In 109 of the societies, more food is obtained from agriculture than from any of five other food sources. Agriculture is the most frequent food source in a world sample of 186 diverse societies selected by Murdock and White (1969). Other potential customs are absent because they are less compatible. In each human society, natural selection has caused a group of customs to evolve together because they are compatible with each other.

Direct evolutionary linkage of food from agriculture with the associated customs might be attributable to the greater power and wealth obtained by owners of agricultural land. Other predominant customs of this pair member were choice of wife by adult relatives instead of by the adolescent boy, less premarital sexual freedom of adolescents, and less frequent corporal punishment of young children. The pair member that obtained more food from agriculture usually had land transport assisted by animals or vehicles and obtained less food from domesticated animals. Evolutionary linkage of agriculture with another custom can be inferred more accurately from differences between paired nearby societies if the pair member that obtains more food from agriculture has either a higher or a lower score on the other custom in most of the pairs.Р”Р„ world sample of 186 societies contains 93 pairs of nearby societies. In a world sample of diverse societies, geographical and other variations can cause misleading low or high correlations between two customs when measured by scores of individual societies.

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