Publication records

Consumers often do not have complete information about the choices they face and therefore have to spend time and effort in acquiring information. Since information acquisition is costly, consumers trade-off the value of better information against its cost, and make their final product choices based on imperfect information. We model this decision using the rational inattention approach and describe the rationally inattentive consumer’s choice behavior when she faces alternatives with different information costs. To this end, we introduce an information cost function that distinguishes between direct and implied information. We then analytically characterize the optimal choice probabilities. We find that non-uniform information costs can have a strong impact on product choice, which gets particularly conspicuous when the product alternatives are otherwise very similar. There are significant implications on how a seller should provide information about its products and how changes to the product set impacts consumer choice. For example, non-uniform information costs can lead to situations where it is disadvantageous for the seller to provide easier access to information for a particular product, and to situations where the addition of an inferior (never chosen) product increases the market share of another existing product (i.e., failure of regularity). We also provide an algorithm to compute the optimal choice probabilities and discuss how our framework can be empirically estimated from suitable choice data.

© 2019, INFORMS

We study the optimal inventory policy of a firm selling an item whose price is affected by an exogenous stochastic price process which consequently affects customer arrivals. This case is typical for retailers that operate in different currencies, or trade products consisting of commodities or components whose prices are subject to market fluctuations. We assume that there is a stochastic input price process for the inventory item which determines purchase and selling prices according to a general selling price function. We also assume that unit demands arrive according to a doubly-stochastic Poisson process which is modulated by the stochastic input price process. We analyze optimal ordering decisions for both backorder and lost-sale cases. We show that under certain conditions a price-dependent base stock policy is optimal. The models are then extended to a price-modulated compound Poisson demand case. We present a numerical study on the sensitivity of the optimal profits to various parameters of the operational setting and stochastic price process such as price volatility, customer sensitivity to price changes etc. In another numerical setup, we compare the model with a corresponding discrete-time benchmark model that ignores within period price fluctuations and present the optimality gap when using the benchmark model as an approximation.

With permission of Elsevier

In the absence of externalities, marginality is equivalent to an independence property that rests on Harsanyi‘s dividends. These dividends identify the surplus inherent to each coalition. Independence states that a player‘s payoff stays the same if only dividends of coalitions to which this player does not belong to change. We introduce notions of marginality and independence for games with externalities. We measure a player‘s contribution in an embedded coalition by the change in the worth of this coalition that results when the player is removed from the game. We provide a characterization result using efficiency, anonymity, and marginality or independence, which generalizes Young‘s characterization of the Shapley value. An application of our result yields a new characterization of the solution put forth by Macho-Stadler et al. (J Econ Theor, 135, 2007, 339-356) without linearity, as well as for almost all generalizations put forth in the literature. The introduced method also allows us to investigate egalitarian solutions and to reveal how accounting for externalities may result in a deviation from the Shapley value. This is exemplified with a new solution that is designed in a way to not reward external effects, while at the same time it cannot be assumed that any partition is the default partition.

 

View all ESMT Working Papers in the ESMT Working Paper Series here. ESMT Working Papers are also available via SSRN, RePEc, EconStor, and the German National Library (DNB).

The article addresses the question of the digital dependencies of the public sector and the way in which government performs its tasks in the digital sphere. It examines the use of ICT and digital platforms, the development of digital competencies in public authorities and the overall ability to manage digital sovereignty. In particular, it highlights the role of the law and proposes three approaches for shaping regulation to strengthen digital sovereignty.

[Der Beitrag beschäftigt sich mit der Frage der Abhängigkeiten des Staates und staatlicher Aufgabenerfüllung im digitalen Raum. Er untersucht die Nutzung von IKT und digitalen Plattformen, die Kompetenzentwicklung in Behörden und die übergreifende Fähigkeit zum Management digitaler Souveränität. Besonders intensiv beleuchtet er die Rolle des Rechts und schlägt drei Ansätze vor, die Weiterentwicklung der Regulierung zur Stärkung digitaler Souveränität zu nutzen.]

Although the topic of aging at work is receiving increasing research attention, it remains unclear if aging employees are less innovative at work and what consequences this relation entails. We integrate the literature on aging with research on innovation to gain a better understanding of whether—and if so, when—employees’ aging harms their professional outcomes via decreased innovative behavior. Multi-source, time-lag data on 305 project managers provides support for the idea that age does not always go hand in hand with low innovative behavior and, subsequently, low professional outcomes. Rather, inter-departmental collaboration works as a social buffer for these negative effects. Specifically, aging employees with low inter-departmental collaboration are less innovative and subsequently less successful. In contrast, the “age handicap” vanishes when aging employees collaborate with other members in their organizations. Our results highlight the importance for organizations to foster collaboration among their members, either formally or informally.

© 2019 Wiley Periodicals, Inc.

This is a set of six vignettes (presented in a paper version and in a video version) designed to help undergraduate and graduate students, as well as participants in executive education programs recognize the differences between six leadership styles identified by the work of Litwin & Stringer (1971) and further popularized by Goleman (2000), Goleman, Boyatzis, & McKee (2013), and Korn & Ferry (2017). The vignettes present employee descriptions of their superior’s behaviors that are indicative of one of the six leadership styles: directive, visionary, affiliative, participative, pacesetting, and coaching. The vignettes, each describing a typical application of a particular style, can be used in class for the purpose of developing students’ leadership style diagnostic skills, as a group discussion material, or as test material for post-class examination.

This case study contains a video that is available with English, Chinese and Russian subtitles.