Publications

We analyze educational institutions’ incentives to set up demanding or lax curricula in duopolistic markets for education with endogenous enrolment of students. We assume that there is a positive externality of student achievement on the local economy. Comparing the case of regulated tuition fees with an unregulated market, we identify the following inefficiencies: Under regulated tuition fees schools will set up inefficiently lax curricula in an attempt to please low-quality students even if schools internalize some of the externality. On the other hand, unregulated schools set up excessively differentiated curricula in order to relax competition in tuition fees. Deregulation gets more attractive if a larger fraction of the externality is internalized.

When the Soviet Union collapsed a transition process started in Eastern Europe. This included a number of reforms to adapt the educational system to the new requirements of the job market. To assess the educational systems in Eastern Europe, this paper takes a look at the gap in PISA test scores between different countries. Using PISA 2006 data we disentangle the effects that explain the gap between Finland, the best performing country, and seven Eastern European countries, as well as, between Eastern European countries. The methodology applied in this paper is a semiparametric version of the threefold Blinder-Oaxaca decomposition, an approach which is not yet used in the research regarding the differences in school outcomes. Our results show that in all cases the differences in characteristics does not explain much of the gap. The return effect is the driving force of the differences in test scores. Under our identifying assumption, our results therefore indicate that the PISA test score gap can mainly be attributed to the different efficiency of school systems and are not due to better characteristics of students in a particular country. Furthermore, we provide evidence that the gap is smaller for better students indicating that, especially for poor performing students, the efficiency of Eastern European schools is behind the efficiency of Finnish schools.

This paper empirically investigates the tranching and tranche pricing of European securitization transactions of corporate loans and bonds. Tranching allows the originator to issue bonds with strong quality differences and thereby attract heterogeneous investors. We find that the number of differently rated tranches in a transaction is inversely related to the quality of the underlying asset pool. Credit spreads on tranches in a transaction are inversely related to the number of tranches. The average price for transferring a unit of expected default risk, paid in a transaction, is inversely related to the default probability of the underlying asset pool. The average price, paid for a tranche, increases with the rating of the tranche, it is higher for the lowest rated tranche and very high for AAA-tranches in true sale-transactions. It varies little across butterfly spreads obtained from rated tranches except for the most senior spread.

This paper studies ethnic discrimination in Germany s labour market with a correspondence test. To each of 528 advertisements for student internships we send two similar applications, one with a Turkish-sounding and one with a German-sounding name. A German name raises the average probability of a callback by about 14 percent. Differential treatment is particularly strong and significant at smaller firms at which the applicant with the German name receives 24 percent more callbacks. Discrimination disappears when we restrict our sample to applications including reference letters which contain favourable information about the candidate s personality. We interpret this finding as evidence for statistical discrimination.

We analyze whether a redistributive government should provide ex ante insurance against unfortunate outcomes or whether it should instead rely on transfers for redistributing income ex post. To this end, we develop a model of education in which individuals face educational risk and wage dispersion across two types of skills. Successful graduation and working as a skilled worker depends on individual effort in education and on public resources, but educational risk still causes (income) inequality. We show that in a second-best setting, in which learning effort is not observable, improving the quality of education by public funding of the educational sector has a significant effect and that this increases efficiency in comparison to a pure (linear) income tax with income transfers from skilled to unskilled workers. Compared to a first-best solution, providing ex ante insurance significantly gains importance relative to traditional ex post redistribution, because it simultaneously alleviates moral hazard in education. These results are strengthened when a (distortionary) skill-specific tax can be implemented.

While macroeconomic volatility in the US economy decreased since the early 1980's, individual earnings volatility and wage inequality increased. This paper argues that increasing financial development can contribute to both changes. I develop a real business cycle model with sectoral productivity shocks and labor as well as credit market frictions. Credit market frictions take the form of collateral-based credit constraints. It is shown that there are interactions between the labor and the credit market that matter for the development of wages and output. When workers are not perfectly mobile between sectors, financial development comes along with an increase in the volatility of individual earnings and in wage inequality, although aggregate output volatility is lower.

We examine the effects of background risks on optimal portfolio choice. Examples of background risks include uncertain labor income, uncertainty about the terminal value of fixed assets such as housing and uncertainty about future tax liabilities. While some of these risks are additive and have been amply studied, others are multiplicative in nature and have received far less attention. The simultaneous effect of both additive and multiplicative risks has hitherto not received attention and can explain some paradoxical choice behavior. We rationalize such behavior and show how background risks might lead to seemingly U-shaped relative risk aversion for a representative investor.

Machiavelli advises against delegating the distribution of favors. We test this claim in an experiment, in which an investor can directly transfer money to a trustee or delegate this decision to another investor. Varying the value of the transfers of the investor and the delegate, we find that the trustee s rewards follow a rather simple pattern. In all situations, both investors are rewarded, but the person who actually decides gets a higher reward. Delegation only pays off for the initial decision maker if the value of the delegate s transfer is much higher than the value of the investor s transfer.

To gain insights about the quality of boards' firing decisions, we investigate abnormal stock returns and operating performance around CEO-turnover announcements in a new hand-collected sample of 208 "clean'' turnover events between January 1998 and June 2009. Unlike the majority of previous studies, we show that forced turnovers do not per se represent a positive signal to shareholders. On the contrary, investors seem to critically assess the board's firing decision by considering the quality of the departing manager. When an outperforming CEO is dismissed or forced to leave - an event that occurs in as many as 35% of all dismissals in our sample - shareholders disesteem the board's decision. This finding is confirmed in multivariate cross-sectional regressions, holds for different time subperiods, and is robust to various event-test specifications and proxies of CEO quality.

In its recently published Green Paper, the European Commission 2010 discusses various methods to enhance the reliability of audits and to re-establish trust in the financial market. The Commission primarily focuses on increasing auditor independence and on reducing the high level of audit market concentration. Based on a model in the tradition of the circular market matching models introduced by Salop 1979, we show that prohibiting non-audit services as a measure intended to improve auditor independence can have counter-productive secondary effects on audit market concentration. In fact, our model demonstrates that incentives for independence and the structure of the audit market are simultaneously determined. Because market shares are endogenous in our model, it is not even clear that prohibiting non-audit services indeed increases an auditor’s incentive to remain independent.

We consider a model of on-the-job search where firms offer long-term wage contracts to workers of different ability. Firms do not observe worker ability upon hiring but learn it gradually over time. With sufficiently strong information frictions, low-wage firms offer separating contracts and hire all types of workers in equilibrium, whereas high-wage firms offer pooling contracts designed to retain high-ability workers only. Low-ability workers have higher turnover rates, they are more often employed in low-wage firms and face an earnings distribution with a higher frictional component. Furthermore, positive sorting obtains in equilibrium.

We study the interaction of different motives and decision processes in determining behavior in the ultimatum game. We rely on an experimental manipulation called ego depletion which consumes self-control resources, thereby enhancing the influence of default reactions or, in psychological terms, automatic processes. We find that proposers make lower offers under ego depletion, i.e. self-centered monetary concerns are the default mode and not other-regarding considerations (fairness towards others). Responders are more likely to reject low offers under ego depletion, i.e. the affect-influenced reaction to reject unfair offers (reaction to unfairness towards oneself) is more automatic than unconditional monetary concerns.

We investigate the role of affect and deliberation on social preferences. In our
laboratory experiment subjects decide on a series of mini Dictator games while they are under varying degrees of cognitive load. The cognitive load is intended to decrease deliberation and therefore enhance the influence of affect on behavior. In each game subjects have two options: they can decide between a fair or an unfair allocation. We find that subjects in a high-load condition are more generous - they more often choose the fair allocation than subjects in a
low-load condition. The series of mini Dictator games also allows us to investigate how subjects react to the games’ varying levels of advantageous inequality. Low-load subjects react considerably more to the degree of advantageous inequality. Our results therefore underscore the importance of affect for basic altruistic behavior and deliberation in adjusting decisions to a given situation.