This paper considers the relationship between inequality and crime using data from urban counties. The behavior of property and violent crime are quite different. Inequality has no effect on property crime but a strong and robust impact on violent crime, with an elasticity above 0.5. By contrast, poverty and police activity have significant effects on property crime, but little on violent crime. Property crime is well explained by the economic theory of crime, while violent crime is better explained by strain and social disorganization theories.

To test a model of contagion—where individuals hear some bad news and communicate it to their acquaintances, who then pass it on, leading to a market panic—requires a knowledge of the information networks of participants, something hitherto unavailable. For two panics in the 1850's this paper examines the behavior of Irish depositors in a New York bank. As recent immigrants, their social network was determined largely by their place of origin in Ireland, and where they lived in New York. During both panics this social network turns out to be the prime determinant of behavior. (JEL G21, N21)