If you want to be efficient, you want a level of centralisation so you're make sure they can work with maximum efficiency (and therefore at maximum capacity, wh

If you want to be efficient, you want a level of centralisation so you're make sure they can work with maximum efficiency (and therefore at maximum capacity, which you can scale up as there is more demand or more doses). The biggest problem though is the temperature at which the doses must be stored. Pfeizer's is like -70C°. That's cold, and one does not simply carry a portable freezer to the super-market or subway station. Other vaccines are easier to manage, though.