Eytan Sheshinski

Optimal Redistributive Taxation When Individual Welfare Depends upon Relative Income

I. Introduction, 589. — II. An optimal negative income tax model, 591. — III. The maximin criterion, 594. — IV. A utilitarian social objective, 597. — V. Conclusion, 598. Our theory … depends upon the validity of a single hypothesis, viz.: that the utility index is a function of relative rather than absolute consumption expenditure. — J. Duesenberry Income, Saving and the Theory of Consumer Behavior

Resilience in natural and socioeconomic systems

We, as a society, find ourselves confronted with a spectrum of potentially catastrophic and irreversible environmental problems, for which conventional approaches will not suffice in providing solutions. These problems are characterized, above all, by their unpredictability. This means that surprise is to be expected, and that sudden qualitative shifts in dynamics present serious problems for management. In general, it is difficult to detect strong signals of change early enough to motivate effective solutions, or even to develop scientific consensus on a time scale rapid enough to allow effective solution. Furthermore, such signals, even when detected, are likely to be displaced in space or sector from the source, so that the motivation for action is small. Conventional market mechanisms thus will be inadequate to address these challenges.

Optimal Tax Treatment of the Family: Married Couples

This paper examines the appropriate tax treatment of the family in a series of analytical models and numerical examples. For a population of taxpaying couples which differ in earning capacity, we derive the optimal tax rates for each potential earner. These rates depend crucially upon own and cross labor supply elasticities and the joint distribution of wage rates. Our results suggest that the current system of income splitting in the United States, under which husbands and wives face equal marginal tax rates, is non-optimal. Using results from recent econometric studies, and allowing for a sensitivity analysis, the optimal tax rates on secondary workers in the family are much lower than those on primary earners. Indeed, our best estimate is that the secondary earner would face tax rates only one-half as high as primary earners.

Externalities and compulsary vaccinations

Abstract This paper challenges the conventional wisdom that, because of the free rider problem, a case can be made for compulsary vaccination against infectious disease. For a very general class of models, requiring that all individuals be vaccinated is strictly dominated by free choice. The market allocation is not optimum and in the full information optimum some individuals would be compelled to be vaccinated. This allocation can be achieved by taxes and subsidies; however, the government can exploit the revelation properties of vaccination and achieve an even better allocation than the full information optimum.

A Model of Social Security and Retirement Decisions

The purpose of the present paper is to focus on the potential inducement to retire earlier in the presence of social security and on the implied effects on lifetime savings. This problem is analyzed within the framework of a model of intertemporal utility maximization. The organization of this work is as follows. Section 1 introduces the topic. Section 2 presents the model of individual optimization and of the market equilibrium. Sections 3 through 5 present the comparative statistics analysis. Section 3 evaluates the effects on the equilibrium retirement age, section 4 modifies the benefits formula to depend on retirement age and section 5 examines the wealth-income ratio effect. Section 6 introduces the intergenerational transfer problem. Section 7 presents the general model underlying the previous sections.

Economic Aspects of Optimal Disability Benefits

This paper analyzes optimal disability and retirement (or welfare) benefits with imperfect disability evaluation (with some able workers judged disabled and some disabled workers judged able). Thus the levels of both disability and retirement benefits affect labor supply. With anyone not working eligible for retirement benefits, we analyze the optimal structure of benefits for a given disability screening mechanism and briefly consider the problem of optimal evaluations of disability evidence. In the United States, there is an overlap in eligibility for disability and retirement portions of Social Security. More generally, welfare is sometimes available to people denied disability benefits.

Uncertainty and Optimal Social Security Systems

This paper examines the annuity aspect of social security within the framework of an overlapping-generations model. The duration of life is assumed to be uncertain. Under a fully funded system, demand for social security is determined by each generation so as to maximize expected lifetime utility, taking into account the welfare of future generations. Under a pay-as-you-go system with intergenerational transfers, demand for retirement benefits by the working population takes into account taxes paid by descendants. It is shown that the two modes of finance are equivalent in terms of all real aggregates. Effects of changes in expected lifetime and in the birth rate are analyzed. Starting at the optimal level, a compulsory balanced increase in social security taxes and benefits is shown to increase short-run savings.

The Nature and Implications of the Reswitching of Techniques

I. Introduction, 526. — II. Alternative discrete capital models, 528. — III. Reswitching in two-good technologies, 531. — IV. Reswitching in a general capital model, 538. — V. Some additional implications for economic theory, 546.

Optimum and Risk-Class Pricing of Annuities

When information on longevity (survival functions) is unknown early in life, individuals have an interest to insure themselves against future ’risk-class’ classification. Accordingly, the First-Best typically involves transfers across states of nature. Competitive equilibrium cannot provide such transfers if insurance firms are unable to precommit their customers. On the other hand, public insurance plans that do not distinguish between ’risk-class’ realizations are also inefficient. It is impossible, a-priori, to rank these alternatives from a welfare point of view.

Direct Versus Indirect Remedies for Externalities

This paper is concerned with tax policies designed to obtain an improved competitive allocation in the presence of consumption externalities. It is known that the full optimum can, in general, be attained only through the imposition of excise taxes at different levels for different individuals. Since these may be ruled out (possibly because of implementation costs), one is confined to consider second-best taxes. The common interpretation of the Pigouvian principle has called for taxes on the externality-creating commodities. With no relationships between the consumption of different commodities the Pigouvian principle is obviously impeccable. But the existence of substitutes or complements for an externality-causing commodity raises the possibility of indirect policies: treating the externality through the markets for related goods. Obviously, if the direct policy is not feasible, the indirect treatment may provide some partial remedy. We show, however, that even when direct policies are available, the overall optimum may involve only indirect policies. An example with such a result is provided in the paper. We also list a number of cases in which the traditional prescription is confirmed, and the overall optimum involves only direct policies.