“Even before zoning, differing locational needs help to nudge the most incompatible uses apart: • Industries need to be where land is cheap and transportation is accessible, and complaining neighbors are few and far between. • Large office and commercial centers thrive on the visibility and access afforded by major corridors and transit interchanges. • Residential developments are content to fill up the quiet side streets in between, along with inoffensive retail—think corner stores and cafes. Homeowners don’t want factories or malls showing up on their cul-de-sacs—and they can rest assured that those factories and malls don’t want to open up on their cul-de-sac either. As the legal scholar Bernard Siegan observed in his landmark study of Houston, the city achieves much of what we might consider to be desirable use segregation”