Existence of a competitive equilibrium in a one sector growth model with heterogeneous agents and irreversible investment

Summary. We prove existence of a competitive equilibrium in a version of a Ramsey (one sector) model in which agents are heterogeneous and gross investment is constrained to be non negative. We do so by converting the infinite-dimensional fixed point problem stated in terms of prices and commodities into a finite-dimensional Negishi problem involving individual weights in a social value function. This method allows us to obtain detailed results concerning the properties of competitive equilibria. Because of the simplicity of the techniques utilized our approach is amenable to be adapted by practitioners in analogous problems often studied in macroeconomics. Received: September 13, 2001; revised version: December 9, 2002 RID="*" ID="*" We are grateful to Tapan Mitra for pointing out errors as well as making very valuable suggestions. Thanks are due to Raouf Boucekkine and Jorge Duran for additional helpful discussions. We also thank an anonymous referee for his/her helpful comments. The second author acknowledges the financial support of the Belgian Ministry of Scientific Research (Grant ARC 99/04-235 “Growth and incentive design”) and of the Belgian Federal Goverment (Grant PAI P5/10, “Equilibrium theory and optimization for public policy and industry regulation”). Correspondence to: C. Le Van     

Industry specific effects in investment performance and valuation of firms

A necessary criterion for a performance measure in corporate governance is the degree to which it mirrors how well the management succeeds in maximizing firm value. Such a performance measure is marginal q which links changes in firm value to the investments undertaken by the management. Empirical studies of investment and performance based on marginal q have demonstrated the usefulness of this measure. Most research however, has mainly focused on long-term performance. This paper takes a short-term perspective and, based on the marginal q-theory, considers how firms’ market values change in the extreme stock price cycle of a stock market bubble. Using a data set of listed Swedish corporations we find an anomaly in form of a new industry specific effect that, in addition to investment, explains changes in firm value.

Optimising a Probabilistic Model of the Development of Play in Soccer

We present a probabilistic model based on the one developed by Hernández Mendo and Anguera (Revista de Psicologíca Social, 16(1), 71–93, 2001). Here we have tried to break down the interaction contexts that the opposing teams are able to generate and transform during the game. We are aware that a given player or team does not produce consistent behaviour in similar situations. However, a degree of uncertainty is assumed to exist regarding whether the results obtained are a specific function of the analysis used. In order to carry out this research a category system which optimized that used in the previous model was developed. This system should enable the interaction between teams to be observed within the actual play of a soccer game. A lag sequential analysis was performed on the basis of a coding of the behavioural flow. After describing the behavioural patterns obtained a probabilistic model of the development of play in soccer is proposed.     

Influence analysis for Poisson inverse Gaussian regression models based on the EM algorithm

For Poisson inverse Gaussian regression models, it is very complicated to obtain the influence measures based on the traditional method, because the associated likelihood function involves intractable expressions, such as the modified Bessel function. In this paper, the EM algorithm is employed as a basis to derive diagnostic measures for the models by treating them as a mixed Poisson regression with the weights from the inverse Gaussian distributions. Several diagnostic measures are obtained in both case-deletion model and local influence analysis, based on the conditional expectation of the complete-data log-likelihood function in the EM algorithm. Two numerical examples are given to illustrate the results.     

Noch mehr Overheads in die Zentrale? — Marketing- und Vertriebsressourcen als internationale Erfolgstreiber

Die Leistungen der Unternehmenszentrale stehen h?ufig unter scharfer Kritik, da sie aus Sicht internationaler Führungskr?fte die Treiber der Overheadkosten sind. Der Wertsch?pfungsbeitrag, den die zentralen Abteilungen erbringen, wird hingegen nur selten diskutiert. Nur wenn zentrale Marketing- und Vertriebsabteilungen es schaffen, ihren Wertsch?pfungsbeitrag deutlich zu machen und auch in Taten umzusetzen, kann die Existenz zentraler Abteilungen langfristig gesichert und Synergien realisiert werden. Der folgende Beitrag zeigt, wie dies gelingen kann.     

The Virtues of Green Strategies: Some Empirical Support from the Alliance Context

Whilst strategic alliance performance has been extensively researched through the resource-based lens, it has yet to be examined under the natural-resource-based view (NRBV) of the firm. Building on the NRBV, this article argues that a firm’s level of environmental proactiveness affects its level of alliance satisfaction. The argument is tested by surveying Norwegian CEOs, and the results confirm a positive relationship. Moreover, the partner’s environmental proactiveness equally influences the focal firm’s satisfaction with the alliance, in consistent with related studies. In addition to providing new empirical evidence in support of the NRBV, and extending the alliance performance literature, the findings add to the corporate environmentalism literature by offering insights on the virtues of green strategies in an underexplored context.     

Strategic Compatibility Choice,Network Alliance,and Welfare

Based on a simple model of compatibility choice under differentiated Cournot duopoly with network externalities, we consider how the levels of a network externality and product substitutability affect the choice of compatibility. In particular, if the level of network externality is larger than that of product substitutability, there are multiple equilibria involving imperfect and perfect compatibility. Furthermore, we demonstrate the conditions for constructing such a network alliance so that firms provide perfectly compatible products. The network alliance is stable and socially optimal.     

The influence of variability and strategy of service supply chains on performance

This paper aims to empirically examine how customer-induced variability, process variability, supply chain strategy, and business performance interrelate in a service firm context. Quantitative data were collected via a questionnaire-based survey. A total of 376 organizations responded and 313 responses were usable. This represents an adjusted response rate of 10.43 %. The survey results were analyzed by factor analysis, ANOVA, and regression models. The results provided the basis for testing the proposed model. They indicated a positive association between customer-induced variability and process variability. Since firms have different levels of variability, each firm will have a different strategic focus. The emphasis of that strategy will, in turn, result in greater flexibility and customer satisfaction. More specifically, firms with high and low levels of variabilities are suggested to focus on the cost- and flexibility-oriented strategies, respectively.     

The Russian Tax System and Its International Competitiveness

The last several years were very favourable to the development of the Russian economy. While this has partly been the consequence of favourable conditions on the international markets for raw materials, the economic policy of President Vladimir Putin, including the tax reforms initiated at the end of the 1990s, also played a major role. Our authors examine in detail the effects of the tax reforms to date and point out the room for further improvements under Putin’s successor, Medvedev.