This article investigates women's and men's labor supply to the firm within a semistructural approach based on a dynamic model of new monopsony. Using methods of survival analysis and a large linked employer-employee data set for Germany, we find that labor supply elasticities are small (1.9-3.7) and that women's labor supply to the firm is less elastic than men's (which is the reverse of gender differences in labor supply usually found at the level of the market). Our