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 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,...

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 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...

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...