Kenneth Rogoff can pinpoint the moment he started to grow concerned Donald Trump would be the next U.S. president: It was when Rogoff's fellow attendees at the World Economic Forum's annual meeting last January said it could never happen. "A joke I've told 1,000 people in the months since leaving Davos is that the conventional wisdom of Davos is always wrong," says the Harvard professor and former chief economist of the International Monetary Fund. "No matter how improbable, the event most likely to happen is the opposite of whatever the Davos consensus is."
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