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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

"Principled Embeddedness": How foreign direct Investment may contribute to inclusive and sustainable growth in developing economies?

Foreign direct investment (FDI) plays a crucial role in enabling developing economies to embark on a path of inclusive growth. This applies in particular if local subsidiaries of multinational enterprises (MNEs) are committed to ‘principled embeddedness’ meaning that they are prepared to integrate parts of the local economy into global value chains by enabling them to comply with the…

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English / 23/11/2017

Sustainable and Future Oriented Cocoa Production in Ghana: Analysis of the Initiatives of two Swiss Chocolate Manufacturers

Sustainability remains high on the worldwide agenda in the cocoa sector as numerous problems threaten its viability. This study gives a broad picture of the Ghanaian cocoa sector and examines the initiatives of two Swiss chocolate manufacturers aiming at a more sustainable and future-oriented cocoa production in Ghana.
The study reveals many challenges the Ghanaian cocoa sector…

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English / 23/11/2017

Embeddedness of Chiquita’s Banana Production in Panama: The potential to mitigate social and ecological problems

The study examines the banana production operations of Chiquita in the remote region of Changuinola in Panama and contrasts it with experiences from Guatemala and Costa Rica. Of particular interest are the local context and the socio-economic framework conditions in which the company is operating. They are essential to assessing the embeddedness of the company in the region. Moreover…

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English / 23/11/2017

Positive Sustainability Effects Resulting from Embeddedness: Evidence from Syngenta’s potato business in Kenya and Colombia

A variety of studies assess the impact of multinational enterprises (MNE) in developing countries. They mainly focus on the negative externalities of these companies. Therefore, this study focuses on the positive effects emanating from the presence of MNEs in developing countries. It is hypothesised that positive externalities resulting from MNEs have their source in the local…

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English / 23/11/2017

KYC Optimization Using Distributed Ledger Technology

The know-your-customer (KYC) due diligenceprocess is outdated and generates costs of up to USD 500million per year per bank. The authors propose a newsystem, based on distributed ledger technology (DLT), thatreduces the costs of the core KYC verification process forfinancial institutions and improves the customer experi-ence. In the proposed system, the core KYC verificationprocess…

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English / 15/11/2017

Schadenfreude: A counter-normative observer response to workplace mistreatment

Although almost all employees have heard of or witnessed their colleagues being mistreated, we have an incomplete understanding of how employees perceive and respond to such events. Whereas past research has established that observer emotions can be congruent with victim emotions, we examine observer schadenfreude, an incongruent emotion that is also prevalent in organizations. Based…

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English / 09/11/2017

Numerical implementation of the QuEST function

Certain estimation problems involving the covariance matrix in large dimensions are considered. Due to the breakdown of finite-dimensional asymptotic theory when the dimension is not negligible with respect to the sample size, it is necessary to resort to an alternative framework known as large-dimensional asymptotics. Recently, an estimator of the eigenvalues of the population…

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English / 01/11/2017

The welfare effects of vertical integration in multichannel television markets

We investigate the welfare effects of vertical integration of regional sports networks (RSNs) with programming distributors in U.S. multichannel television markets. Vertical integration can enhance efficiency by reducing double marginalization and increasing carriage of channels, but can also harm welfare due to foreclosure and incentives to raise rivals' costs. We estimate a…

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English / 01/11/2017

Improving weighted least squares inference

These days, it is common practice to base inference about the coefficients in a hetoskedastic linear model on the ordinary least squares estimator in conjunction with using heteroskedasticity consistent standard errors. Even when the true form of heteroskedasticity is unknown, heteroskedasticity consistent standard errors can also used to base valid inference on a weighted least…

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English / 01/11/2017

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