Severance Payments and Unemployment Insurance: A Commitment Issue

In the event of a job termination, many workers receive severance payments from their employer, in addition to publicly provided unemployment insurance (UI). In the absence of a third party enforcer, contracts featuring severance payments must be supported by an implicit self‐enforcing contract. Workers believe employers will make severance payments only if it is in their best interest ex post. If firms discount the future deeply, they will reduce the severance payment they offer, in order to relax their incentive constraint. Workers are forced to bear risk, and too many workers are laid off. We show that a well‐designed public UI system can correct these distortions.     

Subsidies versus Public Provision of Private Goods as Instruments for Redistribution

The literatures on differential commodity taxes and on quantity controls to supplement income taxation have developed separately. This paper combines these two strands in the standard framework of optimal non-linear income taxation. We use a model with two types of households where the government has access to both subsidy policy and public provision of a good substitutable for leisure, and ouseholds can supplement the publicity provided good from the market. We present conditions under which policy should involve one or both of these two instruments alongside income taxation. The model is extended to many ability types.     

Public Versus Private Provision of Public Goods

It is well known that public goods are underprovided in a static setting with voluntary contributions. Public provision—in a median voter framework with proportional taxation—generally exceeds private provision. This paper compares private and public provision of public goods in a dynamic setting. In a dynamic setting, voluntary donations can result in efficient provision. Also, majority‐rule solutions exist even when taxes are not proportional to income. At low discount factors, public provision tends to exceed private provision. As patience increases, however, private provision may exceed public provision. This occurs because many outcomes with a low level of public good provision—and potentially large targeted transfer payments to particular individuals—become sustainable under public provision. Under private provision, however, large targeted transfers are unsustainable. To finance the public good, private provision tends to result in benefit taxation, and public provision tends to result in progressive taxation.     

Social Insurance with In-kind Provision of Private Goods

This paper addresses the desirability of providing in-kind transfers as a screening device to facilitate redistribution of income from able to disabled persons within a social insurance system. An optimal policy—consisting of cash transfers, income-contingent in-kind transfers of one good particularly demanded by disabled workers, and linear taxation of other commodities—is characterized. It is then asked whether and, if so, when this policy can be replaced by an "earning-tested scheme" that provides the in-kind good only to those indivi duals who have no earnings from labor or by a non-linear pricing policy.     

Social Norms and Private Provision of Public Goods

The formation of social norms for voluntary contributions to a public good is analyzed in a game in which people have preferences for private consumption, a public good, and social approval. Each person chooses to be one of the two types: a contributor or a non‐contributor. Thereafter, each person meets people who can observe his type. A non‐contributor feels disapproval, whereas a contributor feels approval if he believes that a contributor observes his type. The game has two asymptotically stable states: one in which everybody is a contributor, and one in which nobody is a contributor. Governmental subsidization of the public good can move the society to the former state, whereas a governmental contribution to the public good can move the society to the latter. Indeed, this crowding in or crowding out prevails even after policy reversal.     

Informal Insurance Arrangements with Limited Commitment: Theory and Evidence from Village Economies

Recent work on consumption allocations in village economies finds that idiosyncratic variation in consumption is systematically related to idiosyncratic variation in income, thus rejecting the hypothesis of full risk-pooling. We attempt to explain these observations by adding limited commitment as an impediment to risk-pooling. We provide a general dynamic model and completely characterise efficient informal insurance arrangements constrained by limited commitment, and test the model using data from three Indian villages. We find that the model can fully explain the dynamic response of consumption to income, but that it fails to explain the distribution of consumption across households.     

中国社会医疗保险道德风险刍议

中国社会医疗保险是由国家立法实行的一种非盈利性社会事业,关系到人们的生活健康、人力资源的保护增值与社会经济的有序发展,其要义不言而喻。然而,由于现行的医疗保险体制运行中的种种缺陷而引致的医保欺诈现象愈演愈烈,不仅给国家财政带来巨大负担,还给整个社会带来严重的信用危机。因此,医保道德风险的防范与控制已经刻不容缓。     

Factor Endowments and the Private Provision of Public Goods

The paper examines the consequences of increasing the size of the community in the standard model of the private provision of public goods when costs are variable. In contrast to an economy with fixed costs, the provision of the public good can fall with a larger community, and an increased provision of the public good is neither a necessary nor a sufficient condition for individual utility to rise. The paper also contributes to the literature on immiserizing growth in that it shows that capital accumulation can possibly result in lower utility for all individuals.     

Repeated Interaction and the Public Provision of Private Goods

The literature suggests that governments can use in-kind transfers to design efficient and targeted redistribution schemes if individual incomes are not directly observable. We investigate the extent to which the self-selection property of in-kind transfers carries through if redistributive transfers are made repeatedly. In a two-period setting, the government may gain information about the individuals' incomes in the first period and exploit this information for making targeted transfers in the second-period. This, however, also triggers changes in the individuals' behavior. If the government can commit to its future policy, the least cost policy may involve randomization between cash and in-kind transfers. Without commitment, the dynamic setting works against the government's interest. It may no longer be able to use in-kind transfers to generate information about the individuals' types.
JEL classification : H 42; H 2     

有效需求、道德风险:农业产业化和政策性农业保险

农业产业化与政策性农业保险存在着互动机制,农业产业化对政策性农业保险的促进机制则是本文研究的重点.农业产业化通过强化农户的风险意识和提高农户的支付能力来增加政策性农业保险的有效需求;同时,通过提高农户的组织化程度和加强农户的合作机制来降低政策性农业保险的道德风险.     

商业医疗保险中的道德风险防范与控制

道德风险在各种保险市场都存在,但在医疗保险市场却复杂得多。道德风险使医疗费用快速不合理地增长,过度消耗有限资源,给社会造成了极大的浪费,同时还恶化了医患关系,降低了社会诚信水平。分析了我公司9 876例案件中出现的道德风险及采取的防范措施。     

公共品私人自愿提供决策的实验研究

本文利用实验数据对公共品私人自愿提供机制的多个经典特征事实进行了实证检验,其结论基本支持诸如"公共品私人自愿供给的存在性"、"捐献率随重复捐献次数的增加而有下降的趋势"和"公共品投资的私人边际回报率和交流的正效应"等特征事实.同时,实验还得到了一些新的发现,如"期初平均捐献水平较低"、"口头协议效果显著"、"经验分享存在积极作用"和"小组的合作程度存在巨大的差异"等.这些结论说明通过合理的制度设计和安排可以达到部分公共品由私人自愿提供的目的.     

控制权收益、道德风险与软预算约束

Dewatripont-Maskin(1995)将软预算约束描述为一种事前无效,事后有效的动态激励问题,认为信贷的分散化有助于消除软预算约束。文章在DM(1995)模型基础上引入控制权收益变量,论证了事前无效,事后也无效软预算约束的存在条件,指出这种软预算约束本质上是控制权人追求私人收益的道德风险行为。信贷的分散化不足以消除事后无效率的软预算约束。完善的公司治理机制和法律机制是减少事后无效率软预算约束的有效途径。     

Income Distribution, Taxation, and the Private Provision of Public Goods

This article investigates the role of taxation when public goods are privately provided. Externalities between consumers via the public good are shown to cause kinks in social indifference curves. As a result, a government restricted to income taxation should engineer enough inequality to ensure there are some non-contributors to the public good. Whether commodity taxation changes this conclusion depends on the extent to which consumers "see through" the government budget constraint. If they can, inequality should still be sought. When they cannot, in contrast to the case of an economy with only private goods, commodity taxation can be used in conjunction with income transfers to achieve the first-best.     

On the Private Provision of Intertemporal Public Goods with Stock Effects

The provision of public goods is often hindered by a lack of powerful institutions that can sanction free riders or otherwise enforce private contributions to the public good. The simple deposit based solution introduced by Gerber and Wichardt (J Public Econ 93:429–439, 2009) solves this problem, but may require prohibitively large deposits, in particular in the context of intertemporal public goods. In this paper, we propose a modification of the deposit solution that relies only on comparably small deposits. The proposed modification improves the applicability of the procedure, most notably as it also allows to reduce deposits in static public goods problem by transforming them into dynamic ones with small per period contributions.     

失业保险金与再就业行为

现有的失业理论及实证研究都认为失业保险金的提高会增加失业者的失业持续时间。在本文中，我们试图从失业者面临工作机会的工资分布结构出发，对失业保险金与失业者再就业工资分布的关系进行描述。通过对传统工作搜寻理论模型的扩展，我们证明失业保险金对失业持续时间的影响存在三种不同的传导路径，同时我们得到两个推论：失业保险金的增加一方面将提高失业者接受“高”工资工作机会的概率；但另一方面对失业者从事“低”工资工作机会的影响是不确定的。如果将正武工作视为“高”工资的工作机会，而将非正式工作视为“低”工资的工作机会；则基于微观层面的数据所进行的实证研究结果验证了我们的推论。     

A Revelation Mechanism for Soft Information under Moral Hazard

This paper constructs a revelation mechanism to address a problem of moral hazard under soft information. The agent alone observes the stochastic outcome of her action, which she reports to the principal. Therefore the principal also faces a problem of ex post adverse selection. Economically relevant restrictions induce constraints on the principal's choice of mechanism and the Revelation Principle fails to apply. Specifically, a direct mechanism induces some pooling, which does not replicate the allocation obtained using a larger message space. Pooling also weakens the ex ante incentives. The Revelation Principle is extended to obtain type separation. A better audit relaxes frictions.     

Strategic Complementarity in the Dynamic Private Provision of a Discrete Public Good

Individual voluntary contributions to a discrete public good are shown to be strategic complements in a dynamic private provision game. This is in contrast to a public good that can take on any value in a continuum where they are strategic substitutes.