We examine optimal taxation and social insurance if insurance markets are imperfect. This requires the development of a theory of labor supply under uncertainty. We show that the case for social insurance is not generally reinforced by adverse selection in insurance markets as social insurance...

I test if parties matter with respect to the allocation of public expenditures in Germany. Considering the allocation of rights and duties due to the federal structure, two econometric models are estimated. First, a SURE model analyses spending at the federal level for the period from 1950 to...

This paper examines the effects of political determinants on the allocation of public expenditures. Analyzing an OECD panel from 1990 to 2004, a SURE model controls for the contemporaneous correlation between the different expenditure categories (COFOG). I find that left governments set other...

This paper examines how policy affects social expenditures. Analyzing an OECD panel from 1980 to 2003, five political variables are tested: Election- and pre-election years, the ideological party composition of the governments, the number of coalition partners and the fact, if the ruling...

The gender wage gap is a persistent labor market phenomenon. Most research focuses on the determinants of these wage differences. We contribute to this literature by exploring a different research question: if wages of women are systematically lower than male wages, what are the distributional...

We assess the relevance of formal education for the productivity of the self-employed and distinguish between opportunity entrepreneurs, who voluntarily pursue a business opportunity, and necessity entrepreneurs, who lack alternative employment options. We expect differences in the returns to...

This paper studies the causal effects of graduating from university with an honors degree on subsequent earnings. While a rich body of literature has focused on estimating returns to human capital, few studies have analyzed returns at the very top of the education distribution. We highlight the...

In this paper employment effects of a sectoral minimum wage in the German construction sector are estimated from a single cross-sectional wage distribution using parametric and semi-parametric models. Parametric functional form assumptions seem too restrictive and lead to implausible results. We...

In this paper I investigate the causal returns to education for different educational groups in Germany by employing a new method by Klein and Vella (2010) that bases identification on the presence of conditional heteroskedasticity. Compared to IV methods, key advantages of this approach are...