Ah, I see. What I'm missing: if business scales down, thus population and culture scale down (unless populated by people independent of these things). This mea

Ah, I see. What I'm missing: if business scales down, thus population and culture scale down (unless populated by people independent of these things). This means higher vacancies of existing residential, so how much new residential is needed? I guess what I'm ultimately wondering: what's the "critical mass" of a city? At what point, does the commerce/social engine get small enough that it's no longer sustainable? We already saw many US cities were "weekday-only" cities, devoid of anything interesting, before the pandemic.