Contributions in Merlin

What determines reciprocity in employment relations? We conducted a controlled field experiment to measure the extent to which monetary and non-monetary gifts affect workers’ performance. We find that non-monetary gifts have a much stronger impact than monetary gifts of equivalent value. We also observe that when workers are offered the choice, they prefer receiving money but reciprocate as if they received a non-monetary gift. This result is consistent with the common saying, "it’s the thought that counts". We underline this point by showing that also monetary gifts can effectively trigger reciprocity if the employer invests more time and effort into the gift’s presentation.

Two pension reforms in Austria increased the early retirement age from 60 to 62 for men and from 55 to 58.25 for women. The reforms reduced early retirement by 18.9 percentage points among affected men aged 60-62 and by 22.3 percentage points among affected women aged 55-58.25. The associated increase in employment was merely 6.8 percentage points among men and 10.1 percentage points among women. The reforms had large spillover effects to the unemployment insurance program but negligible effects on disability insurance claims. Specifically, unemployment increased by roughly 10 percentage points both among men and women. Spillover effects had substantial fiscal implications. Absent spillover effects, the reduction of net government expenditures would have amounted to 264 million Euros per year. Due to higher unemployment insurance claims and associated foregone income tax revenues the actual reduction was only 148 million Euros. High-wage and healthy workers carried the bulk of the fall in net government expenditures. Low-wage and less healthy workers generated much less government savings as they either continue to retire early via disability pensions or bridge the gap to regular retirement by drawing unemployment benefits.

This paper calculates the impact of Active Labour Market Programmes through the use of three new indicators measuring the application performance of the unemployed. These indicators can be measured repeatedly and therefore allow the usage of Panel Regression methods, cancelling out any unobserved individual heterogeneity. To implement the new approach, data on 30,000 applications has been collected. Using this data, a large positive effect for unemployed with a long term unemployment forecast was estimated. For unemployed without such a forecast, the effect is much smaller. The paper also shows that the new evaluation approach fulfils the requirements of a good controlling instrument: It is accurate, detailed, non-intrusive, inexpensive and therefore easy to keep up to date, easy to understand and communicate.

Some of the most beautiful results in mechanism design depend crucially on Myerson's (1981) regularity condition. E.g., the second-price auction with reserve price is revenue maximizing only if the type distribution is regular. This paper offers two main results. First, an interpretation of regularity is developed in terms of being the next to fail. Second, using expanded concepts of concavity, a tight sufficient condition on the density function is formulated. New examples of parameterized distributions are shown to be regular. Applications include standard design problems, optimal reserve prices, the analysis of bidding data, and multidimensional types.

Gordon Tullock has been one of the most important founders and contributors to Public Choice. Two innovations are typical “Tullock Challenges”. The first relates to method: the measurement of subjective well-being, or happiness. The second relates to digital social networks such as Facebook, Twitter, or to some extent Google. Both innovations lead to strong incentives by the governments to manipulate the policy consequences. In general “What is important, will be manipulated by the government”. To restrain government manipulation one has to turn to Constitutional Economics and increase the possibilities for direct popular participation and federalism, or introduce random mechanisms.

This paper studies differences in inequality perceptions, distributional norms, and redistributive preferences between East and West Germany. As expected, there are substantial differences with respect to all three of these measures. Surprisingly, however, differences in distributional norms are much smaller than differences with respect to inequality perceptions or redistributive preferences. Nonetheless, individuals from East Germany tend to be more supportive of state redistribution and progressive taxation, and less likely to have a conservative political orientation, even conditional on having the same inequality perceptions and distributional norms.

Classical models of money are typically based on a competitive market without capital or credit. They then impose exogenous timing structures, market participation constraints, or cash-in-advance constraints to make money essential. We present a simple model without credit where money arises from a fixed cost of production. This leads to a rich equilibrium structure. Agents avoid the fixed cost by taking vacations and the trade between workers and vacationers is supported by money. We show that agents acquire and spend money in cycles of finite length. Throughout such a “money cycle,” agents decrease their consumption which we interpret as the hot potato effect of inflation. We give an example where money holdings do not decrease monotonically throughout the money cycle. Optimal monetary policy is given by the Friedman rule, which supports efficient equilibria. Thus, monetary policy provides an alternative to lotteries for smoothing out non-convexities.

We construct and estimate a unified model combining three of the main sources of cross-country income disparities: differences in factor endowments, barriers to technology adoption and the inappropriateness of frontier technologies to local conditions. The key components are different types of workers, distortions to capital accumulation, directed technical change, costly adoption and spillovers from the world technology frontier. Despite its parsimonious parametrization, our empirical model provides a good fit of GDP data for up to 86 countries in 1970 and 122 countries in 2000. Removing barriers to technology adoption would increase the output per worker of the average non-OECD country relative to the US from 0.19 to 0.61, while increasing skill premia in all countries. Removing barriers to trade in goods amplifies income disparities, induces skill-biased technology adoption and increases skill premia in the majority of countries. These results are reverted if trade liberalization is coupled with international IPR protection.

We construct a dynamic theory of civil conflict hinging on inter-ethnic trust and trade. The model economy is inhabitated by two ethnic groups. Inter-ethnic trade requires imperfectly observed bilateral investments and one group has to form beliefs on the average propensity to trade of the other group. Since conflict disrupts trade, the onset of a conflict signals that the aggressor has a low propensity to trade. Agents observe the history of conflicts and update their beliefs over time, transmitting them to the next generation. The theory bears a set of testable predictions. First, war is a stochastic process whose frequency depends on the state of endogenous beliefs. Second, the probability of future conflicts increases after each conflict episode. Third, "accidental" conflicts that do not reflect economic fundamentals can lead to a permanent breakdown of trust, plunging a society into a vicious cycle of recurrent conflicts (a war trap). The incidence of conflict can be reduced by policies abating cultural barriers, fostering inter-ethnic trade and human capital, and shifting beliefs. Coercive peace policies such as peacekeeping forces or externally imposed regime changes have instead no persistent effects.

Many studies have found a gap between willingness-to-pay and willingness-to-accept that is inconsistent with standard theory. There is also evidence that the gap is eroded by experience gained in the laboratory and naturally occurring markets. This paper argues that the gap and the effects of experience are explained by a caution heuristic. This conjecture is tested in a repeated market experiment with symmetric and asymmetric information. The results support the conjecture: people do seem to use heuristics rather than reacting optimally and their behavior adjusts slowly when the environment changes.