We show that the OLS and fixed‐effects (FE) estimators of the popular difference-in-differences model may deviate when there is time varying panel non-response. If such non-response does not affect the common-trend assumption, then OLS and FE are consistent, but OLS is more precise. However,...

Using rich panel data recently available from Spanish Social Security records, we find that a negative motherhood earnings differential of 2.3 log points remains even after controlling for both individual- and firm-level unobserved heterogeneity. The analysis of the mothers and childless women's...

Using data from Spanish Social Security records, we investigate the returns to experience in different flexible work arrangements, including part-time and full-time work, and permanent and fixed-term contracts. We use a trivariate random effects model which consists of a three-equation system...

Family-friendly laws may backfire if not all workers with access to the policies use them. Because these policies are costly to the employer, hiring practices may consequently be affected at the detriment of the at-risk population who may end up accessing the policy. We exploit a 1999 Spanish...

While much of the literature that investigates the part-time (PT) / full-time (FT) hourly wage differential and its causes focuses on average effects, very few studies analyze the heterogeneous effects of PT work across different subgroups, despite the policy relevance of understanding channels...

This paper analyzes the effects of entry labor-market conditions on workers' career in Spain, a country well known for its highly segmented labor market and rigid labor-market institutions. In contrast with more flexible labor markets, we find that the annual earnings losses of individuals...

We show that the OLS and fixed‐effects (FE) estimators of the popular difference-in-differences model may deviate when there is time varying panel non-response. If such non-response does not affect the common-trend assumption, then OLS and FE are consistent, but OLS is more precise. However,...

We use a difference-in-differences model with individual fixed effects to evaluate a 1999 Spanish law granting employment protection to workers with children younger than 6 who had asked for a shorter workweek due to family responsibilities. Our analysis shows that well- intended policies can...

Using a differences-in-differences approach and controlling for individual unobserved heterogeneity, we evaluate the impact of a 1999 law that granted all workers with children younger than 7 years old protection against a layoff if the worker had previously asked for a work-week reduction due...