不完全市场下的期权定价理论综述

由于B-S定价公式是在完全市场条件假设下推导出来的,这与现实存在很大的出路,因此后来的学者就针对市场条件状况,研究了不同市场条件下的期权定价,其中以不完全市场条件下的期权定价为主,这显然与事实更加吻合。不完全市场主要可以分为带交易费用的期权市场、存有违约风险的期权市场以及信息不完全的期权市场。文章在此基础上,分析总结了在这个市场假设条件下的研究现状,并给出了未来值得深入研究的方向:主要是进一步放松B-S定价模型的假设条件,引入更多的现实因素,深入研究不同市场状况下的期权定价问题。     

Who should sell stocks?

Never selling stocks is optimal for investors with a long horizon and a realistic range of preference and market parameters, if relative risk aversion, investment opportunities, proportional transaction costs, and dividend yields are constant. Such investors should buy stocks when their portfolio weight is too low and otherwise hold them, letting dividends rebalance to cash over time rather than selling. With capital gains taxes, this policy outperforms both static buy‐and‐hold and dynamic rebalancing strategies that account for transaction costs. Selling stocks becomes optimal if either their target weight is low or intermediate consumption is substantial.     

林权流转价格及其影响因素分析

以林农拥有的活立木为研究对象,利用2007—2017年浙江省1546宗活立木流转样本,采用多元线性回归实证分析了是否在林权交易中心交易对活立木流转价格存在影响。结果表明:关键解释变量是否在林权交易中心进行交易对活立木流转价格具有显著的正向影响;流转面积、单位面积蓄积、区域虚拟变量、坡度等对流转价格都产生一定程度的影响;流转期限对流转价格的影响不大。因此,需要加强对林权交易中心的宣传,降低相关的交易成本,从而吸引更多的小规模林农参与交易。     

Environmental taxes,reforms and economic growth: an empirical analysis of panel data

This paper explores the relationship between environmentally related taxes and the economic growth rate. The analysis also investigates whether this relationship differs between countries that have implemented environmental tax reforms (ETRs) and those that have not. Using panel data from 31 OECD countries over the period 1994–2013, the paper finds that when we allow environmentally related tax revenues to interact with an initial level of real GDP per capita, the overall revenues of these taxes are negatively associated with the economic growth rate in the short and long term. Furthermore, we show that the higher the initial level of GDP per capita, the more environmentally related tax revenues can promote the economic growth rate. The analysis also reveals that the relationship between environmentally related tax revenues and economic growth varies between countries that have a mechanism to redistribute environmentally related tax revenues and those that do not.     

行政审批改革与制度性交易成本——基于效率评价的视角

制度性交易成本是经济主体为遵守制度规定而产生的非生产性成本,行政审批改革通过提高经营效率、节约时间成本、降低资金成本和促进行业竞争四种途径降低制度性交易成本。本文通过对我国地市级面板数据的实证分析后发现,行政审批改革可以有效降低地区制度性交易成本;当行政审批改革发生在营商环境相对较差的中西部城市、距离省会城市较近的城市以及当城市获得法律支撑时,能够更显著地降低当地制度性交易成本。本文据此提出如下政策建议:深化行政审批改革,减少不必要的审批事项;健全改革激励机制,确保政策的贯彻与落实;通过机构设置、法律规定、权责划分等进行配套措施改革。     

Subprime governance: Agency costs in vertically integrated banks and the 2008 mortgage crisis

Research summary: This study uses the 2008 mortgage crisis to demonstrate how the relationship between vertical integration and performance crucially depends on corporate governance. Prior research has argued that the vertical integration of mortgage origination and securitization aligned divisional incentives and improved lending quality. We show that vertical integration improved loan performance only in those firms with strong corporate governance and that this performance‐integration relationship strongly decreases and actually reverses as governance quality decreases. We interpret these findings as suggesting that the additional control afforded by vertical integration can, in the hands of poorly monitored managers, offset gains from aligned divisional incentives. These findings support the view that corporate governance influences the strategic outcomes of a firm, in our case, by influencing the effectiveness of boundary decisions. Managerial summary: One of the unanswered questions of the 2008 mortgage crisis is why some firms produced toxic mortgages and others did not. Many have argued that vertically integrated banks—banks that both originated and securitized mortgages—had incentives to monitor themselves and thereby avoid overaggressive lending and outright fraud. Yet many of the worst lenders, such as Washington Mutual and New Century Financial, were in fact integrated. This study shows that the behavior of these firms critically depended on their corporate governance. We find that poorly monitored executives used their additional control over the integrated businesses to issue low quality loans that supported short‐term growth. Our results suggest that governance is a crucial prerequisite for financial services, particularly for firms whose managers control multiple, interrelated businesses. Copyright © 2015 John Wiley & Sons, Ltd.     

论多元化战略与资本结构

从战略视角思考资本结构问题,不仅可以解释不同国家间企业资本结构的“空间”差异,还可以解释同一国家不同历史时期企业资本结构的“时间”差异。从内部资本市场效应、代理成本效应、交易成本效应和多市场联系效应等四个角度分析多元战略对资本结构的影响,并探讨企业在资本结构决策中如何考虑多元化战略因素。     

人才租赁三方模式对雇佣关系的影响

本文分析了人才租赁条件下雇佣关系由传统的两方模式向三方模式的转变 ,并从交易成本的角度说明雇佣关系三方模式下短期雇佣的合理性。由于现实对短期用工的需求越来越强 ,人才租赁的出现不但降低了交易成本 ,而且对用人企业和求职者都有好处。     

从一个简单博弈探讨中小企业信用体系建设

市场经济是信用经济,诚信是市场经济机制的第一法则。信用缺失已成为我国中小企业面临的一个严重问题,其结果不仅使社会交易成本不断提高,而且在很大程度上抑制了中小企业的健康发展。采用博弈论的分析方法,在信用博弈模型分析的基础上,对中小企业信用缺失的成因进行分析,并提出中小企业信用体系建设的思路。     

信用效应认识的深化与信用秩序的恢复和增强

市场经济从本质上讲是信用经济.在市场经济条件下,信用是最基本的社会经济关系,是整个社会经济得以维系和发展的基础.随着中国经济改革的逐步深入,特别是在加入WTO后,信用的作用逐步显现出来.但是,人们对信用效应的认识还有待深化,尤其是对信用关系紊乱可能带来的负面作用认识得不多,而对信用的积极作用往往习惯于借鉴美欧现成的信用模式.本文从深化对信用效应的认识入手,分析了信用秩序混乱的形成原因,并在简要评价我国信用基本状况的基础上,提出了恢复和增强我国信用秩序的建议.