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Homicide is an extreme manifestation of interpersonal conflict with minimal reporting bias and can thus be used as a conflict "assay." Evolutionary models of social motives predict that genetic relationship will be associated with mitigation of conflict, and various analyses of homicide data support this prediction. Most "family" homicides are spousal(More)
Organisms 'discount the future' when they value imminent goods over future goods. Optimal discounting varies: selection should favour allocations of effort that effectively discount the future relatively steeply in response to cues promising relatively good returns on present efforts. However, research on human discounting has hitherto focused on stable(More)
In comparisons among Chicago neighbourhoods, homicide rates in 1988-93 varied more than 100-fold, while male life expectancy at birth ranged from 54 to 77 years, even with effects of homicide mortality removed. This "cause deleted" life expectancy was highly correlated with homicide rates; a measure of economic inequality added significant additional(More)
Men take a proprietary view of women’s sexuality and reproductive capacity. In this chapter, we (a) argue that sexually proprietary male psychologies are evolved solutions to the adaptive problems of male reproductive competition and potential misdirection of paternal investments in species with mistakable paternity; (b) describe the complex interrelated(More)
Frequencies of homicide victimization of wives and husbands, while cohabiting and when separated, are reported for all spousal homicides known to the police in Canada (1974-1990), in New South Wales, Australia (1968-1986), and in Chicago (1965-1990). In all three data sets, the degree to which spousal homicide victimization was female-biased was(More)
Violence against wives occurs in all societies, but the rates at which wives are beaten and killed are enormously variable over time and place. The rate of uxoricide (wife killing) in the United States, for example, is currently approximately five to ten times greater than in western Europe. In some societies, wife beating is normative and allegedly almost(More)
The costly signaling theory of religion posits that religious rituals and taboos can promote intragroup cooperation, which is argued to be the primary adaptive benefit of religion. To test this theory, the authors collected historical data on the constraints and ritual requirements that eighty-three 19th-century U.S. communes imposed on their members. All(More)