Our Beijing-based laboratory experiment investigated gender differences in competitive choices across different birth-cohorts experiencing - during their crucial developmental-age - different institutions and social norms. To control for general time trends, we use Taipei counterpart subjects with identical original Confucian traditions. Our findings confirm that exposure to different institu-tions/norms during crucial developmental-ages significantly changes individuals' behaviour. In particular, Beijing females growing up during the communist regime are more competitively inclined than their male counterparts; their female counterparts growing up during the market regime; and Taipei females. For Taipei, there are no statistically significant cohort or gender differences in willingness to compete.