Should companies be hiring or firing? Demand for workers has roared back over the past two years. But labour supply has not kept pace, and shortages are pervasive. That means many firms need to hire. On the other hand, fears of recession are widespread. Some bosses suspect they already have too many workers. Mark Zuckerberg has told Facebook employees that “there are probably a bunch of people who shouldn’t be here”. Tim Cook, the head of Apple, takes the middle course. Apple will continue to hire “in areas”, he said recently, but he was “clear-eyed” about the risks to the economy.