Greg Clark may well be the most important social scientist of the 21st century. His use of historical data informed by evolutionary theory and genetics is a unique contribution to social science with important and challenging results.
Clark’s latest paper (with Neil Cummins) makes a simple but striking point. If the primary systematic determinant of social outcomes is genetic then we expect the father and the mother to contribute equally (each giving half their genes). If, on the other hand, the primary determinant is social then we expect widely different mother-father contributions in different societies and at different times and for different characteristics. Fathers ought to matter more in patriarchies, for example, and mothers more in matriarchies and gender-egalitarian societies. Similarly, if social factors are determinative, we would surely see a rising contribution of mothers to child outcomes as the social power of women rises (you can’t use your mother’s contacts in the legal profession to get a job, for example, if your mother was never a lawyer.) Similarly, if social factors are determinative we would expect mothers to be more important perhaps for characteristics determined early and fathers for characteristics determined late.
As Clark and Cummins write: