TY - JOUR AU - Cook,Phillip J. AU - Ludwig,Jens TI - The Social Costs of Gun Ownership JF - National Bureau of Economic Research Working Paper Series VL - No. 10736 PY - 2004 Y2 - September 2004 UR - http://www.nber.org/papers/w10736 L1 - http://www.nber.org/papers/w10736.pdf N1 - Author contact info: Jens Ludwig University of Chicago 1155 East 60th Street Chicago, IL 60637 Tel: 773/834-0811 Fax: 773/834-1582 E-Mail: jludwig@uchicago.edu AB - This paper provides new estimates of the effect of household gun prevalence on homicide rates, and infers the marginal external cost of handgun ownership. The estimates utilize a superior proxy for gun prevalence, the percentage of suicides committed with a gun, which we validate. Using county- and state-level panels for 20 years, we estimate the elasticity of homicide with respect to gun prevalence as between +.1 and +.3. All of the effect of gun prevalence is on gun homicide rates. Under certain reasonable assumptions, the average annual marginal social cost of household gun ownership is in the range $100 to $600. ER -