It’s tempting to see other countries eliminating their tariffs on American goods in exchange for merely less-punitive tariffs from America as a triumph of Trumpian trade toughness. It is not. The rash of new levies coming into force will hurt America. We lay out why in our leader.

And British claims to being a world-class knowledge economy can have the ring of protesting too much. Yet they are true: Britain is especially strong in materials, life sciences and digital technologies. But its champions often move abroad, if they are not bought by a global giant. Britain needs to believe its own hype, and make it easier for those companies to thrive at home.

Moving from knowledge economies to knowledge of The Economist: test your skills with Dateline, our weekly archive quiz.