Children's Economic Roles in the Maya Family Life Cycle: Cain, Caldwell, and Chayanov Revisited

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Who keeps children alive? A review of the effects of kin on child survival (2008, background): “The extended juvenile period of human young is another unusual characteristic of our species, and the economic contributions of older children may also help to underwrite the costs of large family size (Kramer, 2005; Lee & Kramer, 2002#2374).”
Cooperative breeding and its significance to the demographic success of humans. (2010, background): “Where bidirectional transfers between mothers and young have been quantified, children’s subsistence efforts allow their mothers to support more children than they otherwise could without help (Kramer 2005b, Lee & Kramer 2002).”
Women's Sexual Strategies: The Evolution of Long-Term Bonds and Extrapair Sex (2006, background): “Among modern huntergatherers, for example, children do not begin to produce as many calories as they consume unt i l approximate ly 15 years of age (Hill & Hurtado, 1996; Lee & Kramer, 2002), remaining dependent during that time on the provisioning of others.”