中国对外直接投资与"走出去"战略:理论基础与经验分析

伴随着中国经济国际竞争力的不断增强和国家"走出去"战略的逐步实施,中国已成为新兴的对外直接投资来源地。本文立足于发展中国家对外直接投资的相关理论,通过统计资料、问卷调查及案例等多种方法,系统分析我国对外直接投资的现状与特征,并从对外直接投资的发展阶段、国际地位与跨国公司的发展三个角度对我国对外直接投资与理论预期和国际水平的差距进行了比较研究,论证了我国现阶段实施"走出去"战略的必要性和紧迫性。     

基于SE—DEA的电力企业效率评估

针对传统数据包络分析(DEA)模型不能对有效决策单元做进一步比较的现实情况,文章引入了重新定义生产可能集的SE-DEA模型,创造性地克服了传统模型的这一缺点,实现了对所有决策单元的充分评价与排序.接着以沪深股市火力发电上市公司为例进行实证,在论证它们符合SE-DEA模型应用假设条件的基础上,验证了该模型在评价企业效率方面的有效性.     

Divergence of the world city system from national economies

This study shows that the position of cities in the world economy has diverged from national economies. Using data from 2016, we evaluate a network of 12,802 cities formed by the location decisions of 24,355 firms in terms of their point centrality, and show that the inter-city and inter-national systems have measurably decoupled, disrupting the previously-observed pattern in which the most powerful cities in the world city system were located in core countries, "mid-level" cities were in the semi-periphery,and the least powerful cities were in peripheral countries. Our findings support predictions that globalizing cities would diverge from national economies and that globalization would generate a new global geography that transects long-standing cleavages in the world system.