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Data are presented indicating that Jewish economic activities have often been characterized by a high degree of nepotism and within-group charity which is central to conceptualizing Judaism as an evolutionary strategy.
Group rather than individual interests have been of primary importance throughout Jewish history, so that, e.g., there were sanctions on individual Jews to ensure that the total resource flow into the group was maximized rather than allow individual Jews to maximize their resource acquisition.
Group evolutionary strategies are proposed to be theoretically unconstrained on a variety of dimensions, and the remaining chapters flesh out the specific characteristics of Judaism as a group evolutionary strategy.
Group strategies are viewed as experiments in living which can be developed and maintained by purely cultural processes, although a later chapter discusses how variation in evolved systems may predispose individuals to form cohesive, genetically exclusive groups.
Finally, data are discussed indicating that there were limits on within-group altruism among Jews.
Although altruism toward poor Jews was an important aspect of Judaism, there was also discrimination against poorer Jews, especially in times of economic and demographic crises.
This material is relevant to the hypothesis that Judaism represents a group strategy which is fairly (but not completely) closed to penetration from gentile gene pools.
The data indicate that Jews have remained genetically distinct from the groups they have lived among despite having lived among them for centuries.
Judaism as a group strategy depends on the development of social controls reinforcing group identity and preventing high levels of genetic admixture from surrounding groups.
There is scholarly agreement that this material was written by Israelite priests during the period of the Babylonian exile.