Men’s earnings more heritable than women’s

Using 20 years of Finnish twin earnings records, the study finds that genetic factors explain about 40% of variation in women's lifetime labour earnings and a bit more than 50% for men. Shared family environment plays almost no role, and the result holds after controlling for education and measurement issues. — If male earnings are more strongly linked to genetics than female earnings, policies aimed at reducing inequality (through education or family support) may have different expected returns by sex, and public debates about mobility and fairness need to account for sex‑differentiated biological contributions.