First of all, it seems to make sense that crime also benefits from the same economies of scale. This could offset the improvement in policing. Secondly, polici

First of all, it seems to make sense that crime also benefits from the same economies of scale. This could offset the improvement in policing. Secondly, policing becomes harder in a city due to increased anonymity and the ease of hiding in plain sight. As a city grows, more and more people don't know each other. This reduces the effectiveness of social policing.