[legerdemain]

Notably, many college campuses seem to offer most of these services already: food courts restaurants, and cantinas, small retail for student and faculty needs, utility buildings, housing (undergraduate and graduate, including for students with families), childcare centers for the children of students and faculty, office space (duh), gyms and pools (which HN is fond of ranting at), access to medical services, green spaces, campus fire and police, and park-like green space around campus, and competing services in many of these categories located just off campus.

[falcolas]

Speaking for myself, I've never seen a campus with all of: A full grocery store. Elementary, middle, or high schools (with associated sports facilities). Jails. Courthouses. Hospitals (not basic medical services, fully featured hospitals with Ambulance support). Police forces (not half a dozen campus cops, or loaned police officers)... and so forth.

And remember, we're discussing building cities like campuses - there is no "just off campus" space available for competition.

We're discussing campuses the size of Manhattan Island, without most of the roads (which will hugely impact the ability to deliver goods and take away waste; just see how New York is taken over by these two activities at night). Also, without suburbs, so the housing (and all of the support necessary for that population) needs to be that much more dense (and affordable).