我国中小投资者法律保护影响股权集中度的变化吗?

本文收集了1992年5月以来国家颁布的关于中小投资者利益保护的法律法规,以1990—2003年深沪两市的A股股票为样本,分别检验首次发行股票的公司上市时(IPO时)股权集中度和上市后股权集中度与中小投资者法律保护的立法和执法之间的关系。实证结果发现,在我国股权集中度的下降不完全是中小投资者法律保护的结果,IPO发行制度的演变、与股权集中度相关的中小投资者法律保护的立法相对较少、政府对国有股权转让的严格管理、非国有控股公司在保持实际控制权的条件下减少控股比例以获取自身利益,也可能导致股权集中度的下降。     

"中国之谜"-文献综述和一个假说

本文首先就"中国之谜"产生的背景及其争论进行了总结分析。然后通过引入以资本市场为代表的虚拟经济部门将传统的局限于实体经济部门的货币数量论拓展为包括资本市场、商品市场和货币市场的广义货币数量论模型,在新模型框架下分析了"中国之谜"的生成机理;我们发现大量货币在资本市场的积聚是货币供应量与物价关系反常的直接原因。"中国之谜"是货币虚拟化过程中虚拟经济和实体经济关系失调的结果。     

二十年农村政治研究的演进与转向——兼论一段公共学术运动的兴起与终结

近20年来的农村政治研究是中国大陆人文社会科学研究的一个重要构成,同时又是一场产生了重要政治与社会影响的“公共学术运动”,作为一个具有双重特征的学术“事件与过程”,它产生于二十世纪九十年代前后,“终止”于最近几年,而在实际上成为历史。本文将这一“事件与过程”安放回形塑其生长、发展的历史平台,以此来厘清研究的因由,勾勒其所呈现的学术与非学术轨迹,总结其影响和得失。     

提高信息披露质量真的能降低股权资本成本吗?

现有研究认为在我国提高信息披露质量有助于降低股权资本成本。但这些研究都是从横截面角度论证的,也没有论证这一结论的前提条件是否成立。本文则以2002—2004年度深圳上市公司为样本,从时间角度比较了上市公司信息披露考核评级变化前后的资本成本变化。结果发现,提高信息披露质量并没有降低股权资本成本。进一步的研究发现,这主要是由于我国投资者并没有把信息披露质量作为判断公司价值和交易股票的一个影响因素,由此导致提高信息披露质量无法增加流动性和降低风险。这表明提高信息披露质量降低资本成本的前提条件无法成立。     

医保基金收支管理的若干法律思考

医疗保险制度的运行是以基金的收支为纽带,基金收支关涉企业、职工、医保机构、医疗机构和各级政府的切身利益.目前从法律视角对医保基金收支进行研究十分欠缺,以致于现行医保制度实施中有关基金收入与结算支付的法律关系仍然处于相当混沌的状态.本文分析了医保基金筹集、医保基金支付结算及医保基金管理的法律关系,界定了医保基金收付中各个主体之间的权利义务关系.     

Effective property rights, conflict and growth

This paper shows how the interaction between conflict and growth can give rise to a nonmonotone relationship between property rights and social welfare. This interaction is illustrated in a model of endogenous growth in which equilibrium diversion of resources is the cost of securing effective property rights. A symmetric equilibrium allocation associated with more secure property rights and faster growth can be Pareto dominated by one associated with poorer property rights and slower growth. Faster growth can exacerbate the problem of diversion whenever property rights are sufficiently poor. These results call for caution before a society decides to pursue economic growth independently of the institutional structure of property rights. Furthermore, if this structure is inappropriate piecemeal reform might not be in the interest of society, and a substantial reform might be necessary if it is to be welfare-improving.     

温州民营资本跨区域投资的特征、成因及影响分析

该文对温州民营资本跨区域投资的特征、成因和影响进行了分析,认为温州民营资本跨区域投资具有资金来源的地缘集中和投资流向集中的显著特征,而温州企业集群老化、企业集群所具有的信息传递网络效应和民营资本应对不利的投资环境是形成上述特征的关键,在此基础上分析了温州民营资本跨区域投资对我国区域经济和温州本身经济发展带来的影响。     

Sample attrition and labor force dynamics: Evidence from the Spanish labor force survey

In this paper we examine a number of issues that arise in investigating labor force dynamics using the Spanish Labor Force Survey (EPA). These issues are by no means specific to the Spanish case and apply to most European-style labor force surveys. Our main conclusions may be summarized as follows. First, survey nonresponse cannot be neglected. Second, the EPA tends to underestimate employment and participation of high-educated young people, and to overestimate those of the low-educated elderly. Finally, we find little evidence that attrition causes important selection biases in estimating quarterly transition probabilities.     

The dynamics of inter-firm networks in the course of the industry life cycle: the role of appropriability

This paper examines the dynamics of inter-firm networks and introduces a conceptual framework for explaining why inter-firm networks change over time. The framework is based on the idea that patterns of inter-firm linkages are linked to the life cycle development of an industry. Special emphasis is placed on the role of appropriabiliy, i.e. a firm's ability to capture the profits generated by its innovations. The (trans)formation of inter-firm networks in three industries is examined and used to illustrate the relevance of the framwork. One important inference from our study is that public policy makers and manageers should take into account the phase of industry development before implementing policies to create and/or change inter-firm networks.     

The Bioeconomics of Marine Sanctuaries

Consider an offshore fishing grounds of size K. Suppose the grounds has been overfished to the point that net revenue has been driven to zero and the fishery is in open access equilibrium at (X, Y). A marine sanctuary, where fishing is prohibited, is then created. Suppose the marine sanctuary is of size K₂ and that fishing is allowed on a smaller grounds, now of size K₁, where K₁ + K₂ = K. In the first, deterministic, model, the present value of net revenue from the grounds-sanctuary system is maximized subject to migration (diffusion) of fish from the sanctuary to the grounds. The size of the sanctuary is varied, the system is re-optimized, and the populations levels, harvest, and value of the fishery is compared to the 'no-sanctuary' optimum, and the open access equilibrium. In the deterministic model, a marine sanctuary reduces the present value of the fishery relative to the 'ideal' of optimal management of the original grounds. In the second model net growth is subject to stochastic fluctuation. Simulation demonstrates the ability of a marine sanctuary to reduce the variation in biomass on the fishing grounds. Variance reduction in fishable biomass is examined for different-sized sanctuaries when net growth on the grounds and in the sanctuary fluctuate independently and when they are perfectly correlated. For the stochastic model of this paper, sanctuaries ranging in size from 60 to 40% of the original grounds (0.6 K₂/K 0.4) had the ability to lower variation in fishable biomass compared to the no sanctuary case. For a sanctuary equal to or greater than 70% of the original grounds (K₂ 0.7K), net revenue would be nonpositive and there would be no incentive to fish.