Priming the Pump: The Economic Metaphor Trump ‘Came Up With’ - Get the Upshot in your Inbox President Trump recently sat for a long interview with The Economist magazine in which he discussed his economic agenda. Explaining why he seeks tax cuts even if they risk expanding the budget deficit, President Trump said that they might increase the deficit temporarily, but that “we have to prime the pump.” “Have you heard that expression before, for this particular type of an event?” the president said. The economics metaphor is that the government might increase economic growth by pumping a little extra cash into the system, perhaps by spending money on jobs programs, or, to use Mr. Trump’s preferred policy, cutting taxes. For example, a 1933 cartoon assailing the Roosevelt administration’s spending practices was titled “What we need is another pump” and showed a desperate Roosevelt, with billions already spent, pouring more water into a pump, fruitlessly. By the time Mr. Trump was in school in the 1950s and 1960s, it was widely taught in history and economics courses as part of the story of how the United States emerged from the depression.