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I think it's likely that the schools won't close until the hospital infrastructure is already visibly overwhelmed (or close) and excess deaths are unavoidable. By that point, everyone who can WFH will, and very few people will be willing to work if it may bring the virus home.
I don't know if it would've been plausible for a US city like SF to replicate something like Singapore's containment strategy. I do think that in the end we'll wish we'd tried, because early, comprehensive, goal-directed action would likely manage both the human & economic costs
