Concerns about the health of American business are many and varied. Chief executives are chastised for their apparent short-termism. Their companies are berated for fetishising shareholders over everyone and everything else. Elon Musk, boss of Tesla, a maker of electric cars, grumbles about a surfeit of business-school graduates stifling innovation. President Joe Biden frets as much about American companies losing out to China as Donald Trump did (albeit with less bile). He also worries about the concentration of power among America’s biggest firms.