The key to investing is not assessing how much an industry is going to affect society, or how much it will grow, but rather determining the competitive advantage of any given company and, above all, the durability of that advantage.
[Economy] is flat on the floor, and the paramedics have arrived. And they shouldn't argue about whether they put the resuscitation equipment a quarter of an inch this way or a quarter of an inch this way, or they shouldn't start criticizing the patient, because he didn't have a blood pressure test or something like that. They should do what's needed right now.