Research conducted at Sydney University by Professor Marian Baird has revealed a positive correlation between employer secrecy and the gender pay gap. Professor Baird's research also found that women’s average full-time total remuneration across all industries and occupations is 20.8% less than men’s. This statistic means that men on average make more than $25,679 a year more than women. Employer secrecy on wages allows companies to ignore the reality of the stark gender pay gap in the US economy.
See "Employer secrecy around staff pay is fuelling gender pay gap, says expert", Melissa Davey, The Guardian, November 11, 2019