Electron spin precession in semiconductor quantum wires with Rashba spin-orbit coupling

The influence of the Rashba spin-orbit coupling on the electron spin dynamics is investigated for a ballistic semiconductor quantum wire with a finite width. We monitor the spin evolution using the time-dependent Schr\"odinger equation. The pure spin precession characteristic of the 1D limit is lost in a 2D wire with a finite lateral width. In general, the time evolution in the latter case is characterized by several frequencies and a nonrigid spin motion.Comment: 7 pages, 9 figure

Más vale malo conocido: elementos de juicio sobre los costos de ingreso que encaran los bancos extranjeros

(Disponible en idioma inglés únicamente) Las diferencias institucionales y jurídicas entre los países hacen aumentar los costos de entrada y reducen la capacidad de los bancos de expandirse en el exterior. Empleamos datos de la banca extranjera bilateral de 176 países para calcular un modelo de gravedad que explique la actividad bancaria bilateral, además de variables estándar, mediante diferencias jurídicas e institucionales. Hallamos que la banca foránea se ve afectada negativamente por diferencias absolutas del marco legal y de las instituciones básicas entre los países de origen y receptores. Por ejemplo, las diferencias en el origen legal reducen la participación bilateral en el sistema bancario en casi 11%. Además, no hallamos elementos de juicio sólidos que sugieran una asimetría en la adaptación a entornos institucionales o jurídicos mejores o peores.

Open and closed industry clusters: The social structure of innovation

In this paper we discuss knowledge and innovation in clusters and the benefits of clustering from a knowledge-based perspective. Knowledge-based resources and innovations are important sources of competitive advantage for firms. Aware of the importance of continuously seeking new knowledge firms increasingly seek knowledge-rich locations such as specific industry clusters across the world. These are locations characterized by the concentration of firms operating in related and supporting activities, a specialized work force and a specialized institutional environment that nurtures the industry. However, it is not likely that these clusters are always locations from which the firms will be able to draw the intended knowledge benefits. The social structure of the relationships between individuals and firms determines the extent to which knowledge will be created, will flow between co-located firms and bounds the knowledge benefits the firms may capture. We finish with a discussion of the need of further examination of the network dynamics involved in an industry cluster to obtain a clearer identification of the actual positive externalities that may accrue to co-locating firms.Strategy; Industry clusters; Innovation

Make or Buy in a mature industry? Models of client-supplier relationships under TCT and RBV perspectives

In this paper, we use the transaction cost theory (TCT) and the resource-based view (RBV) to discuss three propositions on the models of client-supplier relationships in mature industries. The two theories seem to advance different organizational forms of the client-supplier relationships, and in some instances contradictory. How should firms organize to prosper and grow, namely in the international markets? Through the case study of three Portuguese packaging firms, with primary (interviews) and secondary data, we discuss how the three firms deploy three distinct strategic organization models in a mature industry. One firm utilizes market-based governance mechanisms, and concentrates its production in a few selected locations. Another firm vertically integrates almost the entire value chain of the product to provide full service to its clients. The third firm operates in a model of integrated outsourcing, with the installation "wall to wall" to its clients. The models client-supplier assumed by these firms are based on efficient, stable, and trustworthy relationships, that permit the focus on their core competences and the reduction of the transaction costs. Firms? superior performance requires a proper alignment of hierarchical and relational governance taking in consideration the dimensions of the transactions.Client-supplier relationship models; Outsourcing; TCT; RBV; Strategic Governance

The impact of strategic resource seeking and market seeking strategies on foreign entry modes under institutional pressures

Multinational corporations (MNCs) are subject to the various dimensions of the external institutional environments where they operate. Institutional theory suggests that MNCs need to conform to the prevailing rules, norms and procedures of the locations where they operate in order to survive and grow. This means that MNCs need to develop the best possible configuration of strategy-structure for their worldwide operations. Previous research has noted that in these conditions firms may simply seek to follow a referent other. However, MNCs? specific strategy for a focal foreign operation is likely to determine the entry mode for each host country. That is, in certain circumstances it may be whether MNCs are pursuing a market-seeking strategy or a strategic resource seeking strategy that shapes the entry mode in face of the prevailing institutional pressures. We contribute to the understanding of entry modes into foreign markets as a reflection of a strategic choice that is bound by institutional constraints.strategic resource seeking, market seeking, institutional environment, foreign entry modes

Technology transfer within MNEs: An investigation of inter-subsidiary competition and cooperation

Much theory and research that seeks to explain why and how technology transfers occur within multinational enterprises (MNEs) actually addresses the question of how these transfers occur among cooperative subsidiaries, and relies on the assumption of inter-subsidiary cooperation. However, subsidiaries do not always cooperate. We suggest that the success of technology transfer among subsidiaries depends on the extent to which the relationships among an MNE's subsidiaries (i.e. inter-subsidiary) are competitive or cooperative. Inter-subsidiary cooperation is determined by the MNE's international strategy, organizational structure, and the social relationships among subsidiaries. Both hierarchical and social relational factors drive the potential for inter-subsidiary multimarket competition that originates from the overlap on the subsidiaries' products, technologies, and market portfolios.technology transfer, subsidiaries, competition and cooperation, international strategy

Visitors to the city of Évora: Who are they?

Nowadays, driven by multiple factors, tourist demand presents patterned behaviour which is subdivided into several typologies according to destination, product consumed and visitor profile features. In the case of cultural tourism, a good example is that of historic cities, which have their own cultural identity and heritage, and compete to make themselves different from one another through many marketing strategies. This study presents the profile of visitors to the World Heritage City of Évora, including their travel motivations and level of satisfaction with the attributes. Subsequently, the main purpose of this study is to determine the cultural profile of visitors to the World Heritage City of Évora. The data collection technique applied was a visitor survey. The process adopted for the sample definition was a probabilistic sampling, namely the adoption of a stratified sampling plan, by place of residence. Further analysis shows that the most important motivations for visitors in selecting Évora are leisure, heritage/monuments and having a new cultural experience. However they indicate the fact that Évora is considered World Heritage City by UNESCO did influence the decision to visit this destination. Several findings provide the opportunity to establish adequate managerial and marketing strategies to suit the needs of the visitors