YESTERDAY in Detroit Donald Trump gave a much-anticipated speech on the economy. It was billed as setting out Mr Trump’s economic agenda for America; its political function was to move media coverage on after a disastrous week for Mr Trump (see article). On policy, the speech did two almost contradictory things. First, it brought Mr Trump closer to the position of congressional Republicans on tax and regulatory policy. Second, it reiterated Mr Trump’s desire to tear up America’s trade agreements (a position most congressional Republicans hate). Yet Mr Trump left many gaping holes in his economic plan.