Donald Trump’s supporters celebrate him as a man who says what he means and means what he says. The trade crisis he ignited over the past week has provided more proof, if any was needed, that this reputation is undeserved. Yes, Mr Trump has been clear that he loves tariffs, but he is vague and even misleading about what this ardour means in practice. That has made for a remarkably chaotic start to his new administration, with businesses, investors and other governments all trying to figure out exactly what he wants—and most now bracing for more turbulence.