Do firms respond to gender pay gap transparency?

Summary

The research paper, "Do Firms Respond to Gender Pay Gap Transparency?" by Bennedsen, Simintzi, Tsoutsoura, and Wolfenzon (2022), investigates the impact of pay transparency regulations on the gender pay gap and various firm outcomes. The study leverages a 2006 legislative change in Denmark, which mandated firms with more than 35 employees to disclose gender-disaggregated wage statistics to employee representatives. This natural experiment allowed the authors to examine how firms adapted their compensation policies and other behaviors in response to increased wage transparency. The analysis uses detailed employee-employer administrative data from Denmark, covering the period between 2003 and 2008. To establish causality, the authors employed robust methodologies, including difference-in-differences (DiD) and difference-in-discontinuities (DiD-in-Disc) designs, comparing firms just above the 35-employee threshold (treated group) with those just below (control group). The study's findings reveal a significant reduction in the gender pay gap following the implementation of the transparency law. Specifically, the gender pay gap in treated firms declined by approximately 1.9 to 2 percentage points, which translates to a 13% reduction relative to the pre-legislation mean. This reduction was largely driven by a slowdown in wage growth for male employees (around 1.67 percentage points slower in treated firms compared to control firms), rather than a statistically significant increase in female wages. Beyond wages, the transparency mandate influenced firm human resource practices; treated firms were observed to hire more female employees and promote more women into senior positions. Interestingly, despite the reduction in the overall wage bill, the regulation did not significantly impact firm profitability. This seemingly neutral effect on profits is attributed to an offsetting decline in firm productivity, which was estimated to be around 2.5% in treated firms. The authors also noted that the narrowing of the pay gap was more pronounced at the lower and middle segments of the wage distribution. These results suggest that pay transparency policies can be an effective tool for reducing gender wage disparities, although their broader economic implications, such as potential impacts on productivity, warrant careful consideration by policymakers.