Research

Selected work in progress:

Simonsen, M., L. Skipper and J. A. Smith: Welfare Reform: Consequences for the Children.  Available via arXiv:2506.03927 [econ.GN]

Simonsen, M., L. Skipper and J. A. Smith: Effects of Welfare Reform: the Role of Barriers to Work.

Michel, B., K. R. Thomsen, M. Hesse and M. Simonsen: Curtailing the Consequences of Parental Substance Use: Supporting Troubled Young Adults. 

Selected published or forthcoming:

Andersen, C. M., T. Hener, C. B. Pedersen, M. Simonsen, L. Skipper et al. (forthcoming): Air pollution and Cognition in Children: Evidence from National Tests in Denmark. Journal of Human Resources. Also available as CESifo Working Paper No.  11434.

Simonsen, M. and L. Skipper (2025): Healthy at Work? Evidence from a Social Experimental Evaluation of a Firm-based Wellness Program (forthcoming): American Economic Journal: Economic Policy 17(3), 471-95. Also available as CESifo Working Paper No. 11209.

Damm, A. P., B. Ø. Larsen, H. S. Nielsen and M. Simonsen (forthcoming): Lowering the Minimum Age of Criminal Responsibility: Consequences for Juvenile Crime: Journal of Quantitative Criminology

Harding, T. P. Rendahl, M. Simonsen and E. Wengström (2025): The Scandinavian Journal of Economics at 125: a note from the editors. The Scandinavian Journal of Economics 126(4), 629-642. https://doi.org/10.1111/sjoe.12583.

Trillingsgaard, T., H. N. Fentz and M. Simonsen (2024): Does Group-Based Parent Support during the Transition to Parenthood affect Child Socio-Emotional Problems and Health Care Utilization? A Randomized Controlled Trial. Social Science and Medicine 347, 116741. 

Breining, S., N. M. Daysal, M. Simonsen and M. Trandafir (2022): Spillover Effects of Early-Life Medical Interventions. Review of Economics and Statistics 104(1), 1-16.

Black, S., S. Breining, D. Figlio, J. Guryan, K. Karbownik, H. S. Nielsen, J. Roth and M. Simonsen (2021): Sibling Spillovers. The Economic Journal 131, 101-128. 

Simonsen, M., L. Skipper, N. Skipper and P.  Thingholm (2021): Discontinuity in Care: Practice Closures among Primary Care Providers and Patient Health. Journal of Health Economics 80, 102551. 

Simonsen, M., L. Skipper and N. Skipper (2021): Spot Price Biases in Non-linear Health Insurance Contracts. Journal of Public Economics 203, 104508.

Trillingsgaard, T., R. Maimburg and M. Simonsen (2021): Group-based parent support during the transition to parenthood. Primary outcomes from a randomised controlled trial. Social Science and Medicine 287, 114340. 

Maibom, J., H. H. Sievertsen, M. Simonsen and M. Wüst (2021): Maternity Ward Crowding, Procedure Use, and Child Health. Journal of Health Economics 75, 102399.

Landersø, R., H. S. Nielsen and M. Simonsen (2020): How Going to School Affects the Family.  Journal of Human Resources 55(4), 1258-1286.

Gørtz, M., E. R. Johansen and M. Simonsen (2018): Academic Achievement and the Gender Composition of Preschool Staff. Labour Economics 55, 241-258 .

Landersø, R., H. S. Nielsen and M. Simonsen (2017): School Starting Age and the Crime-Age Profile. The Economic Journal 127, 1096-1111.

Datta Gupta, N. and M. Simonsen (2016): Academic Performance and Type of Early Childhood Care. Economics of Education Review 53, 217-229.

Simonsen, M., L. Skipper and N. Skipper (2016): Price Sensitivity of Demand for Prescription Drugs: Exploiting a Regression Kink Design. Journal of Applied Econometrics 31, 320-337.

Ciliberto, F., A. Miller, H. S. Nielsen, and M. Simonsen (2016): Playing the Fertility Game at Work: An Equilibrium Model of Peer Effects. International Economic Review 57, 827-856.

Dalsgaard, S., H. S. Nielsen, J. Leckman, P. B. Mortensen, and M. Simonsen (2015): The Effect of Medication On the Risk of Injuries in Children with Attention-Deficit/Hyperactivity Disorder - A Prospective Cohort Study. The Lancet Psychiatry 2, 702-709.

Kristoffersen, J., M. Krægpøth, H. S. Nielsen and M. Simonsen (2015): Disruptive School Peers and Student Outcomes. Economics of Education Review 45, 1-13.

Trillingsgaard, T., R. D. Maimburg, and M. Simonsen (2015): The Family Startup Program: Study Protocol for a Randomized Controlled trial of a Universal Group-based Parenting Support Program. BMC Public Health 15, 409.

Dalsgaard, S., H. S. Nielsen, and M. Simonsen (2014): Consequences of ADHD Medication Use for Children’s Outcomes. Journal of Health Economics 37, 137-151.

Eriksen-Jensen, T. L., H. S. Nielsen, and M. Simonsen (2014): Bullying in Elementary School. Journal of Human Resources 49, 839-871.

Kvist, A. P., H. S. Nielsen and M. Simonsen (2013): The Importance of Children’s ADHD for Parents’ Relationship Dissolution and Labor Supply. Social Science and Medicine 83, 30-38.

Søren Dalsgaard, Helena Skyt Nielsen, Jim Leckman and Marianne Simonsen (2013): Five-fold increase in national prevalence rates of ADHD medications for children and adolescents with Autism Spectrum Disorder, Attention-Deficit/Hyperactivity Disorder and other psychiatric disorders – A Danish register-based study. Journal of Child and Adolescent Psychopharmacology. 23, 432-439. 

Featured in "From the Editor-in-Chief's Desk"

Dalsgaard, S., M. K. Humlum, H. S. Nielsen and M. Simonsen (2012): Relative Standards in ADHD Diagnoses: The Role of Specialist Behavior. Economics Letters 117, 663-665.

Cáceres-Delpiano, J. and M. Simonsen (2012): The Toll of Fertility on Mothers' Well-being. Journal of Health Economics 31, 752-766.

Datta Gupta, N. and M. Simonsen (2012): Effects of Type of Non-parental Child Care on Pre-teen Skills and Risky Behavior. Economics Letters 116, 622-625.

Simonsen, M. and L. Skipper (2012): The Family Gap in Wages: What Wombmates Reveal. Labour Economics 19, 102-112

Simonsen, M. (2010): Price of High Quality Day Care and Female Employment. The Scandinavian Journal of Economics 112, 570-594.

Datta Gupta, N. and M. Simonsen (2010): Non-cognitive Child Outcomes and Universal Child Care. Journal of Public Economics 94, 30-43.

Shaikh, A. M., M. Simonsen, E. J. Vytlacil, and N. Yildiz (2009): A Specification Test for the Propensity Score using its Distribution Conditional on Participation. Journal of Econometrics 151, 33-46.

Simonsen, M. and L. Skipper (2008): An Empirical Assessment of Effects of Parenthood on Wages. in D. Millimet, J. Smith & E. J. Vytlacil, eds, Advances in Econometrics 21, pp. 359-380.

Simonsen, M. and L. Skipper (2006): The Costs of Motherhood: An Analysis Using Matching Estimators. Journal of Applied Econometrics 21(7), pp. 919-934.

Nielsen, H. S., Simonsen, M., and M. Verner (2004): Does the Gap in Family Friendly Policies Drive the Family Gap? The Scandinavian Journal of Economics 106 (4), pp. 721-744.