Minimum cost spanning tree problems with indifferent agents

We consider an extension of minimum cost spanning tree (mcst) problems in which some agents do not need to be connected to the source, but might reduce the cost of others to do so. Even if the cost usually cannot be computed in polynomial time, we extend the characterization of the Kar solution (Kar, 2002) for classic mcst problems. It is obtained by adapting the Equal treatment property: if the cost of the edge between two agents changes, their cost shares are affected in the same manner if they have the same demand. If not, their changes are proportional to each other. We obtain a family of weighted Shapley values. Three interesting solutions in that family are characterized using stability, fairness and manipulation-proofness properties.     

Axiomatization of the core of assignment games

The core of assignment games is characterized by two different lists of axioms. The first list consists of Pareto optimality, consistency, pairwise monotonicity, and individual monotonicity. The second list is obtained from the first one replacing the last axiom by population monotonicity. As a corollary, individual monotonicity and population monotonicity are equivalent under the other axioms. The core is also characterized by the second list on the restricted domain in which the worth of each pair is non-negative and every reservation value is zero.     

A characterization of optimistic weighted Shapley rules in minimum cost spanning tree problems

In this paper we present an axiomatic characterization of the weighted Shapley value of the optimistic TU game associated with a minimum cost spanning tree problem. This characterization is based on two monotonicity properties, population monotonicity (if a new agent joint the society nobody is worse off) and the strong cost monotonicity (if the connection cost between any pair of agents increases nobody is better off), and weighted share of extra costs (the extra costs should be divided proportionally to the weights of the agents).      

Incentive monotonicity and equilibrium selection in 2×2 matrix games

For the class of 2×2 matrix games with two strict Nash equilibria the paper introduces an equilibrium refinement called incentive monotonicity. It selects the risk-dominant equilibrium if interests are conflicting, while it remains silent in games with common interests. These results suggest that the equilibrium-selection problem might be more difficult in games with common interests, which is certainly the case if risk dominance and payoff dominance go in opposite directions.     

A fair rule in minimum cost spanning tree problems

We study minimum cost spanning tree problems and define a cost sharing rule that satisfies many more properties than other rules in the literature. Furthermore, we provide an axiomatic characterization based on monotonicity properties.     

Market depth,domestic investors and price monotonicity violations

We re-examine the monotonicity violations of option price dynamics considering the roles of market depth and domestic investors. Violations caused by option price movements in conflict with underlying price movements tend to occur less frequently as the market depth increases, especially in the case of out-of-the-money options. In contrast, violations caused by option prices that remain sticky despite underlying price changes occur more frequently as the market depth increases. Both of these relationships are amplified by domestic investors.     

Cost per remission and cost per response with infliximab,adalimumab, and golimumab for the treatment of moderately-to-severely active ulcerative colitis

Abstract

Objective:

To determine the short-term costs per sustained remission and sustained response of three tumor necrosis factor inhibitors (infliximab, adalimumab, and golimumab) in comparison to conventional therapy for the treatment of moderately-to-severely active ulcerative colitis.     

中国经济增长的特征、可持续性与潜在增长率估算:一个综述

在本文通过对中国经济增长的表现特征、可持续性和潜在增长率估算三方面的理论综述,进一步论述了中国经济增长的发展脉络,并在此基础上提出研究中国经济增长理论尚需改进的空间.     

房价水平、交通成本与产业区位分布关系再考量

中心城市房价水平或地租水平的提高具有客观性。房价水平和交通成本变动对制造业区位分布影响较大,而对于生产性服务业的影响并不显著。占用土地面积较大的制造业向外转移不仅有可能抵消房价上涨的压力,而且为具有更高附加值的生产性服务业的发展创造条件。房价水平上涨和交通成本提高加快中心城市制造业的扩散以及生产性服务业的集聚,客观上促使城市间由专业化分工向功能分工结构转变,推动中心城市实现产业升级,有利于形成合理的区域分工格局。     

国家控股、超额雇员与劳动力成本

与以往很多直接检验股权性质与公司绩效之关系的研究不同,本文选择1999—2002年健康运营的上市公司为样本,从公司雇员角度研究了控股股东的所有制性质对上市公司社会性负担的影响。经验证据表明,国家控股公司比非国家控股公司雇佣了更多的员工,并且国家控股公司的超额雇员主要源自上市初的历史遗留冗员;超额雇员和高工资率共同导致国家控股公司承担了比非国家控股公司更高的劳动力成本。此外,还发现在国家控股公司中,国资部门控股公司的超额雇员最多、劳动力成本最高;并且相对其他公司而言,该类公司上市后可能继续超额雇员。因此,推进上市公司产权多元化改革和避免国家直接控股,对改善公司治理具有积极意义。     

产权、代理成本和代理效率

本文选择政府管制较少、竞争较为充分的电子电器行业作为研究对象,考察了产权制度与代理成本和代理效率的关系,得到以下结论:(1)在代理成本上,国有产权企业普遍高于混和产权企业,混和产权企业高于个人产权企业;在代理成本差异上,混和产权企业与个人产权企业的差异小于与国有产权企业的差异。(2)长期投资率和职工人数与代理成本呈显著正相关关系,而长期投资率、财务杠杆比率、职工人数等与代理效率呈显著负相关关系。(3)企业规模越大,不同产权的代理成本差异越小;反之代理成本差异越大。(4)随着市场竞争程度的提高,各类产权企业的代理成本都呈现下降趋势,其代理效率呈现提高趋势。我们研究的启示是国有企业改革的突破口应考虑如何降低其代理成本,解决的措施之一是产权改革,尤其是产权多元化的改革,其次是完善对投资和负债及冗员的监督和控制机制,以促进代理成本的降低和代理效率的提高。     

高新技术产业投资、沉淀成本与补偿制度创新

高新技术产业投资对我国国民经济发展具有重要的作用和潜在的扩张力,但由于没有充分利用高新技术产业投资,严重影响国民经济的整体发展.为此,本文从沉淀成本角度出发,使用一个动态的投资模型,探讨高新技术产业投资所面临的障碍以及提供刺激高新技术产业投资的基本原则,在于完善投资成本补偿机制:一方面,需要大力完善市场制度;另一方面,更需要大力完善非市场制度,同时,政府折旧和税收政策等也是不可替代的.     

投资者保护、代理成本与公司绩效

本文基于一个构造的各地区2001—2004年的投资者保护指标,研究了该指标与公司绩效的关系。我们的研究发现:投资者保护水平与公司绩效正相关;国有控股上市公司的投资者保护水平与公司绩效的关系更显著。我们还发现,投资者保护水平能减弱控股股东的控制权和公司绩效的关系,降低控股股东对上市公司的资金占用,并减少上市公司对外部审计的需求。     

信任、交易成本与商业信用模式

本文研究信任这一非正式制度对企业交易成本和商业信用模式的影响。以我国各省的信任调查数据为研究基础,本文发现地区间信任差异将导致企业的签约形式显著不同,商业信用模式存在较大差异。地区间信任度越低,该地区企业的签约成本越高,具体表现为:企业较多地采用预付账款和应付票据等成本较高的商业信用模式,且相应的销售费用和折扣支出也越多。与以往文献关注法律等正式制度安排的差异不同,本文不仅验证了转轨经济环境下信任等非正式制度的重要性,同时还为"地区"与"个体"间信任的传递特征提供了经验证据,这有助于深入理解我国现阶段企业交易行为和"地区"与"个体"间的信任关系。     

信息披露、透明度与资本成本

信息披露对公司权益资本成本影响的研究对上市公司与监管机构都有着非常深刻的意义 ,然而披露水平与权益资本成本之间的联系往往并不明确 ,特别是在发展中国家。本文运用 2 0 0 2年前在上海证券交易所上市的 51 6家公司数据 ,检验了上市公司权益资本成本与其自愿披露水平的关系。在控制了公司规模与财务风险变量之后 ,本文结论显示 :上市公司信息披露水平的提高有助于降低公司的权益资本成本     

The cost of capital,asset prices,and the effects of monetary policy

The primary objective of this paper is to study the interaction between monetary policy, asset prices, and the cost of capital. In particular, we explore this issue in a setting where individuals face idiosyncratic risk. Incomplete information also provides a transactions role for money so that monetary policy can be studied. In contrast to standard monetary growth models which focus on the transmission of monetary policy to the demand for capital goods, we incorporate a separate capital goods sector so that the supply response to monetary policy is taken into account. Consequently, in contrast to the standard monetary growth model, monetary policy plays an important role in investment activity through the relative price of capital goods. Moreover, different sources of productivity can affect the degree of risk sharing. Although the optimal money growth rate falls in response to an increase in productivity in either sector of the economy, monetary policy should react more aggressively to the level of productivity in the capital sector.     

融资成本、寻租行为和企业内部资本配置

本文构造了一个两层次委托代理模型,强调了外部资本市场和内部资本市场之间的相互作用,分析表明,资本配置扭曲和资本使用效率低下的关键是外部资本市场运作不完善对企业内部管理者的寻租行为的影响。本文的分析表明,融资成本偏低的外部资本市场不仅会促使企业CEO过分扩大融资规模,而且会加剧企业内部管理者的寻租行为,导致资本配置不当、投资缺乏效率的不良后果。本文的政策含义是,必须改变融资成本偏低的现状,并加强公司治理结构建设,才能解决我国企业融资过热、资本使用效率低下等一系列问题。     

间接执法成本、间接损害与选择性执法

在法律体系已经相对完备的情况下,学者把关注的焦点放在了执法层面,并以直接执法成本解释许多法律未能得到有效执行的现象。然而现实中的执法问题,并不仅限于有法不依或执法不严,而经常是执法者在不同时期,针对不同案件有选择性地采取不同的执法强度,既有执法不严,也有过度执法、以政策替代法律的问题。本文的研究表明,这种选择性执法现象,是作为执法主体的政府面临情势变化,为降低包括间接执法成本和间接损害的总成本,运用剩余执法权以保证实现其政治、经济及社会目标的结果。     

信息披露、代理成本与公司治理

本文采用2004-2008年沪深两市A股上市公司数据,运用面板数据固定效应模型和Logistic回归模型,分项和综合考察了公司治理对信息披露质量和代理成本的影响。结果显示:信息披露质量与股权集中度、第一大股东持股比例、高管持股比例、公司控制权、公司所有权显著正相关,与股东人数显著负相关,与最终控制人属性无显著关联;代理成本与股权集中度、第一大股东持股比例、高管持股比例、公司控制权、所有权显著负相关,与股东人数、最终控制人属性无显著关联。     

运输成本、劳动力流动与制造业区域分布

近年来,中国制造业的区域发展不平衡,其中的重要影响因素是什么?本文通过构建经济地理的分析框架,分析了运输成本和劳动力流动在中国特有条件下的作用机制。运输成本差异形成了制造业在沿海地区的选址优势,而这一优势和目前的高劳动力流动成本一起,形成了沿海高成本压力而内地收入低下的新空间“二元”结构。同时,我们计算了区域经济的实际数据对这一机制进行印证,假如这一局面继续维持,它将妨碍沿海和内地产业分工与均衡发展。文章还认为,因为经济集中的趋势是内生的,所以平衡区域经济发展的政策取向应该是促进性而不是限制性的。