Gendered Representation and Critical Mass: Women’s Legislative Representation and Social Spending in 22 OECD Countries

To better understand the dynamics of representation of women’s interests such as public expenditure on healthcare, daycare, and education, this study examines statistical evidence for the notion of critical mass. To do so, this study uses the Comparative Welfare States Data Set and the piecewise regression method to produce two linear models that best fit to the data for different ranges of the share of seats in parliament held by women. The analysis fails to find consistent support for a threshold below which women legislators have little-to-no impact upon policy outcomes. By adjudicating seven hypothetical thresholds, the analysis also shows that when there is a critical mass effect, the 10 percent level is more a consequential threshold than 15, 20, or 30 percent levels. Findings suggest that we reject the idea of a critical threshold for women’s legislative representation. However, the relationship between the representation and social spending is robust with or without presumed critical mass.