But over time the damage will accumulate: misallocated capital, lower competitiveness and reduced faith in America’s institutions. Those who will suffer most are the very workers Mr Trump is promising to help. That is why, if he really wants to make America great again, Mr Trump should lay off the protectionism and steer clear of the bullying right now.

Mr Trump’s mercantilism is long-held and could prove fierce, particularly if the strong dollar pushes America’s trade deficit higher (see article). Congress would have only limited powers to restrain the president’s urge to impose tariffs. More important, even if rash protectionism is avoided, a strategy based on bribing and bullying individual companies will itself be a problem.

Nonetheless, Mr Trump’s approach is worrying. Unlike the Depression, when Hoover and then Roosevelt got companies to act in what they (often wrongly) saw as the national interest; or 2009, when Mr Obama corralled the banks and bailed out Detroit, America today is not in crisis. Mr Trump’s meddling is thus likely to be the new normal. Worse, his penchant for unpredictable and often vindictive bullying is likely to be more corrosive than the handouts most politicians favour.

The role of lobbyists will grow—an irony given that Mr Trump promised to drain the Washington swamp of special interests.

Such tariffs would be hugely disruptive. They would make goods more expensive for American consumers. By preventing American firms from maximising their efficiency using complex supply chains, they would reduce their competitiveness, deter new investment and, eventually, hurt workers’ wages across the economy. They would also encourage a tit-for-tat response.

American capitalism has flourished thanks to the predictable application of rules. If, at the margin, that rules-based system is superseded by an ad hoc approach in which businessmen must take heed and pay homage to the whim of King Donald, the long-term damage to America’s economy will be grave.