Separable Preferences,Strategyproofness, and Decomposability

We consider strategyproof social choice functions defined over product domains. If preferences are strict orderings and separable, then strategyproof social choice functions must be decomposable provided that the domain of preferences is rich. We provide several characterization results in the case where preferences are separable only with respect to the elements of some partition of the set of components and these partitions vary across individuals. We characterize the libertarian social choice function and show that no superset of the tops separable domain admits strategyproof nondictatorial social choice functions.     

国库集中支付对科学事业单位财务管理的影响

分析国库集中支付制度的特点,以科学事业单位为切入点对国库集中支付制度进行了研究,并探讨了国库集中支付存在的问题,进而对政府和科学事业单位两个层面提出相应的改进建议。     

唐代文学繁荣现象的传播动因

唐代文学的全面繁荣有着多方面的原因,从文学传播的角度入手,将唐文学的传播置于一个完整的传播过程中予以审视,同时,分别从文学传播主体、讯息、传播手段、受传者和传播效果等五要素分析唐代文学传播条件的改善及其对唐文学的发展所起的积极影响,以期说明唐代文学传播的发达对文学繁荣有着巨大的促进作用。     

虚拟世界的真钱交易分析

虚拟物品的真钱交易是指用真实货币购买虚拟商品和虚拟货币.虚拟商品的价值在于它能给玩家带来效用,真钱交易的本质是商誉,商誉转移的过程则是买方为获得其使用权和所附加的娱乐价值而支付给卖方货币补偿的一种行为.真钱交易市场的出现对大型多用户在线角色类游戏最大的影响在于它产生了生产者剩余和消费者剩余,实现了社会福利水平的帕累托改进.     

Stress and tobacco use among African-American adolescents: the buffering effect of cultural factors

Tobacco is a leading contributor to morbidity and mortality and a primary reason for health disparities among African Americans. In this study we explore the role of stress in smoking and cultural factors that protect against stress among African-American adolescents. Our sample consisted of 239 youth who were recruited into the study while enrolled in 8th and 12th grade. Measures of risk factors (stress, school transition stress, and community disorganization), moderator or protective factors (religious support and intergenerational connections), and 30-day tobacco use were collected. Hierarchical multiple regression analyses were conducted. Intergenerational connections moderated the effect of stress on past 30-day tobacco use. Religious support moderated the effect of neighborhood disorganization on past 30-day tobacco use. Religious support also moderated the effect of stress on past 30-day tobacco use. The findings have implications for prevention efforts to consider religious beliefs and practices and also to link youth with supportive adults in their community.     

转变经济发展方式的矛盾、难点与出路

尽管转变经济发展方式在表达层面上已经形成共识,但在具体行动时却困难重重.早在"九五"计划时,我们就已经提出了实现经济增长方式的根本转变,但至今是"久推难转".干部政绩考核和选拔晋升制度的偏离、财政税收体制的缺陷,以及资源价格机制的扭曲这三个方面的原因阻碍了经济发展方式的转变.根本出路在于继续深化改革,切实转变政府职能,创新有利于经济发展方式转变的体制机制.     

Donating Time or Money? The Effects of Religiosity and Social Capital on Civic Engagement in Qatar

Few studies have examined the role of religiosity and social capital on civic engagement in the context of a Muslim country. In this paper, we explore the impact of religiosity and social capital on charitable donations and volunteerism in Qatar. Drawing on a nationally representative survey from Qatar, we consider various attitudinal and behavioral measures for capturing religiosity and social capital. The results indicate that, even after controlling for a wide range of demographic variables, behavioral measures have a stronger effect than attitudes. Individuals who regularly perform daily prayers are more likely to donate than those individuals who simply describe themselves as religious. Similarly, individuals who are more active in their neighborhood engagement are more likely to volunteer than those who merely report high levels of social trust. These results suggest that when it comes to the relationship between religiosity, social capital and civic engagement, individual behavior is much more predictive than attitudes alone. We also find that even in the case of Qatar, where citizen wealth has rapidly increased in the last few decades, there is little evidence of substitution effects: citizens do not appear to trade-off or substitute between time and money. Instead, more religious and active citizens are likely to do both.     

Implementing the right project structure to achieve coopetitive innovation projects

This research focuses on the project structure used by coopetitors to achieve common innovation projects. Scholars have recently identified an original but complex project structure that they call the Coopetitive Project Team (CPT). However, other project structures can also be implemented by coopetitors to achieve innovation. Therefore, we address the following question: for which types of innovation projects is CPT appropriate? We argue that coopetitors need to use CPT for high-risk and high-cost projects when the aim is to develop radical innovation. CPT allows coopetitors not only to develop innovation capabilities through close resource and knowledge sharing but also to manage the risk of opportunism. Conversely, coopetitors should use another project structure, Separated Project Teams (SPTs), for low-cost and low-risk projects when the aim is to develop incremental innovation. The SPT design allows coopetitors both to achieve the goal of the project and to minimize the risk of opportunism. To confirm our assumptions, we studied the project portfolios of Airbus and Thales, two firms in the space satellite industry. Our findings confirm that coopetitors should implement CPTs to handle innovation projects that are costly, risky and highly innovative. CPTs permit the sharing of knowledge and the management of high opportunism risk, both of which are necessary to achieve radical innovation. Conversely, coopetitors rely on SPTs for low-cost projects that require a low degree of knowledge sharing, thus avoiding the risk of opportunism in achieving their incremental innovation objectives.     

Adjexpectile风险测度的性质、优化及资产配置的应用

金融风险的度量和识别是风险管理的重要内容,常用的风险度量工具是标准差、VaR、ES,但存在很多缺陷,expectile的提出弥补了这些不足,在理论界得到广泛的讨论和应用。本文扩展了expectile进行资产配置,提出Adjexpectile的概念,并讨论和分析了Adjexpectile的一致性风险度量、随机占优性、凸性,与标准差、VaR、shortfall的关系,风险贡献及风险分解的性质。通过对六个资产指数：上证国债指数、上证企业债指数、上证180指数、深圳100指数、深成长40p指数和黄金现货指数的复合周收益率数据进行组合优化配置,发现Adjexpectile在非对称性收益数据、组合前沿、风险分散方面具有一定的优越性。     

DO TERRORIST ATTACKS IMPACT EXCHANGE RATE BEHAVIOR? NEW INTERNATIONAL EVIDENCE

This study examines whether terrorist attacks affect bilateral exchange rates. Using historical 10‐minute exchange rate data for 21 countries' currency vis‐à‐vis the U.S. dollar, we show that exchange rate returns of all countries are statistically significantly affected by terrorist attacks. Some exchange rates appreciate and some depreciate following a terrorist attack, some currencies experience exchange rate reversals while others experience a persistent effect. Generally, the effect declines but persists as terrorist attacks become stale information. (JEL F31, F37)