HBR: “…women tend to rate their abilities accurately, while men tend to be overconfident about theirs. Thus, one argument goes, women are less confident than men, which hurts their chances of promotion.”

https://hbr.org/2016/07/to-seem-confident-women-have-to-be-seen-as-warm?referral=00202&cm_mmc=email-_-newsletter-_-weekly_hotlist-_-hotlist_date&utm_source=newsletter_weekly_hotlist&utm_medium=email&utm_campaign=hotlist_date