Postwar US labour market data reveal a significant secular decline in the employment and wage gaps between men and women. This column quantifies the implications of this shift for the US macroeconomy. Using a time series model that maps empirical trends in data onto underlying structural forces, the authors find that gender-specific labour market trends are responsible for a sizable share of the overall trend increase in GDP and labour productivity in the 1970s, 1980s, and 1990s, as well as the