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Previous studies have identified but failed to explain satisfactorily the positive relationship between income inequality and homicide rates. This paper proposes an explanation based on the concept of relative deprivation, but also reviews the criminological literature in a search for other theoretically relevant variables. After assessing problems of sampling and measurement, and using a considerably larger sample than used in previous studies, multiple regression analyses reveal positive net effects of both inequality and population growth (reflecting a higher proportion of young people) on homicide rates. Further analyses show that the effects of inequality on homicide are more pronounced in more democratic nations, a finding supporting the relative deprivation explanation. Income inequality also has stronger effects in more densely populated countries, in wealthier nations, and in countries with larger internal security forces.
Krahn et al. (Thu,) studied this question.