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Yeah I think that's fair. I spelled out the situations I think it's realistic for in the middle a bit, though probably should have made that more front and center instead of presenting it as a totalizing view of society.

For now assume that this is a niche interest or a small community where the number of people doing it still has incremental returns, things like “Are there kids playing in the local park” or “Does your block have a block party” or “Do my friends of friends host house parties that I’m invited to.” This also models things that require a very large amount of effort to organize that few people are willing to do, so you need a large amount of people choosing to invest in your community to get just a few willing to put in the hours, things like “Does your grade school have an active cub scout troop” or “Are there community choirs nearby.” At minimum, the density of people willing to do the thing determines how far you have to drive to do the thing, and how much of a pain it is to do.

Sure. But then the second graph demonstrates the sensitivity of the model to this assumption. This turns out to be a critical assumption that heavily influences the results, at least the part of the results we care about. Therefore any conclusions/morals/takeaways need to emphasize this caveat.