Everybody faces from time to time demands to make whatever they're doing more efficient. I am no supporter of wasted time and effort. But I always caution the people demanding greater efficiency. Imagine, I say to them, that you are at the top of a 20-story building. Standing by the window. You know the most efficient way to get back down to the bottom. Right? And sometimes, I conclude, some inefficiencies - some resistance and some friction - are exactly what are needed. The principle of efficiency, ruthlessly applied, inevitably leads to a fall.