“…More recently, several studies have highlighted the importance of complementarity in the effectiveness of public good provision, specifically when crime is involved. Albouy, Christensen, and Sarmiento-Barbieri (2018) show that public safety, a private good purchased through residential choice decisions, is a complement to environmental amenities like public parks: safe parks are a public good, while unsafe parks are a public bad as confirmed by their data from the U.S. cities. Blattman, Green, Ortega, and Tobon (2017) presents evidence from randomly assigned police officers and investments in municipal services that targeted public "hot spot" policing itself is not an effective crime reduction policy, but that when paired with complementary local improvements in lighting and cleanliness of streets crime is significantly reduced.…”