Donald Trump is a fan of McDonald’s. But he’s unlikely to relish the Big Mac index, our quick-and-dirty guide to exchange-rate distortions. It suggests that his tariffs aren’t working.

Another of Mr Trump’s wars—the one on top universities—is an opportunity for other countries to poach American academic talent. We assess Britain’s chances of attracting embattled American professors.

And, if you’re feeling intellectual, try our mini crossword.