Maple Row is markedly safer, and the striking part is why. The two streets earn the same. What differs is collective efficacy: neighbours who trust one another and are willing to act for the common good. It predicts lower violence even after accounting for how poor an area is (Sampson, Raudenbush and Earls, 1997). The social fabric, not just the money, is doing the work.

Two honest notes. This is partly something residents build together, so it is a lever, not a fixed trait of a place. And researchers work hard to separate it from who chose to live where, the selection problem that clouds all neighbourhood studies.