In a recent book, The Hard Thing About Hard Things, the tech investor Ben Horowitz adds a twist: “The Law of Crappy People”. As soon as someone on a given rung at a company gets as good as the worst person the next rung up, he or she may expect a promotion. Yet, if it’s granted, the firm’s talent levels will gradually slide downhill. No one person need be peculiarly crappy for this to occur; bureaucracies just tend to be crappier than the sum of their parts.