The Diablo 3 Economy: An Agent Based Approach
Makram El-Shagi, Gregor von Schweinitz
Computational Economics,
Nr. 2,
2016
Abstract
Designers of MMOs such as Diablo 3 face economic problems much like policy makers in the real world, e.g. inflation and distributional issues. Solving economic problems through regular updates (patches) became as important to those games as traditional gameplay issues. In this paper we provide an agent framework inspired by the economic features of Diablo 3 and analyze the effect of monetary policy in the game. Our model reproduces a number of features known from the Diablo 3 economy such as a heterogeneous price development, driven almost exclusively by goods of high quality, a highly unequal wealth distribution and strongly decreasing economic mobility. The basic framework presented in this paper is meant as a stepping stone to further research, where our evidence is used to deepen our understanding of the real-world counterparts of such problems. The advantage of our model is that it combines simplicity that is inherent to model economies with a similarly simple observable counterpart (namely the game environment where real agents interact). By matching the dynamics of the game economy we can thus easily verify that our behavioral assumptions are good approximations to reality.
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Real Effective Exchange Rate Misalignment in the Euro Area: A Counterfactual Analysis
Makram El-Shagi, Axel Lindner, Gregor von Schweinitz
Review of International Economics,
Nr. 1,
2016
Abstract
The European debt crisis has revealed severe imbalances within the Euro area, sparking a debate about the magnitude of those imbalances, in particular concerning real effective exchange rate misalignments. We use synthetic matching to construct a counterfactual economy for each member state in order to identify the degree of these misalignments. We find that crisis countries are best described as a combination of advanced and emerging economies. Comparing the actual real effective exchange rate with those of the counterfactuals gives evidence of misalignments before the outbreak of the crisis: all peripheral countries appear strongly and significantly overvalued.
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College Choice Allocation Mechanisms: Structural Estimates and Counterfactuals
J.-R. Carvalho, T. Magnac, Qizhou Xiong
Abstract
We evaluate a simple allocation mechanism of students to majors at college entry that was commonly used in universities in Brazil in the 1990s and 2000s. Students first chose a single major and then took exams that select them in or out of the chosen major. The literature analyzing student placement, points out that this decentralized mechanism is not stable and is not strategy-proof. This means that some pairs of major & students can be made better off and that students tend to disguise their preferences using such a mechanism. We build up a model of performance and school choices in which expectations are carefully specified and we estimate it using cross-section data reporting choices between two medical schools and grade performances at the entry exams. Given those estimates, we evaluate changes in selection and students’ expected utilities when other mechanisms are implemented. Results highlight the importance of strategic motives and redistributive effects of changes of the allocation mechanisms.
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Lingering Illness or Sudden Death? Pre-exit Employment Developments in German Establishments
Daniel Fackler, Claus Schnabel, J. Wagner
Industrial and Corporate Change,
Nr. 4,
2014
Abstract
Using a large administrative data set for Germany, this article compares employment developments in exiting and surviving establishments. Applying a matching approach, we find a clear “shadow of death” effect reflecting lingering illness: in both West and East Germany establishments shrink dramatically already several years before closure, employment growth rates differ strongly between exiting and surviving establishments, and this difference becomes stronger as exit approaches. Moreover, we provide first evidence that prior to exit the workforce becomes on average more skilled, more female, and older in exiting compared to surviving establishments. These effects are more clearly visible in West than in East Germany.
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Corporate Venture Capital, Value Creation, and Innovation
Thomas J. Chemmanur, Elena Loutskina, Xuan Tian
Review of Financial Studies,
Nr. 8,
2014
Abstract
We analyze how corporate venture capital (CVC) differs from independent venture capital (IVC) in nurturing innovation in entrepreneurial firms. We find that CVC-backed firms are more innovative, as measured by their patenting outcome, although they are younger, riskier, and less profitable than IVC-backed firms. Our baseline results continue to hold in a propensity score matching analysis of IPO firms and a difference-in-differences analysis of the universe of VC-backed entrepreneurial firms. We present evidence consistent with two possible underlying mechanisms: CVC's greater industry knowledge due to the technological fit between their parent firms and entrepreneurial firms and CVC's greater tolerance for failure.
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Geriet die preisliche Wettbewerbsfähigkeit von Euroraum-Ländern nach Gründung der Währungsunion aus dem Gleichgewicht?
Makram El-Shagi, Axel Lindner, Gregor von Schweinitz
Wirtschaft im Wandel,
Nr. 3,
2014
Abstract
Waren die Peripherieländer im Euroraum am Vorabend der Eurokrise nicht mehr wettbewerbsfähig? Oder war die preisliche Wettbewerbsfähigkeit in den Kernländern wie Deutschland ungewöhnlich hoch? Antworten auf diese Fragen sind nicht einfach. Das gängige Maß für die preisliche Wettbewerbsfähigkeit sind die realen effektiven Wechselkurse. Deren Bestimmungsfaktoren waren jedoch kurz vor der Krise selbst möglicherweise nicht im Gleichgewicht und lassen daher kaum Rückschlüsse auf gleichgewichtige Wechselkurse zu. Um dieses Messproblem zu umgehen, wird ein Matching-Ansatz zur Schätzung realer effektiver Wechselkurse verwendet. Dazu wird für jedes Mitgliedsland des Euroraums ein synthetisches Vergleichsland als Kombination mehrerer anderer Länder konstruiert, die den Euro nicht eingeführt haben. Es zeigt sich, dass die Peripherieländer des Euroraums am besten durch eine Mischung von Schwellenländern und entwickelten Volkswirtschaften beschrieben werden, während für ein Matching der Kernländer keine Schwellenländer notwendig sind. Die hier angewendete Methode zeigt, dass die realen effektiven Wechselkurse in den Peripherieländern zwischen Oktober 2007 und September 2008 teilweise deutlich zu hoch waren, während sie in den Kernländern mehr oder weniger nah bei ihrem Gleichgewichtsniveau lagen.
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Real Effective Exchange Rate Misalignment in the Euro Area: A Counterfactual Analysis
Makram El-Shagi, Axel Lindner, Gregor von Schweinitz
Abstract
Were real effective exchange rates (REER) of Euro area member countries drastically misaligned at the outbreak of the global financial crisis? The answer is difficult to determine because economic theory gives no simple guideline for determining the equilibrium values of real exchange rates, and the determinants of those values might have been distorted as well. To overcome these limitations, we use synthetic matching to construct a counterfactual economy for each member as a linear combination of a large set of non-Euro area countries. We find that Euro area crisis countries are best described by a mixture of advanced and emerging economies. Comparing the actual REER with those of the counterfactuals gives sensible estimates of the misalignments at the start of the crisis: All peripheral countries were strongly overvalued, while high undervaluation is only observed for Finland.
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Is There a Gap in the Gap? Regional Differences in the Gender Pay Gap
Boris Hirsch, Marion König, Joachim Möller
Scottish Journal of Political Economy,
Nr. 4,
2013
Abstract
In this paper, we investigate regional differences in the gender pay gap both theoretically and empirically. Within a spatial model of monopsonistic competition, we show that more densely populated labour markets are more competitive and constrain employers’ ability to discriminate against women. Utilizing a large administrative data set for western Germany and a flexible semi-parametric propensity score matching approach, we find that the unexplained gender pay gap for young workers is substantially lower in large metropolitan than in rural areas. This regional gap in the gap of roughly 10 percentage points remained surprisingly constant over the entire observation period of 30 years.
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Subsidized Vocational Training: Stepping Stone or Trap? – Assessing Empirical Effects using Matching Techniques
Eva Dettmann, Jutta Günther
Swiss Journal of Economics and Statistics,
Nr. 4,
2013
Abstract
Using replacement matching on the basis of a statistical distance function we try to answer the question of whether subsidized vocational training is related to a negative image effect for the graduates. The results show that young people with equal qualifications acquired during subsidized vocational training are disadvantaged solely due to the kind of education they have received. The probability of finding adequate employment is lower than in the control group. Besides the 'general effect' of support we also find less favorable job opportunities for those who attended 'external' as compared to 'workplace-related' training.
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A Control Group Study of Incubators’ Impact to Promote Firm Survival
Michael Schwartz
Journal of Technology Transfer,
Nr. 3,
2013
Abstract
It is widely unclear as to whether start-up firms supported by publicly-initiated incubator initiatives have higher survival rates than comparable start-up firms that have not received support by such initiatives. This paper contributes to the underlying discussion by performing a large-scale matched-pairs analysis of the long-term survival of 371 incubator firms (after their graduation) from five German incubators and a control group of 371 comparable non-incubated firms. The analysis covers a 10-year time span. To account for the problem of selection bias, a non-parametric matching approach is applied to identify an appropriate control group. For neither of the five incubator locations, we find statistically significant higher survival probabilities for firms located in incubators compared to firms located outside those incubator organizations. For three incubator locations the analysis reveals statistically significant lower chances of survival for those start-ups receiving support by an incubator. The empirical results, therefore, raise some doubts regarding the impacts of incubation on long-term firm survival.
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