Static observables of relativistic three-fermion systems with instantaneous interactions

We show that static properties like the charge radius and the magnetic moment of relativistic three-fermion bound states with instantaneous interactions can be formulated as expectation values with respect to intrinsically defined wavefunctions. The resulting operators can be given a natural physical interpretation in accordance with relativistic covariance. We also indicate how the formalism may be generalized to arbitrary moments. The method is applied to the computation of static baryon properties with numerical results for the nucleon charge radii and the baryon octet magnetic moments. In addition we make predictions for the magnetic moments of some selected nucleon resonances and discuss the decomposition of the nucleon magnetic moments in contributions of spin and angular momentum, as well as the evolution of these contributions with decreasing quark mass.Comment: 13 pages, including 2 figures and 3 tables, submitted to Eur.Phys.J.

The core in the presence of externalities

We generalise the coalition structure core to games in partition function form. In our definition we make only one assumption, namely that there is some internal consistency in the game: Residuals of the deviation play a game similar to the initial one, and come to a residual core outcome – whenever this is possible. Deviating players form their optimistic or pessimistic expectations with this in mind. This leads to a recursive definition of the core. When compared to existing approaches, our core concept shows a reduced sensitivity to behavioural assumptions. We look at the core of an economy with a common pool resource defined by Funaki and Yamato (1999) and find that for a number of numerical examples our core concept resolves the contradiction, which arose when more naive approaches were used. Possibilities for further extensions are outlined.

Globalization, Migration and Development: The Role of Mexican Migrant Remittances

This note starts from the premise that, in current debates on the impact of globalization on economic development, the role of international migration has been under-emphasized. In an effort to contribute toward filling that gap, it presents evidence suggesting that remittances sent by international migrants are associated with improved developmental outcomes. Using a cross-section of all Mexican municipalities (over 2400) in the year 2000, it shows that an increase in the fraction of households receiving international remittances is correlated with better schooling and health indicators, and with reductions in poverty. These results are confirmed when we look at migration propensity instead of remittance flows. The econometric exercises control for the likely endogeneity between remittances and migration variables, on the one hand, and developmental outcome variables, on the other.Remittances, migration, globalization, development, Mexico

R&D-Persistency, Metropolitan Externalities and Productivity

Firms display persistent differences as regards both internal and external characteristics, and these differences correspond to asymmetries in the performance of firms with regard to productivity level and growth as well as innovativeness. This paper focuses on one internal characteristic and one external factor by distinguishing between firms with persistent R&D efforts and other firms and firms located in a metropolitan region versus firms with other locations. Applying Swedish data on individual firms and their location, the paper shows that firms that follow a strategy with persistent R&D efforts have a distinctly higher level of productivity across all types of location. In addition, the productivity level of firms with persistent R&D is augmented in a significant way when such firms have a metropolitan location and, in particular, a location in a metropolitan city

THE RELATIONSHIP BETWEEN ECOTOURISM CLUSTERS AND INNOVATION MILIEU IN THE REGION OF SOUTH-EASTERN EUROPE

Ecotourism destinations can be characterised with typically standalone tourismsuppliers. Although competition can be useful, but often cooperation among such smalloperators yields significantly better overall results. Harmonising nature conservation andtourism is also an important condition of sustainability. Availability of financial assets is also important; but contrary to conventional wisdomthe main questions is not the capital available for innovation or the government’s grants.According to research, success does not depend on the support of the government, butprimarily on the environment, or the so-called milieu of innovation (CAMAGNI, P.R. 1992).Based on our research we can develop ecotourism clusters in peripheral EU countries thatare economically and socially successful and at the same time provide a liveableenvironment.Innovative environment (milieu), Ecotourism, Ecotourism Clusters, Networks, Spatialdevelopment

The Core in a Normal Form Game

Due to the externalities, in normal form games a deviation changes the payoff of all players inducing a retaliation by the remaining or residual players. The stability of an outcome depends on the expectations potential deviators have about this reaction, but so far no satisfactory theory has been provided. The present paper continues the work of Tulkens and Chander (1997) where deviators consider residual equilibria, but we allow coalitions to form, moreover introduce consistency between the residual solution and the solution of the original game. Optimistic and pessimistic considerations produce a pair of cores. These cores are compared to some existing cooperative concepts such as the g- and r-cores and the equilibrium binding agreements. In our final section we discuss the predominance of the grand coalition and suggest a generalisation of the normal form where such a precedence can be removed.

THE ROLE OF CONTROLLING AND ITS ADMISSION WITHIN SMS ENTERPRISES IN HUNGARY – ESPECIALLY IN THE HOSPITALITY INDUSTRY

In last decades, international competition has become an increasingly importantfactor in many industries. Managers in the new environmental demands need more relevant costand performance information on the organization’s activities, processes, products, services andcustomers. This article is an attempt to identify and investigate the role of Controlling and itsimplementation within hungarian SMS Enterprises in the Hospitality Industry.Controlling, Competitiveness, USALI

Identifying the Motives of Migrant Philanthropy

Donations by migrants to community projects in their home countries ("collective remittances") help to provide local public goods and may promote economic development. We draw on the literatures on migrant remittances and on philanthropy in general to identify possible motives for collective remittances

The Spatial Distribution of Human Capital: Can It Really Be Explained by Regional Differences in Market Access?

This paper checks for the robustness of the estimate of the impact of market access on the regional variability of human capital, derived from the NEG literature. The hypothesis is that the estimate of the coefficient of the measure of market access is actually capturing the effect of regional differences in the industrial mix, and the spatial dependence in the distribution of human capital. Results for the Spanish provinces indicate that the estimated impact of market access vanishes and becomes non-significant once these two elements are included in the empirical analysis.

Intra firm and extra firm networks in the German knowledge economy. Economic development of German agglomerations from a relational perspective

Flows and inter-linkages between and within polycentric metropolitan regions have become a fundamental topic in regional sciences. The knowledge economy as a primary driver of spatial restructuring is forming these relations by generating knowledge within a spatially fine graded division of labor. This process drives companies to cooperate in intra firm and extra firm networks which in turn evoke patterns of interdependent spatial entities. The aim of the paper is twofold. Firstly, we analyze spatial patterns within these firm networks and secondly we combine this network approach with the development of the economic and spatial structure of German agglomerations. Inspired by formal social network analysis and spatial association statistics we apply methods to discover spatial clustering within relational data. We assume that relations between and within polycentric Mega-City Regions in Germany and its neighboring areas constitute a new form of hierarchical urban systems. Network analysis will help to detect locations of high centrality; cluster analyses of location-based data may show specific regional patterns of connectivity. We hypothesize that the position of locations within the functional urban hierarchy depends on the spatial scale of analysis: global, European, national or regional. Furthermore, we combine this relational perspective with an analysis of the economic development within these spatial entities. Here we assume that intensive interaction between functional urban areas has a high influence on their performance over time with regard to output indicators like labor, value-added and gross domestic product. Therefore we apply methods of spatial and network autocorrelation. We hypothesize that relational proximity influences economic development more intensively than effects of agglomeration and geographical proximity do.