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Rethinking large-scale economic modeling for efficiency: optimizations for GPU and Xeon Phi clusters

We propose a massively parallelized and optimized framework to solve high-dimensional dynamic stochastic economic models on modern GPU- and MIC-based clusters. First, we introduce a novel approach for adaptive sparse grid index compression alongside a surplus matrix reordering, which significantly reduces the global memory throughput of the compute kernels and maps randomly accessed...

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English / 01/01/2018

Shareholder Risk Measures

The aim of this paper is to put forward a new family of risk measures that as the coherent/convex risk measures impose a preference order on random cash flows and can be interpreted as prices. But at the difference of the axiomatic approach of Artzner, Delbaen, Eber and Heath (1999) and the subsequent extensions of this model, our risk measures are associated with the optimal...

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English / 01/01/2018

Business Ethics and Human Rights. The Industrial Involvement in the Embeddedness of the Tibetan Community in Rikon, Switzerland: A Case Study

This case study discusses the complex socio-cultural and political dynamics of the Tibetan Diaspora in Switzerland from a multilayer perspective of history, human rights, law, international business, social and developmental economics. We focus on the village Rikon in Tösstal, Canton Zurich as an example of social embeddedness for refugees driven by the Kuhn-Rikon industry and...

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English / 01/01/2018

Daten gegen Armut

Neue Methoden zeigen Spendern, wofür sich das Geldgeben wirklich lohnt. Ein Gastbeitrag von Johannes Haushofer, Dina Pomeranz, Max Roser und Frank Schilbach

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Deutsch / 22/12/2017

Long-range growth: economic development in the global network of air links

We study the impact of international long-distance flights on the global spatial allocation of economic activity. To identify causal effects, we exploit variation due to regulatory and technological constraints which give rise to a discontinuity in connectedness between cities at a distance of 6,000 miles. We show that improving an airport’s position in the network of air links has a...

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English / 20/12/2017

In search of new product ideas: Identifying ideas in online communities by machine learning and text mining

Online communities are attractive sources of ideas relevant for new product development and innovation. However, making sense of the ‘big data’ in these communities is a complex analytical task. A systematic way of dealing with these data is needed to exploit their potential for boosting companies' innovation performance. We propose a method for analysing online community data...

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English / 09/12/2017

Predictors of parental leave support: Bad news for (big) dads and a policy for equality

Parenthood increases gender inequality in paid (employment) and unpaid labor (e.g., caretaking). New parental leave plans aim to increase gender equality by reducing managerial discretion and offering gender-neutral benefits. However, coworkers may undermine these inclusive aims, particularly if they show variable support per employee characteristics. Thus, we examine why and how...

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English / 08/12/2017

Auctioning risk: The all-pay auction under mean-variance preferences

We analyse the all-pay auction with incomplete information and variance-averse bidders. We characterise the unique symmetric equilibrium for general distributions of valuations and any number of bidders. Variance aversion is a sufficient assumption to predict that high-valuation bidders increase their bids relative to the risk-neutral case while low types decrease their bid....

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English / 01/12/2017

Laboratory measure of cheating predicts school misconduct

Laboratory experiments provide insights into the drivers of cheating behaviour, but it is unclear to what extent cheating in the lab generalizes to the field. We conducted an experiment with middle and high school students to test whether a common laboratory measure of cheating predicts three types of school misconduct: (i) disruptiveness in class, (ii) homework non-completion, and (...

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English / 01/12/2017

Optimal search from multiple distributions with infinite horizon

With infinite horizon, optimal rules for sequential search from a known distribution feature a constant reservation value that is independent of whether recall of past options is possible. We extend this result to the the case when there are multiple distributions to choose from: it is optimal to sample from the same distribution in every period and to continue searching until a...

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English / 01/12/2017

A note on the analysis of two-stage task results: how changes in task structure affect what model-free and model-based strategies predict about the effects of reward and transition on the stay probability

Many studies that aim to detect model-free and model-based influences on behavior employ two-stage behavioral tasks of the type pioneered by Daw and colleagues in 2011. Such studies commonly modify existing two-stage decision paradigms in order to better address a given hypothesis, which is an important means of scientific progress. It is, however, critical to fully appreciate the...

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English / 01/12/2017

Cumulative prospect theory and mean-variance analysis: a rigorous comparison

We propose a numerical optimization approach that can be used to solve portfolio selection problems including several assets and involving objective functions from cumulative prospect theory (CPT). Implementing the suggested algorithm, we compare asset allocations that are derived for CPT based on two different methods: maximizing CPT along the mean–variance efficient frontier so...

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English / 01/12/2017

Competitive pricing reduces wasteful counterproductive behaviors

Counterproductive reactions to unfavorable trading prices can cause inefficiencies in economic exchange. This paper studies whether the use of a competitive pricing mechanism reduces such wasteful activities. We report data from a laboratory experiment where a powerful buyer can trade with one of two sellers—an environment that can lead to very low prices for the sellers. We find...

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English / 01/12/2017

The Code is the Model

Conventionally, agent-based models are specified in a combination of natural language and mathematical terms, and their implementation seen as an afterthought. I challenge this view and argue that it is the source code that represents the model best, with natural language and mathematical descriptions serving as documentation. This modeling paradigm is inspired by agile software...

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English / 01/12/2017

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