“What counts as social infrastructure? I define it capaciously. Public institutions such as libraries, schools, playgrounds, parks, athletic fields, and swimming pools are vital parts of the social infrastructure. So too are sidewalks, courtyards, community gardens, and other green spaces that invite people into the public realm. Community organizations, including churches and civic associations, act as social infrastructures when they have an established physical space where people can assemble, as do regularly scheduled markets for food, furniture, clothing, art, and other consumer goods. Commercial establishments can also be important parts of the social infrastructure, particularly when they operate as what the sociologist Ray Oldenburg called "third spaces," places (like cafes, diners, barbershops, and bookstores) where people are welcome to congregate and linger regardless of what they've purchased.”