we want groups to serve as incubators for contagious messages, then, as they did in the case of Divine Secrets of the Ya-Ya Sisterhood or the early Methodist church, we have to keep groups below the 150 Tipping Point. Above that point, there begin to be structural impediments to the ability of the group to agree and act with one voice. If we want to, say, develop schools in disadvantaged communities that can successfully counteract the poisonous atmosphere of their surrounding neighborhoods, this tells us that we’re probably better off building lots of little schools than one or two big ones.
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