Internalizing externalities of loss prevention through insurance monopoly: an analysis of interdependent risks

When risks are interdependent, an agent’s decision to self-protect affects the loss probabilities faced by others. Due to these externalities, economic agents invest too little in prevention relative to the socially efficient level by ignoring marginal external costs or benefits conferred on others. This paper analyzes an insurance market with externalities of loss prevention. It is shown in a model with heterogenous agents and imperfect information that a monopolistic insurer can achieve the social optimum by engaging in premium discrimination. An insurance monopoly reduces not only costs of risk selection, but may also play an important social role in loss prevention.

论公共卫生最优支出策略

公共卫生支出具有极强的正外部性.如果由地方政府或私人选择公共卫生支出的水平,那么他们的最优选择是较低的公共卫生支出和较高的个人消费(内含个人医疗支出),整个社会的福利将会处于较低的水平状态.本文在一个动态的框架下分析了发生这种现象的经济学原因,说明中央政府而非地方政府或私人应该对公共卫生的建设承担更大的责任,应由中央政府负责全国公共卫生体系的建设.     

Margin regulation and volatility

An infinite-horizon asset-pricing model with heterogeneous agents and collateral constraints can explain why adjustments in stock market margins under US Regulation T had an economically insignificant impact on market volatility. In the model, raising the margin requirement for one asset class may barely affect its volatility if investors have access to another, unregulated class of collateralizable assets. Through spillovers, however, the volatility of the other asset class may substantially decrease. A very strong dampening effect on all assets׳ return volatilities can be achieved by a countercyclical regulation of all markets.     

EFA Keynote Speech: “Corporate Governance and Corporate Social Responsibility: What Do Investors Care about? What Should Investors Care about?”

This article is the keynote address from the Eastern Finance Association meeting in New Orleans in March 2007 with updated references and examples. In this keynote address, I discuss what we can learn about institutional investors' views on corporate governance and corporate social responsibility from research and surveys.     

Asset pricing with heterogeneous preferences,beliefs, and portfolio constraints

Portfolio constraints are widespread and have significant effects on asset prices. This paper studies the effects of constraints in a dynamic economy populated by investors with different risk aversions and beliefs about the rate of economic growth. The paper provides a comparison of various constraints and conditions under which these constraints help match certain empirical facts about asset prices. Under these conditions, borrowing and short-sale constraints decrease stock return volatilities, whereas limited stock market participation constraints amplify them. Moreover, borrowing constraints generate spikes in interest rates and volatilities and have stronger effects on asset prices than short-sale constraints.     

机构投资者担心企业应用衍生品进行投机吗-来自中国上市公司的证据

以2007-2011年应用过衍生品的中国上市公司为样本,检验机构投资者持股与企业应用衍生品及其投机行为的关系,研究发现:机构投资者担心企业应用衍生品尤其是应用衍生品的投机行为会损害其自身的利益,并且这种担心超出了机构投资者通过积极的监督来保障自身利益的意愿,因此,机构投资者倾向于减少对那些应用衍生品公司的投资,大多维持在一个较低的水平.此外,证据还表明:在我国上市公司中,机构投资者的投资并不普遍,份量也较轻;衍生品在我国上市公司中的应用亦不普遍并且应用的程度很低,大多数应用衍生品的公司是为了套保,但一旦投机则非常严重;机构投资者较为看重应用衍生品公司的成长性,而反感其业绩与盈余管理行为.     

Do institutional investors drive corporate social responsibility? International evidence

This paper assesses whether shareholders drive the environmental and social (E&S) performance of firms worldwide. Across 41 countries, institutional ownership is positively associated with E&S performance with additional tests suggesting this relation is causal. Institutions are motivated by both financial and social returns. Investors increase firms’ E&S performance following shocks that reveal financial benefits to E&S improvements. In cross section, investors increase firms’ E&S performance when they come from countries with a strong community belief in the importance of E&S issues, but not otherwise. As such, these institutional investors transplant their social norms regarding E&S issues around the world.     

Capital market equilibrium without riskless assets: heterogeneous expectations

The existence theorem of Allingham (Econometrica 59:1169–1174, 1991) for the capital asset pricing model (CAPM) is generalized to the case where agents have heterogeneous expectations on the return distribution and the mean-variance utility functions are quasiconcave. This result is built upon new conditions which are distinct from and weaker than the conditions imposed on the CAPM in the literature.      

垄断对市场价格及社会公平的影响研究

通过分析垄断收入差距的形成及其对不同消费者福利和社会公平分配的影响,以及初次分配中垄断差距导致的异质需求及其经济后果表明:垄断工资及垄断利润分享导致了垄断的收入分配效应;当收入差距扩大形成了异质需求过后,资产的市场价格上升,诱致价格泡沫和投机行为,并进一步损害中低收入消费者的福利,恶化社会公平分配.     

A computational study on general equilibrium pricing of derivative securities

This paper analyses the accuracy of replicating portfolio methods in predicting asset prices. In a two-period, general equilibrium model with incomplete financial markets and heterogeneous agents, a computational study is conducted under various distributional assumptions. The focus is on the price of a call option on an underlying risky asset. There is evidence that the value of the (approximate) replicating portfolio is a good approximation for the general equilibrium price for CRRA preferences, but not for CARA preferences. Furthermore, there is strong evidence that the introduction of the call option reduces market incompleteness, but that the price of the underlying asset is unchanged. There is, however, inconclusive evidence on the welfare effects of the option. The author thanks Dolf Talman, Andrew Somerville, an anonymous referee, and an Associate Editor for helpful comments. Research funding from the Irish Research Council for the Humanities and Social Sciences is gratefully acknowledged.     

Credit frictions and the comovement between durable and non-durable consumption

Frictions in lending between households have been proposed as a solution to the difficulties new-Keynesian models have in predicting a decline in both durable and non-durable consumption following a monetary tightening. By revisiting a standard new-Keynesian framework with collateral constraints, it is shown that the presence of such credit frictions in fact makes it more difficult to generate the joint decline. The intuitive reasons behind this result are provided, which should be helpful in developing models that are more successful in generating a positive comovement between durables and non-durables.     

Monetary aggregates and the business cycle

A monetary aggregate consisting predominantly of zero-maturity deposits, called MZM, tends to systematically lead output in the US business cycle. Such fluctuations are observed both before and after the 1979 monetary policy change. Similar dynamics are obtained in a model with multi-stage production and purchase-size heterogeneity when agents optimally choose their mix of cash, checkable, and time deposits used in transactions. The causality in the model runs from real activity to money, rather than the other way around. Although the monetary base is endogenous, through a Taylor-type rule, the lead in MZM is primarily driven by deposit creation.     

中国情境下社会责任消费行为量表研究

在发达国家,社会责任消费已成为一个热点话题,我国学者也纷纷倡导消费者履行社会责任.为了发现在我国情境下消费者社会责任的维度是否与西方研究有所不同,本文采用Webb2010年开发的社会责任消费行为量表,测量与评价我国消费者社会责任行为的因子结构,并检验其信效度.结果表明,我国消费者的负责任行为可分为六个维度,即支持企业善因营销、支持履行高级社会责任的企业行为、惩罚不负基本责任的企业行为、购买习惯环保、回收再用和生活习惯低碳.     

Corporate social responsibility and financial performance: the “virtuous circle” revisited

We examine the causal relation between corporate social responsibility (CSR) and financial performance. Consistent with past studies, we find that the two variables appear to be related when we use traditional statistical techniques. However, using a time series fixed effects approach, we find that the relation between CSR and financial performance is much weaker than previously thought. We also find little evidence of causality between financial performance and narrower measures of social performance that focus on stakeholder management. Our results suggest that strong stock market performance leads to greater firm investment in aspects of CSR devoted to employee relations, but that CSR activities do not affect financial performance. We conclude that CSR is driven more by unobservable firm characteristics than by financial performance.

Corporate social responsibility and social capital

When corporations make an effort to be socially responsible beyond what is required by the law, this effort is often described as strategic—made mainly for the shareholders’ or managers’ benefit. A large body of literature corroborates this belief. But, could the incentives for corporate social responsibility (CSR) come from an altruistic inclination fostered by the social capital of the region in which the firm is headquartered? We investigate whether this phenomenon exists by examining the association between the social capital in the region and the firm’s CSR. We find that a firm from a high social capital region exhibits higher CSR. This result suggests that the self-interest of shareholders or mangers does not explain all of the firm’s CSR, but the altruistic inclination from the region might also play a role.     

湖南水污染税的税制设计及征收效应的一般均衡分析

湖南省\"两型社会\"的深化建设、首批环境税的开征试点、湘江污染的重点治理等事件将湖南省水污染税改革推向了历史的舞台。借鉴国外水污染税开征经验,文章系统地设计了湖南省水污染税征收的基本框架,运用可计算一般均衡(CGE)模型模拟征收水污染税对宏观经济、产业结构、污染物减排等产生的影响。结果表明:开征水污染税宏观经济受损的长期影响要大于短期;对绝大部分行业都带来了不同程度的负面影响,其中短期合成材料制造业产出下降最大,而长期毛纺织和染整精加工业受损最大;然而征收水污染税减少重金属等污染物排放,氨氮、化学需氧量下降尤为显著。     

The institutionalisation of corporate social responsibility reporting

This study examines corporate social responsibility reporting (CSRR) structures through a comparison of the disclosures in two countries with different social issues. The analysis is guided by a focus on the legitimisation offered by isomorphism. We compare the 2007 annual report and website (including standalone report) CSRR of a matched sample of 18 Australian and 18 South African mining companies. Among the 30 comparisons of disclosure patterns, 29 show no difference. We also provide examples of specific disclosures that show a remarkable level of similarity in CSRR and in the CSRR management structures adopted in the two countries. Our findings show similar overall patterns of CSRR in diverse settings, while differences in CSRR content at a more detailed level remain. For example, companies refer to the applicable national regulations and rules; as well as to their specific local communities. These findings provide evidence that the same reporting templates are used in CSRR globally. There is evidence to suggest that CSRR is institutionalised through professionalization and other means, suggesting a need to interpret CSRR characteristics and patterns as a reflection of global CSRR templates. Management intent or company-specific characteristics, such as social and environmental performance, do not necessarily drive CSRR patterns.