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My question is what R0 looks like in a city with mass transit vs without. The subway in NYC is huge and puts so many people together in close contact every day.

Is it outrageous to think R0 could be 3.5 in NYC but 1.5 somewhere else?

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I think that, in the terminology of the paper, a higher proportion of New Yorkers would be considered 'high-active' compared to, say, LA, and perhaps there is a level that you don't even see in less crowded-mobile societies. I would guess it is helpful to keep the biological and social factors separate when modeling what is going on.

> Is it outrageous to think R0 could be 3.5 in NYC but 1.5 somewhere else?

No, not at all. It would be outrageous to think that it doesn't vary by a factor of two IMO.

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