David Koll

Postdoctoral Scholar, University of Mannheim

Research Associate, EUI


I am a Postdoctoral Scholar at the University of Mannheim and a member of the Collaborative Research Center CRC TR 224 “Economic Perspectives on Societal Challenges” in project A03 with Michèle Tertilt.

I also work as a Research Associate at the European University Institute (EUI) with Philipp Kircher on his ERC-Project “Technological Change: New Sources, Consequences, and Impact Mitigation”.

I obtained a PhD in Economics at the EUI in September 2020. My supervisors were Árpád Ábrahám and Dominik Sachs.

My research fields are macroeconomics, labor and public economics.

Here is my CV.


  • Email:
    • koll at uni-mannheim.de
    • david.koll at eui.eu
  • Address:
    • Department of Economics, University of Mannheim
    • Room P.01
    • L7 3-5, 68131 Mannheim
  • Phone: +49 621 181-1959

Summer school and Conference in Dynamic Structural Econometrics 2021

Call for Papers for the Summer school & Conference in Dynamic Structural Econometrics 2021 organised by CRC/TR 224 & the Econometric Society, taking place in Bonn, Germany (Summer school: August 16-22, 2021 and Conference August 19-20, 2021). The topic is Household decision making and human capital in life-cycle models.

Teaching: Spring term 2021 - University of Mannheim

The syllabus for the Master Seminar “Topics in Family Economics” can be found here.


The Fiscal Return to Childcare Policies

This paper studies the dynamic fiscal implications of childcare policies through their impact on maternal life-cycle earnings and tax payments. We estimate a dynamic discrete choice model of female labour supply and childcare decision on German panel data. We account for a large amount of heterogeneity: beyond heterogeneous preferences, education levels, wages, and availability of informal child care, we also account for heterogeneity in fertility such as timing of birth(s) and number of children. This allows us to analyse various (counter-factual) policy experiments and account for the heterogeneous responses to such policies. First, we evaluate a nationwide public childcare expansion in Germany and find that the increase in publicly provided childcare supply fully paid for itself through the dynamic effects on maternal earnings and tax payments. Increasing subsidies further from the current generous levels (approx. 80%), however, would only be 6% self-financing because it would primarily benefit households that are infra-marginal in their childcare and labour supply decision.

From Mancession to Shecession: Women's Employment in Regular and Pandemic Recessions

We examine the impact of the global recession triggered by the Covid-19 pandemic on women’s versus men’s employment. Whereas recent recessions in advanced economies usually had a disproportionate impact on men’s employment, giving rise to the moniker “mancessions,” we show that the pandemic recession of 2020 was a “shecession” in most countries with larger employment declines among women. We examine the causes behind this pattern using micro data from several national labor force surveys, and show that both the composition of women’s employment across industries and occupations as well as increased childcare needs during closures of schools and daycare centers made important contributions. While many countries exhibit similar patterns, we also emphasize how policy choices such as furloughing policies and the extent of school closures shape the pandemic’s impact on the labor market. Another notable finding is the central role of telecommuting: gender gaps in the employment impact of the pandemic arise almost entirely among workers who are unable to work from home. Nevertheless, among telecommuters a different kind of gender gap arises: women working from home during the pandemic spent more work time also doing childcare and experienced greater productivity reductions than men. We discuss what our findings imply for gender equality in a post-pandemic labor market that will likely continue to be characterized by pervasive telecommuting.

Less money for divorced mothers? The child-age dependent reform of alimony in Germany

Using a large administrative panel dataset from Germany, we study the effect of a divorce law reform on the probability to pay alimony as a divorced father. The reform affected divorced couples differently depending on the age of their youngest common child. Using a difference-in-differences setup, we show that the reform decreased the probability to pay alimony if the youngest common child was between four and eight years old compared to the child being between sixteen and seventeen. Therefore, the reform decreased the disposable income of divorced, single mothers with younger children to a greater extent. Our results are robust to different empirical model and control group specifications. They also persist when we restrict the sample to those couples who got divorced before the reform. Furthermore, we show that the treatment intensity of the reform varies with the age of the youngest child having the largest impact if the child is between four and five.

The Intergenerational Correlation of Employment: Mothers as Role Models

We document a substantial positive correlation of employment status between mothers and their children in the United States, linking data from the National Longitudinal Survey of Youth 1979 (NLSY79) and the NLSY79 Children and Young Adults. After controlling for ability, education, fertility, and wealth, a one-year increase in a mother’s employment is associated with, on average, six weeks more employment of her child. The intergenerational transmission of maternal employment is stronger to daughters than to sons, and it is higher for low-educated and low-income mothers. Investigating potential mechanisms, we provide evidence for a role-model channel, through which labor force participation is transmitted. Children, especially daughters, emulate the example of their mother when they observe her working. By contrast, we are able to rule out several alternative candidate explanations such as network effects, occupation-specific human capital and conditions within the local labor market.