The extension of social security coverage in developing countries

We study the dynamic general equilibrium effects of introducing a social pension program to elderly informal sector workers in developing countries who lack formal risk sharing mechanisms against income and longevity risks. To this end, we formulate a stochastic dynamic general equilibrium model that incorporates defining features of developing countries: a large informal sector, private transfers as an informal safety net, and a non-universal social security system. We find that the extension of retirement benefits to informal sector workers results in efficiency losses due to adverse effects on capital accumulation and the allocation of resources across formal and informal sectors. Despite these losses recipients of social pensions experience welfare gains as the positive insurance effects attributed to the extension of a social insurance system dominate. The welfare gains crucially depend on the skill distribution, private intra-family transfers and the specific tax used to finance the expansion.     

LEARNING MATTERS: REAPPRAISING OBJECT ALLOCATION RULES WHEN AGENTS STRATEGICALLY INVESTIGATE

Individuals form preferences through search, interviews, discussion, and investigation. In a stylized object allocation model, we characterize the equilibrium learning strategies induced by different allocation rules and trace their welfare consequences. Our analysis reveals that top trading cycles rules dominate serial priority rules under inequality‐averse measures of social welfare.     

Optimum and Risk-Class Pricing of Annuities

When information on longevity (survival functions) is unknown early in life, individuals have an interest in insuring themselves against moving into different 'risk-classes' as their life expectancy is revealed. The First-Best allocation involves transfers across states of nature. With symmetric information, competitive equilibrium separates different risk classes and cannot provide such transfers because insurance firms are unable to precommit . When utility is invariant to risk-class realisation, the optimum entails uniform consumption and optimum retirement age independent of risk-class and an optimum social security scheme is superior to competitive equilibrium. When preferences depend on risk-class, welfare ranking of systems becomes indeterminate.     

非营利组织“三次分配”的社会福利效应——兼论政府对非营利组织的财政激励规制

本文运用基数效用原理和社会福利函数理论构建了非营利组织三次分配的可比较社会福利函数模型。通过在已有文献的基础上构建模型,比较了非营利组织三次分配与政府二次分配的社会福利效应。证明了非营利组织的三次分配能够提高社会福利水平,是政府二次分配功能的有效补充。同时利用广义矩估计的方法实证分析了非营利组织的发展在很大程度上依赖于政府的财力支持,由此政府有必要运用财政激励手段扶持非营利组织的发展。     

A simple dynastic economy with parental time investment in children’s patience

This article explores the dynamics of a general equilibrium when an individual’s rate of time preferences is endogenous in a dynastic competitive economy. We postulate that altruistic parents allocate time to make their children patient to improve their lifetime welfare. The paper shows multiplicity and instability of the competitive equilibrium. Local and global indeterminacy emerges due to complementarity between a balanced growth rate and parental time allocation. Indeterminacy implies income and growth disparity among generations. In contrast, a balanced growth path is unique and determinate in the corresponding social optimum. A unique social optimum introduces a potential policy instrument for stabilizing a cyclical competitive equilibrium.     

Is parity good? Externalities in professional sports

In professional sports there are externalities. If one team acquires too much talent then that may impact the quality of the competition negatively. This means that the league can improve social welfare by distorting the competitive equilibrium allocation. This idea has been used to explain that there should be parity among teams to improve social welfare. We develop a theoretical model based on Biner's (2009) empirical results to capture the effect of this externality on the revenue levels and wages when local fans care about winning only. Social Planner's Problem for stadium revenues implies that it is possible to increase the total revenue made in the league compared to competitive equilibrium levels by increasing big market teams' talent level, therefore less parity. In other words due to externalities competitive market allocation is too equal compared to SPP allocation. We show when local audience is mainly interested in seeing their local team dominating the visiting team and national audience only interested in watching a close game on TV, the only way in the model for it ever to be efficient to enforce parity is if we introduce a national TV market into the analysis. For the national TV market, parity is going to lead to a wider TV audience. The greater the weight on this revenue stream, the more likely it is a parity policy can increase league revenues.     

Optimal research and development and the cost of business cycles

While research and development (R&D) investment has been procyclical in the post-war period, recent literature suggests that the optimal path for R&D is countercyclical, and that the economy would be better off by subsidizing R&D in recessions. The objective of this paper is to analyze the welfare effects of distortions in the intertemporal allocation of R&D resources and to compare diverse policy interventions so as to improve social welfare. To this end, we introduce a calibrated dynamic stochastic general equilibrium model with Schumpeterian endogenous growth that is capable of explaining the observed procyclicality of R&D. Our results show that the cost of business cycles is lower in the decentralized economy with procyclical R&D than in the efficient allocation with countercyclical R&D. This is because the suboptimal propagation of shocks in the decentralized equilibrium offsets some of the existing steady-state distortions. In this second-best context, countercyclical R&D subsidies have no positive effect on welfare. In contrast, fiscal policies aimed at restoring the optimal steady-state produce large welfare gains.     

Price collusion with free entry: the parasitic competition

The market equilibrium that is generated in the presence of both price collusion and free entry is analyzed taking under consideration the case of a homogeneous product and the case of differentiated products. The outcomes of this market regime are compared with those of other regimes, including competition (or monopolistic competition), monopoly, fixed price with collusive entry limitation. Some welfare implications of the market regime of price collusion with free entry are examined, with respect to the maximum social welfare allocation and the allocations of other market regimes, so to highlight the inefficiency of price collusion with free entry. The number of producers results to be the maximum number of firms that can produce without incurring into losses. Therefore, social distress is caused by a displacement from the price collusion equilibrium with free entry. Its defence can thus be considered in reference to the desirability of social goals that are in contradiction with economic efficiency.     

Fundamentals, information, and international capital flows: A welfare analysis

In the recent discussion surrounding the design of a new international financial architecture, enhancing transparency has widely been proposed as a policy essential for increasing the efficiency of international capital markets. This paper uses a simple two-country (two-agent) general equilibrium model with incomplete markets and production to explore the welfare consequences of an increase in public information about country-specific fundamentals (increase in transparency). An improvement in the quality of information has two effects on the ex ante welfare of individual countries: A direct effect that increases the efficiency of global capital allocation and welfare, and an indirect general equilibrium effect that increases asset price volatility and may decrease welfare. When the degree of risk-aversion is low, at least one country will gain from an increase in information quality. If the degree of risk-aversion is high, then there are robust examples of economies for which an increase in information hurts all countries. The paper also discusses how certain institutional arrangements (international derivative markets, international agency) could ensure that all countries gain from better information by providing insurance against information-induced asset price risk.     

On the Efficiency of Decentralized Exchange with Resale Possibilities

This paper studies decentralized exchange by bilateral matching and bargaining when resale is possible. Decentralized exchange involves the risk that goods and services may be allocated inefficiently; if low-valuation buyers consume while high-valuation buyers do not, then social welfare is reduced. If resale is possible and transaction costs are negligible, we would nevertheless expect an efficient allocation to result from decentralized exchange. This paper suggests that this depends on the nature of the commodity; while the allocation of a durable good will be efficient, the allocation of a "consumable" good need not.     

The Economic Efficiency of Policy Reform and Partial Market Liberalization under Transaction Costs

The article presents an integrated analysis of the effects of domestic and trade policy reform on resource allocation and welfare under transaction costs. It develops a general multiagent, multicommodity model, where transaction costs are the costs of resources used in the exchange process. The influence of domestic and trade policy (including both price and quantity instruments) on distorted market equilibrium is analysed. Alternative concepts of distorted equilibrium are presented and investigated. They provide a basis for evaluating the effects of multilateral partial market liberalization on resource allocation and welfare under transaction costs. New conditions are derived under which multilateral policy reforms generate Pareto improvements.     

Lotteries, Sunspots, and Incentive Constraints

We study a prototypical class of exchange economies with private information and indivisibilities. We establish an equivalence between lottery equilibria and sunspot equilibria and show that the welfare and existence theorems hold. To establish these results, we introduce the concept of the stand-in consumer economy, which is a standard, convex, finite consumer, finite good, pure exchange economy. With decreasing absolute risk aversion and no indivisibilities, we prove that no lotteries are actually used in equilibrium. We provide a simple numerical example with increasing absolute risk aversion in which lotteries are necessarily used in equilibrium. We also show how the equilibrium allocation in this example can be implemented in a sunspot equilibrium. Journal of Economic Literature Classification Numbers: D11, D50, D82.     

On the second optimality theorem of welfare economics

To what extent does the second optimality theorem of welfare economics (every Pareto optimal allocation can be repesented as a Walras equilibrium allocation) remain valid when preferences are allowed to be locally satiated? It is always valid for an exchange economy, and is valid for a production economy if there is a consumer who is not locally satiated, but not in general for a production economy where all consumers are locally satiated. A generalized equilibrium is defined, which includes the Walras equilibrium as a special case. Every Pareto optimum can be represented as a generalized equilibrium allocation. Furthermore, every Pareto optimal utility distribution can be realized by a Walras equilibrium allocation.     

Distortions in oil contract allocation and environmental damage in the presence of corruption

This article investigates how distortions in oil contract allocation can alter a government official’s decisions and shows that corruption enlarges the parameter space over which multinational oil companies win the contract against the smaller companies. It is found that corruption superficially creates an equilibrium outcome that looks efficient even when it is not, and diminishes the official’s concern for environmental damage by weighing damage to the public less and oil revenues more. Sensitivity analyses show that for all levels of environmental damage and corruptibility, multinational oil companies always win the contract. An important policy implication is that corruption distorts optimal decisions and causes oil contract allocation decisions to be based primarily on monetary benefit than social welfare.     

Fiscal policy as a temptation control device: Savings subsidy and social security

In an environment where individuals suffer from temptation and self-control problems, there are induced preferences for commitment devices. We show that the savings subsidy and social security programs can be properly designed to mitigate the adverse effect of succumbing to temptation and release severity of self-control. Moreover, we disentangle the mechanics behind the two fiscal programs and find that the driving forces are quite different. Welfare gains associated with a social security program result mainly from releasing self-control costs. Conversely, welfare gains associated with a savings subsidy program are mainly driven by mitigating inter-temporal allocation distortions. Interestingly, the direction and size of welfare effects vary substantially when general equilibrium channels are in play. Our results have implications for designing an effective temptation control device using fiscal policy.     

Leadership and Privatisation in a Mixed Multi‐product Oligopoly: An Endogenous Timing Model

This paper examines both leadership choice and welfare consequences of privatisation in an endogenous timing mixed multi‐product oligopoly. It shows that a multi‐product firm undermines the welfare‐maximising efforts of a public firm by cross‐subsidising. The paper demonstrates that a unique subgame perfect Nash equilibrium emerges in a multi‐product market, in contrast to the multiple equilibria of a single‐product market. This unique equilibrium indicates that profit‐maximising private firms retain leadership while a welfare‐maximising public firm acts as a follower. Even on the off‐equilibrium path where the public firm acts as a leader, it rarely generates maximum social welfare. However, privatising the public firm usually harms social welfare and results in a different timing structure in equilibrium.     

Discounting and welfare evaluation of policies

We start with the premise that if policy discounting is to have any welfare relevance, one has to accept it being a derivative of a social welfare function (SWF). We show that if that derivative is to have a net present value (NPV) form, then the baseline allocation must be stationary. In addition, we show that at a stationary baseline in an overlapping generations growth economy, the intergenerationally fair discount rate equals the growth rate of per‐capita consumption, which is, roughly, 2% for the United States. This differs from the interest rate, even in the golden rule equilibrium, unless population growth is null. The last result is based on the main theorem in Mertens and Rubinchik (2012) and is demonstrated for a policy space that might naturally arise in applications.     

On the fair division of greenhouse gas abatement cost

This paper introduces a solution for the fair division of emission reduction costs in the climate change regime. Our primary focus is on the fair division of efficiency gains that arise from exchanging the initial allocation of emission entitlements, rather than the initial allocation itself. We propose to complement the competitive Walrasian solution with welfare bounds, the ethical justification of which rests on commonality of ownership. Simulations with an intertemporal computable general equilibrium model illustrate the relevance of such welfare bounds. For a wide range of initial allocations of emission entitlements – including an equal per capita allocation – we find that developing countries should be fully compensated for their emission abatement efforts, but should not receive any further transfers.     

Dynamic analysis of patent policy in an endogenous growth model

In this paper, we explore the dynamic properties of an endogenous growth model with finite patent length. We show that there exists a unique equilibrium growth path and that this path exhibits damped oscillations in contrast to the equilibrium path of an endogenous growth model with infinite patent length. We also examine the effects of patent policy on social welfare and show that infinite patent length does not maximize social welfare. Furthermore, we show that, in a growth model that does not exhibit scale effects, a finite patent length maximizes social welfare on the balanced growth path.     

Controlling Illegal Immigration: Border Control vs. Domestic Enforcement

This paper presents a two-country general equilibrium model where international mobility of labor is prohibited. Illegal immigration nevertheless occurs. The probability of success at illegal immigration depends on resources allocated to border control and domestic enforcements. We examine the effects of switching resources form border control to domestic enforcement on illegal immigration and on welfare levels. We characterize the allocation of resources between the two methods of immigration control, that minimizes illegal immigration, and find that, starting from this allocation, moving resources from border control to domestic enforcement is unambiguously welfare improving for the destination country.