FEMM - Working Paper Series - 2017
17020 |
Yue Huang
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Abstract: |
Evidence on a causal link between family size and children’s education, as in the tradeoff suggested by Gary S. Becker between child quantity and quality, is still inconclusive. Recent empirical studies have focused heavily on China, exploiting for identification the country’s One-Child Policy (OCP) as an exogenous source of variation in the number of offspring. This literature, however, suffers from measurement error in the key policy variable (individual OCP coverage) and the use of inadequate measures of child quality outcomes (educational attainment). Using a novel and more accurate taxonomy of provincial OCP regulations and studying exclusively post-compulsory schooling outcomes of children that are subject to parental discretion, we find evidence for a sizeable child quantity-quality trade-off in China. Various robustness checks corroborate this conclusion. |
JEL: | J13, J18, I2 |
Keywords: | Family Size, Education, One-Child Policy, Quantity-Quality Trade-Off |
17019 |
Norman Belas/Paul Bengart/Bodo Vogt
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Abstract: |
Clinical trials play a decisive role in the drug approval processes. By completing a p-curve analysis of a newly compiled data set that consists of thousands of clinical trials, we substantiate that the occurrence of p-hacking in clinical trials is not merely hypothetical. Medical and pharmaceutical research consists of both primary and secondary study endpoints. The primary finding covers the main effect, which directly influences the approval process, while the secondary outcome delivers further additional information. For primary p-curves, we observed an abnormal increase in the p-value frequency at common significance thresholds, while the secondary p-curves exhibited no such anomaly. |
JEL: | C18, H51 |
Keywords: | P-hacking, Publication Bias, Reporting Bias, Clinical Trials |
17018 |
Karl-Peter Schackmann-Fallis/Horst Gischer/Mirko Weiß
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Abstract: |
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JEL: | |
Keywords: | |
17017 |
Josephine Clemens
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Abstract: |
Dealing with supply risks is one of the challenges of decision makers in supply chains as producing and sourcing become more and more complex. Theoretical research on different types of supply uncertainty as well as their management is well covered. Behavioral aspects in this context, however, have not received much attention so far. In this paper, we present an experimental study which aims at investigating how subjects make decisions of ordering and producing in the presence of random production yields at a supplier, i.e. production output is a random fraction of production input. Subjects were confronted with the situation of either the buyer or the supplier in a simple two-tier supply chain with deterministic demand and had to make the respective quantity decisions. Results show that buyers have a good understanding of the situation and are likely to follow a probabilistic choice rule. In addition to that, hedging against supply risks drives their behavior of over-ordering. Suppliers on the other hand start off with moderate production decisions but improve over time which indicates learning effects. Furthermore, the study shows that additional sharing of information on yield rates is no cure for inefficient behavior of the buyer. |
JEL: | |
Keywords: | Behavioral operations management, supply chain interaction, random yield, supply risk |
17016 |
Felix Bransch/Michael Kvasnicka
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Abstract: |
Using data on articles published in the top-five economic journals in the period 1991 to 2010, we explore whether the gender composition of editorial boards is related to the publishing success of female authors and to the quality of articles that get published. Our results show that female editors reduce, rather than increase, the share of articles that are (co-)authored by females. We also find evidence that female editors benefit article quality at low levels of representation on editorial boards, but harm article quality at higher levels. Several robustness checks corroborate these findings. Our results are broadly consistent with existing evidence on the behavior of gender-mixed hiring committees and of relevance for gender equality policy. |
JEL: | A14, J16, J71 |
Keywords: | Gender bias, Citations, Journals, Editors |
17015 |
Sebastian Till Braun/Anica Kramer/Michael Kvasnicka
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Abstract: |
This paper studies the persistence of a large, unexpected, and regionally very unevenly distributed population shock, the inflow of eight million ethnic Germans from Eastern Europe to West Germany after World War II. Using detailed census data from 1939 to 1970, we show that the shock had a persistent effect on the distribution of population within local labor markets, but only a temporary effect on the distribution between labor markets. These results suggest that locational fundamentals determine population patterns across but not within local labor markets, and they can help to explain why previous studies on the persistence of population shocks reached such different conclusions. |
JEL: | J61, R12, R23, N34 |
Keywords: | Population shock, locational fundamentals, agglomeration economies, regional migration, postwar Germany |
17014 |
Michael Karas/Roland Kirstein
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Abstract: |
The German copyright law was reformed in the end of 2016 with the purpose of ensuring reasonable pecuniary compensation to authors. It proposes an option which entitles authors to negotiate copyright transfers with an additional publisher after a vesting period of ten years. The results of a two-stage bargaining model show that the proposed copyright system may actually harm authors, as publishers may internalize a potential impairment on profits from increased competition within contract negotiations. This paper also demonstrates that the publisher's willingness to invest into an author's career is strictly decreasing as the level of expected rivalry increases. |
JEL: | C78, K23, L82, L88, O34, Z18 |
Keywords: | Institutional Regulation, Copyright Law, Bargaining, Creative Industries, Efficient Contracting |
17013 |
Michael Karas/Roland Kirstein
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Abstract: |
The American copyright act from 1976 allows authors to terminate their copyright grants after a certain vesting period if these are not categorized as work made for hire. The literature suggests substantial effects on the author-publisher relationship because in negotiations publishers may internalize the harm from a termination decision. This paper illuminates the internalization problem and shows that contracts should be designed differently for terminating and non-terminating authors. The total remuneration offered by the initial publisher is strictly lower for authors who terminate. This paper also points out the limits of the copyright law under scrutiny considering additional institutional regulations and existing market norms. |
JEL: | C78, K23, L82, L88, O34, Z11 |
Keywords: | Efficient Contracting, Termination Right, Copyright Law, Bargaining, Author-Publisher Relationship |
17012 |
Karina Held/Abdolkarim Sadrieh
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Abstract: |
In a controlled laboratory experiment, we study the impact of monetary instability on work relationships with incomplete contracts. We observe wage inertia, i.e. the reluctance to fully adjust nominal wages to the changes in the value of the currency, and effort inertia, i.e. the reluctance to fully adjust the work effort to the alterations of the real wages. Under inflation, these effects lead to cheaper labor and a shift of payoff shares to employers. Under deflation, we observe a higher cost of labor and a shift of payoff shares to employees. Additionally, inflation and deflation lower productivity and per capita earnings. |
JEL: | C91, E31, J31, M54 |
Keywords: | |
17011 |
Henriette Koch/Maximilian Schlögell/Andreas Bortfeldt
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Abstract: |
In this paper, a variant of the vehicle routing problem with mixed backhauls (VRPMB) is presented, i.e. goods have to be delivered from a central depot to linehaul customers, and, at the same time, goods have to be picked up from backhaul customers and brought to the depot. Both types of customers can be visited in mixed sequences. |
JEL: | |
Keywords: | vehicle routing, backhauls, tabu search, packing |
17010 |
Dirk Männel
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Abstract: |
We extend the classical Pickup and Delivery Problem (PDP) to an integrated routing and two-dimensional loading problem, called PDP with two-dimensional loading constraints (2L-PDP). A set of routes of minimum total length has to be determined such that each request is transported from a loading site to the corresponding unloading site. Each request consists of a given set of 2D rectangular items with a certain weight. The vehicles have a weight capacity and a rectangular two-dimensional loading area. All loading and unloading operations must be done exclusively by movements parallel to the longitudinal axis of the loading area of a vehicle and without moving items of other requests. Furthermore, each item must not be moved after loading and before unloading. |
JEL: | |
Keywords: | Transportation, vehicle routing, packing, pickup and delivery |
17009 |
Michael Mitzkewitz
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Abstract: |
This paper calculates the Harsanyi-Selten solutions for a class of simple signaling games. This means that for each generic game belonging to this class one of its equilibrium points is selected according to the principles developed by John C. Harsanyi and Reinhard Selten (Harsanyi & Selten, A General Theory of Equilibrium Selection in Games, 1988). For almost fifty years signaling games have been of great interest for both normative game theorists and scientists in-terested in the analysis of social, cultural and biological phenomena. The paper provides an introduction into the Harsanyi-Selten theory, solves all generic games and subsumes the results. Thus comparisons to Nash refinement concepts can easily be done and the solution of more complex games is facilitated. |
JEL: | C72 |
Keywords: | Noncooperative Game Theory, Signaling Games, Equilibrium Selec-tion, Harsanyi-Selten theory, Risk Dominance, Tracing Procedure |
17008 |
Alexander Erler/Horst Gischer/Bernhard Herz
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Abstract: |
Competition in the US banking industry as measured by the Lerner Index has on average increased substantially during the last decade. At the same time, regional differences in competition on the state level have decreased considerably. Based on a dynamic panel framework we find that these developments are mainly driven by industry specific factors such as the costs to income ratio. The empirical evidence indicates that inefficiency and the Lerner index are significant negatively correlated. Macroeconomic conditions appear to have supported these trends in competition, however, to a somewhat lesser extent. |
JEL: | D40, G21, L19 |
Keywords: | competition, US banking, efficiency, regional markets |
17007 |
Daniel Schubert/André Scholz/Gerhard Wäscher
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Abstract: |
Supermarkets typically order their goods from a centrally located distribution center (warehouse). Each order that the warehouse receives is characterized by the requested items, the location of the respective supermarket and a due date by which the items have to be delivered. For processing an order, a human operator (order picker) retrieves the requested items from their storage locations in the warehouse first. The items are then available for shipment and loaded on the vehicle which performs the tour including the respective location of the supermarket. Whether and to which extent a due date is violated (tardiness) depends on the composition of the tours, the corresponding routes and the start dates of the tours (vehicle routing subproblem). The start date of a tour, however, is also affected by the assignment of orders to pickers and the sequence according to which the orders are processed by the pickers (order picking subproblem). Although both subproblems are closely interconnected, they have not been considered simultaneously in the literature so far. In this paper, an iterated local search algorithm is designed for the simultaneous solution of the subproblems. By means of extensive numerical experiments, it is shown that the proposed approach is able to generate high-quality solutions even for large instances. Furthermore, the economic benefits of an integrated solution are investigated. Problem classes are identified, where the sequential solution of the subproblems leads to acceptable results, and it is pointed out in which cases an integrated solution is inevitable. |
JEL: | |
Keywords: | Vehicle Routing, Order Picking, Parallel Machine Scheduling, Iterated Local Search |
17006 |
Sandra Hahn/André Scholz
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Abstract: | Mail order companies like Zalando or Amazon reported a significant increase regarding the number of incoming customer orders in recent years. Customers are served from a central distribution center (warehouse) where requested items of the orders have to be retrieved (picked) from their storage locations. The picking process is performed by human operators (order pickers) who are employed on a large scale in order to enable a fast processing of the orders. However, due to limited space, aisles are often very narrow in warehouses, and order pickers cannot pass or overtake each other. Thus, an order picker may have to wait until another picker has performed his/her operations. The arising waiting times may significantly increase the processing times of the orders, implying that a large number of pickers does not guarantee for small processing times. Therefore, in this paper, the impact of several problem parameters on the amount of waiting time is investigated first and situations are identified where the consideration of waiting times is inevitable for an efficient organization of the picking process. In the second part of the paper, a solution approach, namely a truncated branch-and-bound algorithm, is proposed which aims for the minimization of the waiting times. By means of extensive numerical experiments, it is demonstrated that this approach provides high-quality solutions within a very small amount of computing time. |
JEL: | |
Keywords: | Order Picking, Picker Routing, Picker Blocking |
17005 |
Henriette Koch/Andreas Bortfeldt/Gerhard Wäscher
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Abstract: |
This paper deals with a special vehicle routing problem with backhauls where each customer receives items from a depot and, at the same time, returns items back to the depot. Moreover, time windows are assumed and three-dimensional loading constraints are to be observed, i.e. the items are three-dimensional boxes and packing constraints, e.g. regarding load stability, are to be met. The resulting problem is the vehicle routing problem with simultaneous delivery and pickup (VRPSDP), time windows, and three-dimensional loading constraints (3L-VRPSDPTW). This problem occurs, for example, if retail stores are supplied by a central warehouse and wish to return packaging material. |
JEL: | |
Keywords: |
vehicle routing, backhauls, three-dimensional loading constraints, large neighbourhood search |
17004 |
Tino Henke/M. Grazia Speranza/Gerhard Wäscher
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Abstract: |
Multi-compartment vehicle routing problems arise in a variety of problem settings in which different product types have to be transported separated from each other. In this paper, a problem variant which occurs in the context of glass waste recycling is considered. In this problem, a set of locations exists, each of which offering a number of containers for the collection of different types of glass waste (e.g. colorless, green, brown glass). In order to pick up the contents from the containers, a fleet of homogeneous disposal vehicles is available. Individually for each disposal vehicle, the capacity can be discretely separated into a limited number of compartments to which different glass waste types are assigned. The objective of the problem is to minimize the total distance to be travelled by the disposal vehicles. |
JEL: | |
Keywords: | vehicle routing, multiple compartments, branch-and-cut algorithm, waste collection |
17003 |
Peter Reichling/Anastasiia Zbandut
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Abstract: |
Credit risk analysis represents a growing field in financial research since decades. However, in company valuation to be more precise, in cost of capital computations credit risk is merely taken into consideration at the level of the debt beta approach. Our paper proves that applications of the debt beta approach suffer from unrealistic assumptions. As an advantageous approach, we develop an alternative framework to determine costs of capital based on Merton’s model. We present (quasi-) analytic formulas for costs of equity and debt which are consistent with Modigliani-Miller theory in continuous-time and discrete-time settings without taxes. Our framework is superior to the debt beta approach regarding the quantity and quality of required data in peer group analysis. Since equity and debt are represented by options in Merton’s model, we compute expected option rates of return without resorting to betas. Thereby, our paper also contributes to the option pricing literature. |
JEL: | G13, G32, G33 |
Keywords: | Company valuation, debt beta, expected option return, Merton’s model, WACC |
17002 |
Andreas Welling
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Abstract: |
Various so-called green investments are intended to limit the warming of the earth's climate, thus minimizing social, environmental and economic damage. The article introduces into the corresponding research field of Green Finance by providing current data, by showing historical developments, and by forecasting future tasks. Further, the article depicts the major difficulties of research on Green Finance; particularly rapid technological progress, the dependence of governmental support, high uncertainties, and, especially the interactions of so many actors. Finally, the article gives a short review on the research field of Green Finance. |
JEL: | |
Keywords: | |
17001 |
Andreas Welling
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Abstract: |
Carbon taxation is used by several countries to internalize the negative effects of carbon emissions to the emitters of carbon. In this article the effects of a carbon tax on an oligopolistic market of polluters are analyzed. With the help of a multi-criteria optimization model the optimal carbon tax rate is determined; first under certainty and then in presence of demand uncertainty. It is shown that demand uncertainty leads to a lower optimal carbon tax rate, while it simultaneously increases carbon emissions. Finally, the influence of a possible carbon emission reducing investment is analyzed with the help of a real option model. |
JEL: | |
Keywords: | Carbon Tax; Climate Change; Real Option; Technological Progress; Uncertainty; Oligopolistic competition |