Distinguished Professor of Economics at the Graduate Center of the City University of New York and winner of the Nobel in Economic Sciences Paul Krugman would disagree with you. He's full of economic pronouncements going as far as when markets are going to crash (immediately) and their specific cause (Trump elected).

You can make the case that as a columnist, he's encouraged to make predictions but most Keynesians believe in direct cause -> effect of policy decisions based on a handful of metrics that properly describe the economy as a whole.