Business improvement districts (BIDs) are a tool used by concerned members of the business community and politicians to enhance a commercial retail area's economic fortunes. As it turns out, they may also improve the social environment of their neighborhoods as well. Published in 2009, this study commissioned by the Centers for Disease Control and Prevention was completed by the RAND Corporation. Throughout its 139-pages the study takes a critical look at how these BIDs have the potential "to reduce a youth's risk to neighborhood violence" and generally improve the social environment. The study was based on research performed in Los Angeles and the report itself is divided into six chapters. The study notes that the activities of BIDs can help increase informal social control, reducing visible signs of disorder and blight, and provide enriched employment opportunities.