Returns from social capital in open source software networks

Open Source Software projects base their operation on a collaborative structure for knowledge exchange in the form of provision or reception of information, expertise and feedback on the creation of source code. Here, we address the direction of these knowledge flows among projects throughout social networks and their impact on project success. We identify the roles of membership or contribution that individuals play within projects. We found that connections through contributors who bring their knowledge to the project, improve project success, and that connection through members, who transfer their knowledge towards other projects, enhance project success. Finally, we found that ties through shared membership and contributions hamper project success. The analysis of knowledge flows and their impact on project success imply a translation of returns from investment in social capital, where investment takes the shape of knowledge flows and the returns mean the projects’ diffusion over the network.

Noncentral bimatrix variate generalised beta distributions

In this paper, we determine the density functions of nonsymmetrised doubly noncentral matrix variate beta type I and II distributions. The nonsymmetrised density functions of doubly noncentral and noncentral bimatrix variate generalised beta type I and II distributions are also obtained.     

现代物流与产业结构升级关联机制研究

运用协整检验方法,定量分析现代物流与产业结构升级之间的关系,研究结果发现,现代物流与产业结构升级之间存在长期稳定的均衡关系,产业结构升级率每提高1个百分点,物流贡献率增加0.140 018 7个百分点;并进一步利用灰色关联分析理论对现代物流贡献率与第二产业结构升级率和第三产业结构升级率的关联度进行测算,结果发现第二产业结构升级率与物流贡献率的关联度更高,这说明第二产业结构升级对我国现代物流业的发展具有较大的影响.     

Conditioning factors for corporate entrepreneurship: an in(ex)ternal approach

In the last years, the business creation and management literature has paid increasing attention to the entrepreneurship that occurs within organizations. Most empirical studies show a positive relationship between corporate entrepreneurship and performance. The objective of this article is to identify which internal and external factors condition corporate entrepreneurship. The study uses two different theoretical perspectives: Resource-Based Theory (for internal factors) and Institutional Economics (for external or environmental factors). Both theories have been widely used in the strategic management and entrepreneurship literature, however, very few studies in the corporate entrepreneurship field are grounded on them together. The research applies negative binomial regression and uses data from the Global Entrepreneurship Monitor (GEM) for the period 2004–2008. Overall the sample has 339.071 observations and it provides information for 9 different European countries (Greece, Spain, Italy, Ireland, the Netherlands, France, the United Kingdom, Denmark and Finland). Results reinforce the importance of internal factors (knowledge, personal networks and being able to identify business opportunities) compared to external (having fear of failure, media impact and the number of procedures to create a company). Contributions of the study are both theoretical and practical. On the one hand, it contributes to the development of the literature in the corporate entrepreneurship field. On the other hand, it provides useful insights for those companies that are interested in entrepreneurship within the organizations.     

ECONOMIC IMPLICATIONS OF POLICY RESTRICTIONS ON WATER WITHDRAWALS FROM SURFACE AND UNDERGROUND SOURCES

The appropriation of water for economic activities is limited by regional surface and underground endowments, and symptoms of environmentally unsustainable withdrawals are already visible in many regions of the world. In this paper we investigate the economic implications of water policy imposing source- and region-specific restrictions on water withdrawals taking the Mexican economy as a case study. We use an inter-regional input–output model of Mexico's hydro-economic regions to allocate production subject to the availability of water and other factors of production. Water sustainability requires a reduction of 7.5?km³/yr of groundwater withdrawals, which is compensated by an increase of 3.4?km³/yr of surface water, an expansion onto an additional 1.4 million hectares of rainfed land, and modifications in subnational patterns of food trade. This framework for evaluating scenarios describing sustainability-oriented water policies is readily applicable to other regions.     

Longitudinal analysis of entrepreneurship and competitiveness dynamics in Latin America

This study analyzes the relationship between entrepreneurial dynamics in Latin-American countries and the level of competitiveness these countries show. Based on the research conducted by Wennekers et al. [Small Business Economics, 24(3):293–309, 2005] that demonstrates a U-shaped relationship between the country’s rate of entrepreneurship and its level of competitiveness and economic development, we hypothesize that Latin-American countries have a descending behaviour under the U-shaped curve approach. The results from three regression models support this hypothesis and suggest that competitiveness and economic growth deter entrepreneurial dynamics on Latin-American countries. We discuss that Latin-American countries need to improve some structural factors to achieve a high level of entrepreneurial dynamics.

A model to evaluate transient industry effects

In this paper we present a model to evaluate transient industry effects, that is, the impact of business cycles on the industry. While the importance of the economic cycle for industry and firm performance is widely recognized, we do not know much about how much the business cycle influences industry activity. The aim of this paper is to present a method that helps to understand the relationship between the business cycle and an industry's level of activity. Copyright © 2008 John Wiley & Sons, Ltd.     

An empirical approach to the organisational determinants of spin-off creation in European universities

Given the importance in recent years of the phenomenon of academic entrepreneurship in European universities, knowledge about determinants and performance of this technology transfer mechanism may have important managerial and policy implications. Applying the resource-based view at universities, we have tested the influence of five bundles of resources and capabilities on spin-off activity rates as well as on the performance of new spin-offs in a sample of seven European universities. These five bundles are: technology transfer policies and strategies; human capital; stock of technology; resources and capabilities of technology transfer offices; and support measures for academic entrepreneurship. Our results show that excellence of human capital and the presence of university-based financial support measures are strongly associated with both spin-off activity and performance. Another interesting finding is related to the availability of university-based non-economic support measures (training, counselling, etc.), which have no influence on spin-off activity but are significantly associated with performance of new spin-offs. We also discuss some interesting relationships between explanatory variables.