In this paper, we investigate the effects of the introduction of a nationwide minimum wage in Germany on main jobs, secondary jobs and their interaction by exploiting large-scale administrative data and variation in exposure to the minimum wage across jobs. While we find that the national...

Administrative labour market data for Germany do not contain detailed information on working hours. This poses a serious challenge for many empirical research questions. Between 2010 and 2014, however, it is possible to merge a supplementary data source containing information on working hours...

Researchers regularly use administrative micro-data samples to approximate subgroup aggregates from the full population. In this paper, I argue that the most commonly used method to do this is often not optimal. I outline some alternatives and compare their relative performance in selected...

We present evidence on the extent of measurement error in German longitudinal earnings data. Qualitatively, we confirm the main result of the international literature: longitudinal earnings data are relatively reliable in a cross section but much less so in first differences. Quantitatively, in...

Viel wird über die "Hartz-Reformen" und ihre Effekte spekuliert, aber es gibt bislang so gut wie keine aussagekräftigen Belege, auf die sich derartige Schlussfolgerungen stützen können. Auch wenn sich viele Wirkungen erst im Zeitablauf richtig entfalten werden, besteht doch die Möglichkeit...