Measuring the effect of ballot access restrictions on electoral competition is complicated because the stringency of ballot access regulations cannot be treated as being exogenous to candidates' entry decisions. This paper exploits the 1968 U.S. Supreme Court decision to strike down Ohio's...

Measuring the effect of ballot access restrictions on electoral competition is complicated because the stringency of ballot access regulations cannot be treated as being exogenous to candidates' entry decisions. This paper exploits the 1968 U.S. Supreme Court decision to strike down Ohio's...

Demand for personalized online tutoring in higher education is growing but there is little research on its effectiveness. We conducted an RCT offering remote peer tutoring in micro- and macroeconomics at a German university teaching online due to the Covid-pandemic. Treated students met in small...

I investigate causal machine learning (CML) methods to estimate effect heterogeneity by means of conditional average treatment effects (CATEs). In particular, I study whether the estimated effect heterogeneity can provide evidence for the theoretical labour supply predictions of Connecticut's...

Recent studies have proposed causal machine learning (CML) methods to estimate conditional average treatment effects (CATEs). In this study, I investigate whether CML methods add value compared to conventional CATE estimators by re-evaluating Connecticut's Jobs First welfare experiment. This...

To fight the spread of COVID-19, many countries implemented unprecedented social distancing policies. This is the first paper that uses an event-study approach to examine the effects of the German social distancing policies on (a) individual behavior and (b) the spread of the epidemic. Combining...

To fight the spread of COVID-19, many countries implemented unprecedented social distancing policies. This is the first paper that uses an event-study approach to examine the effects of the German social distancing policies on (a) individual behavior and (b) the spread of the epidemic. Combining...