Prof. Dr.
Kai Hoberg

Publications

Professor of Supply Chain and Operations Strategy

Head of Logistics Department

Publications

Journal Articles (Peer-Reviewed)

Copy reference link   DOI: 10.1515/rmeef-2014-0037

Abstract: This study contributes to the banking efficiency literature by using a three input–five output stochastic frontier translog cost function specification to investigate cost efficiency, scale economies, and technological progress in the Egyptian banking sector. The study analyzes the efficiency of Egyptian banks in the period 2000–2006 which witnessed major regulatory and structural changes. The analysis is based on a panel data of 34 commercial banks representing about 75% of the banking sector in Egypt. The results show that the banks suffer significantly from internal X-inefficiency with an average cost reduction potential of 12%. Increasing economies of scale are found to exist up to a bank size of about EGP30 bn, implying that all but the four largest banks in Egypt could reduce their average costs by growth. Surprisingly, Egyptian commercial banks did not benefit from technological change; instead they faced a negative dynamics of the cost frontier. Further regression analysis conducted to explain the different efficiency levels of the banks revealed a positive impact of size, growth, and merger activities on efficiency, which implies bigger is better for Egyptian Banks.

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Copy reference link   DOI: 10.1007/s10584-007-9277-9

Abstract: Motivated by the high abatement costs of the Kyoto Protocol for Germany, this paper is estimating the economic impact of global warming on agriculture in that country. The hedonic approach is used as theoretical background. Stating that land prices are – among others – determined by climatic factors, this approach can consequently be used to value global warming. To avoid a priori restrictions stemming from functional forms, the land price function is modeled as quadratic Box–Cox function that nests a wide range of specifications. In a second step, the estimated results are used to forecast the impact of climate change. The results indicate that German farmers will be winners of climate change in the short run, with maximum gains occurring at a temperature increase of +0.6°C against current levels. In the long run, there may be losses from global warming. However, the net present value from climate change is under the most probable scenarios positive.

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Copy reference link   DOI: 10.1016/j.respol.2009.07.008

Abstract: Motivated by recent statistics that show significant growth in labor productivity, this paper seeks to analyze the long-term relationship between domestic R&D, knowledge stock and productivity dynamics. Time series data of the German manufacturing industry is used to estimate a variable cost function with the stock of knowledge being dependent upon current and past R&D spending. The estimates indicate that 50% of the effects of R&D on the knowledge stock appear within 4 years. However, the rate of return on R&D are shown to be drastically declining; recent rates of return on R&D are estimated to have reached an all-time low spanning the last 45 years. Current yields of R&D are only one third compared to the sixties. In conclusion, though the productivity slowdown of the seventies seems to have been overcome, this is not attributed to R&D investments.

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Copy reference link   DOI: 10.1007/s10888-004-7581-4

Abstract: Immigrants in Germany have poor earnings performance relative to natives. Claiming that human-capitalendowments determine earnings potentials rather than actual earnings, a stochasticearnings frontier is estimated and used to seek systematic differences between natives and migrantsfor GSOEP data for the year 2000. While empirical results clearly support the frontier assumption,natives and immigrants are surprisingly about the same with respect to the frontier. Assuming a halfnormaldistribution of the wage gap, on average, both groups transform a modest 84% share of theirpotential income into market earnings. This implies wage inequality can be attributed to humancapitaldifferentials alone. The human-capital endowments of immigrants are largely determinedby the very low percentage who have college degrees, their slow assimilation and zero-return onimported experience. The paper also tries to explain individual wage gaps, which are significantlydecreased in married subjects raising families, but increased in employees in small- or medium-sizedrelative to larger firms. However, these variables only make minor contributions to the variance.

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Abstract: Die Krise der Medienindustrie ist im wesentlichen eine Krise des Werbemarktes. Angesichts eines Beitrages der Werbung in Höhe von zwei Dritteln zum Umsatzaufkommen der Massenmedien überrascht dies nicht,wird aber durch das vorliegende Zahlenmaterial noch einmal bestätigt. Dieser Beitrag geht der Frage nach, ob der beobachtete Einbruch die historischen Zyklen der Werbebranche bestätigt, oder ob ein Strukturbruch und damit ein Zerfall der bisherigen Zyklusmuster stattgefunden hat. Hierzu werden in einem ersten Schritt mit Hilfe der Spektralanalyse die in der Vergangenheit dominierenden Zyklen identifiziert. Als Datenmaterial stehen die Werbeausgaben von 1960 bis 2003 auf Jahresbasis zur Verfügung, wobei die Werbeausgaben nach vier Mediengattungen differenziert sind. In einem zweiten Schritt werden die identifizierten Zyklen als erklärende Variable in ein Regressionsmodell eingefügt, um deren Erklärungsbeitrag zu den historisch beobachteten Veränderungsraten des Werbemarktes zu bestimmen. Es zeigt sich, dass die beobachteten Veränderungsraten relativ gut durch das gemessene Zyklusgefüge mit sich überlagernden Einzelzyklen erklärt werden kann. Der Test auf Strukturbruch wird verworfen – zumindest bislang kann somit davon ausgegangen werden, dass die Krise des Werbemarktes das historische Zyklusmuster eher bestätigt als zerstört.

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Copy reference link   DOI: 10.1023/A:1011178931639

Abstract: This study uses the concept of shadow prices for measuring the impacts of climate change. By estimating a restricted profit function rather than a cost or a production function the explanatory power of the model is increased because of an endogenous output structure. Using low aggregated panel data on Western German farmers, the results imply that the agricultural production process is significantly influenced by climate conditions. Simulation results using a 2 CO2 climate scenario show positive impacts for all regions in Germany. Interestingly, the spatial distribution of the gainsis indicating no advantage for those regions, which currently suffer from insufficient temperature. Finally, the importance of an endogenous output structure is confirmed by the finding that the desired product mix will drastically change.

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Copy reference link   DOI: 10.1023/A:1008130918565

Abstract: Based on an unbalanced panel of all Bavarian cooperative banks for the years of 1989--97, which includes information on 283 mergers, we analyze motives and cost effects of small-scale mergers in German banking. Estimating a frontier cost function with a time-variable stochastic efficiency term, we show that positive scale and scope effects from a merger arise only if the merged unit closes part of the former branch network. When we compare actual mergers to a simulation of hypothetical mergers, size effects of observed mergers turn out to be slightly more favorable than for all possible mergers. Banks taken over by others are less efficient than the average bank in the same size class, but exhibit, on average, the same efficiency as the acquiring firms. For the post-merger phase, our empirical results provide no evidence for efficiency gains from merging, but point instead to a leveling off of differences among the merging units.

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Copy reference link   DOI: 10.1023/A:1018346332447

Abstract: Using 1992 data of 1490 banks covering about 40% of German banking, we specify amulti-product translog cost function and follow the “thick frontier”-approach to control for cost inefficiency when evaluating the technology of banking. Scale economies are found to exist up to a size of about 5 billion DM of total assets, with diseconomies being caused by non-operating costs. There is hardly any evidence of economies of scope. Compared to cost inefficiency external factors play a surprisingly strong role in explaining cost differences between high-cost and low-cost banks. Smaller banks turn out to be more responsive to input prices.

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Copy reference link   DOI: 10.2307/20714861

Abstract: This article applies a modern empirical test of conduct to assess competitive conditions in the German banking sector. The elasticity of total revenues with respect to changes in input prices is calculated, using the intermediation approach as model of the banking firm. The functional form of the revenue equation is specified as a Translog function. The empirical basis consists of a panel of 1432 German universal banks with an observation period of at least four years for each of them. To account for potential consequences of the distinct regulatory environment and average bank size, the estimations are run separately for the three subgroups „cooperative banks”, „savings banks” and „credit banks”. The empirical results are consistent with the behavior of monopolistic competition, rejecting significantly the hypotheses of both monopoly and perfect competition. Differences between the subgroups turned out to be small, rejecting a causality from market share on market behavior.

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Abstract: Im Mittelpunkt dieser Studie steht die Fragestellung, in welchem Ausmaß Gewinnunterschiede und Marktanteilsveränderungen auf Effizienzunterschiede zwischen den Unternehmen zurückzuführen sind. Hierzu wird in einem ersten Schritt mit Hilfe des Fixed-Effects- sowie des Stochastic-Frontier-Ansatzes die unternehmensspezifische Kosteneffizienz bestimmt. In einem zweiten Schritt wird dann der Zusammenhang zwischen Kosteneffizienz einerseits und den Marktergebnisvariablen Profitabilität sowie Marktanteilsveränderung andererseits untersucht. Dieser Zusammenhang ist um so enger, je wettbewerblicher das Unternhemnsverhalten ist. Für den deutschen Bankensektor, repräsentiert durch Paneldaten von 1425 deutschen Universalbanken, deuten die Berechnungen auf sigifikante Unterschiede zwischen den Bankengruppen hin. Während die Gewinne von Genossenschaftsinstituten relativ stark von der Kosteneffizienz beeinflußt werden, ist dies bei Sparkassen sowie Kreditbanken kaum der Fall. Untersucht man dagegen die Beziehung zwischen Marktanteilsentwicklung und Effizienz, dann ist der Erklärungsgehalt für den Sparkassensektor größer als für die beiden anderen Bankengruppen.

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Abstract: Discussions among politicians and farmers about a reform of the EC's Common Agricultural Policy ignored one important aspect: Is there an interdependence between outputlevels and factor productivity? The paper provides an empirical answer to this question by estimating a non-homothetic flexible functional form with four inputs (labour, capital, land, material) for the West-German agricultural sector. As a main result, the traditional measure of the Total Factor Productivity, the Solow-residual, overestimates the isolated technical progress by about 1% because of scale economies. If lower product prices and higher direct payments to the farmers lead to output reductions, this will also induce a less efficient production.

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Abstract: New empirical evidence on the factual as opposed to the formal independence of the Deutsche Bundesbank is presented. Estimating monetary reaction functions for the Federal Republic of Germany we try to identify a direct influence of electoral cycles and an indirect influence of government deficits on monetary policy. Whereas there are clear indications for the indirect mechanism, the data does not show a direct influence as long as the model is specified with Nordhaus-cycles. Using the more recent rational partisan theory, however, yields evidence for a relationship between election dates, election outcomes, and money supply changes.

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Journal Articles (Professional)

Copy reference link   DOI: 10.1016/0378-4266(95)00040-2

Abstract: Using 1989–1992 individual data of 757 German cooperative banks and applying the intermediation approach we specify a multi-product translog cost function for this part of the German banking industry. For all size classes moderate economies of scale can be identified. There is also evidence of economies of scope which supports the notion of universal banking. As for cost efficiency, we find that the average banks in all size classes deviate considerably from the best practice cost frontier. All banks enjoy growth of total factor productivity, which is higher for the smaller banks in the sample.

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