We offer a theory of gender differences in parental altruism based on the asymmetry that female fertility is constrained but male fertility is relatively unconstrained. Modelling human preferences as having been shaped during the Pleistocene, we derive evolutionarily stable, co-evolved male and...

We propose a theory of the origins of India's caste system by explicitly recognizing the productivity of women in complementing their husbands' occupation-specific skill. The theory explains the core features of the caste system: its hereditary and hierarchical nature, and its insistence on...