Does ethnic diversity decrease economic interactions? Evidence from exchange networks in rural Gambia

Using a unique dataset collected in 59 rural Gambian villages, we study how ethnic heterogeneity is related to the structure of four economic exchange networks: land, labour, inputs and credit. We find that different measures of village‐level ethnic fragmentation are mostly uncorrelated with network structure. At a more disaggregated level, household heads belonging to ethnic minorities are not less central than those from the predominant ethnicity in any of the networks and, at the dyadic level, the fact that two households share ethnicity is not an economically significant predictor of link formation. Our results indicate that, in the particular setting of our study, the structure of the exchange networks is better defined by other variables than ethnicity and that ethnic heterogeneity is unlikely to be a driver for sub‐optimal economic exchanges.     

全球化下珠三角本土企业创新网络的演变及影响因素研究——基于顺德东菱凯琴集团和珠海德豪润达集团的对比实证

创新网络是经济地理学研究的前沿主题之一。通过考察东菱和德豪润达两家本土家电企业自成立以来创新网络的演变过程,发现两家企业的创新网络的演变呈现出较大的差异。通过进一步的研究发现,珠三角本土企业创新网络的演变是全球化和地方化因素共同影响的结果,而全球化下的"供应商-客商"关系、企业发展战略、区域内企业之间的互动关系与区域性的制度安排和环境是影响珠三角本土企业创新网络演变的主要因素。     

网络安全综合评价方法的应用研究

文章分析了计算机网络运行存在的风险;并从分段技术、加密技术、防火墙技术和抗病毒技术方面探讨了如何防范安全风险。     

Is group selection necessary? An alternative interpretation of homogeneous Middleman groups: Comments on Janet Landa’s paper

This article critiques the efforts by Janet Landa, David Sloan Wilson and others to use group selection paradigms to explain the success of homogenous middlemen groups (HMGs). It argues that group selection theory cannot explain the conflicts of interests that arise within HMGs or why they dissolve in certain occasions. Landa’s earlier explanations, which stressed the combination of genetic (kinship) and social bonds in the creation of trust and cooperation in the extension of credit and the creation of local public goods, better predicts both the strength and weaknesses of HMGs.      

复杂网络视角下突发性公共卫生危机管理

本文从复杂网络的视角重新审视了突发性公共卫生事件的危机管理。研究结果表明,复杂网络的小世界特性和无标度特性为突发性公共卫生危机的传播带来了新的挑战,在突发性公共卫生危机的传播过程中,采用切断超级传播者、隔离、免疫、信息公开与反馈等措施可以收到不同程度的危机预防和控制效果。本文结合传统的预防-处理-善后三阶段危机管理体系,提出了复杂网络视角下的突发性公共卫生危机管理政策建议。     

基于政策网络治理模式下的区域政府间合作

政策网络治理是政策网络理论与治理理论研究相结合形成的新的治理流派,是公共治理的一种新框架和新模式,代表着治理主体、治理工具、治理结构、治理机制的深刻变迁.随着全球经济一体化和中国加入WTO,中国经济的发展步伐的不断加快,在政策网络治理模式下的区域政府之间的合作正在逐步形成,但在进程中遇到的问题也日益凸显.面对这些问题,文章在政府合作必要性及存在问题原因分析的基础上,对地方政府间的合作进行了对策设计,以期提高区域合作的效果和水平.     

Lineage-based heterogeneity and cooperative behavior in rural China

This paper investigates how lineages, the commonly found organizations in rural villages of China, affect people's intra- and cross-lineage cooperative behavior. We use data from the Chinese Household Income Project Survey 2002, which exclusively contains information about the lineage structure in these villages allowing us to classify three levels of lineage-based heterogeneity. Our identification strategy relies on the exogeneity of lineage-based heterogeneity. We find evidence that people in a village with higher lineage-based heterogeneity are less likely to exhibit reciprocity behavior within lineages or contribute to the provision of public goods that are jointly shared across lineages. The estimation results remain robust to the inclusion of various control variables and additional background characteristics. Finally, we examine a number of other economic outcomes and find that more homogenous villages do better than other types of villages.