The omitance of Third Places from our communities makes it harder for cross-socioeconomic mingling to happen also. Places like cafes, pubs, community clubs and public outdoor spaces. This is especially troublesome in suburbia, and not nearly as troublesome in somewhere like NYC, Paris, or Tokyo.

I think we simply forgot to accomodate for it in zoning and city planning. Where you have mixed commercial and residential zoning with public spaces it happens naturally in my experience.