How many years after the Norway legislation did it take to measure the outcome? Can you cite any definitive studies on that? (other than https://www.economist.com/business/2018/02/17/ten-years-on-f... "Ten years on from Norway’s quota for women on corporate boards: Gender quotas at board level in Europe have done little to boost corporate performance or to help women lower down")
As to the California state law 2018/SB826 ('Women on Boards'), IIRC part of the reason the state acted was out of frustration that federal legislation on this topic had not happened despite years of discussion.