Externalities and optimal taxation

This paper reexamines the optimal tax design problem (income and commodities) in the presence of externalities. The nature of the second–best, and the choice of the tax instruments, are motivated by the informational structure in the economy. The main results are: (i) environmental levies (linear or nonlinear) differ in formula from Pigouvian taxes by the expressions for the optimal tax on private goods; (ii) externalities do not affect commodity tax formulas (linear and nonlinear) for private goods; (iii) externalities do not affect the income tax structure if commodity taxes are nonlinear and affect it if commodity taxes are linear; and (iv) a general income tax plus strictly Pigouvian taxes are sufficient for efficient taxation if individuals of different types have identical marginal rates of substitution (at any given consumption bundle).     

Environmental taxes with heterogeneous consumers: an application to energy consumption in France

This paper constructs a model with four groups of households who have preferences over labor supply, consumption of polluting (energy related) and non-polluting (non-energy) goods, and emissions. It quantifies the model for the French economy and computes its optimal tax equilibria under nine second-best tax regimes. We find that the redistributive role of environmental taxes requires the polluting goods to be taxed at a rate much below their marginal social damage. These goods may even require an outright subsidy if the society values equality ‘a lot’. Secondly, if environmental taxes that have an exclusively externality-correcting role, they benefit all types—although the gains are rather modest. The gains and losses become more substantial when environmental taxes have a redistributive role as well. Third, setting the environmental tax at its Pigouvian level, rather than its optimal externality-correcting-cum-redistributive level, benefits the high-income group at the expense of the low-income groups. Fourth, nonlinear taxation of polluting goods, and nonlinear commodity taxation in general, is a powerful redistributive mechanism. Fifth, introducing environmental taxes in the current French tax system, with its suboptimal income taxes, results in substantial welfare gains for the highest income group and a sizable loss for the least well-off persons.     

On Optimal Commodity Taxes When Consumption Is Time Consuming

This paper studies the problem of optimal taxation of commodities when consumption is a time‐consuming activity. This is done under two distinct preference separability assumptions: between goods and labor supply, and between goods and leisure. It argues that with the labor separability, the traditional uniform taxation results of optimal tax theory continue to hold. With leisure separability, on the other hand, consumption time is a major ingredient of optimal tax rates. However, the relationship between consumption time and optimal tax rates depends crucially on the representation of the economy. In representative consumer economies, time differences determine the pattern of optimal tax rates so that goods whose consumption take more time are subjected to higher tax rates. When individuals have different earning abilities, redistributive, incentive, and efficiency considerations also come into play resulting in a complex relationship. The paper derives formulas for optimal commodity taxes in this case on the basis of three different tax structures: linear commodity taxes in combination with linear and nonlinear income taxes, and nonlinear commodity taxes in combination with nonlinear income taxes.     

Optimal climate and fiscal policy in an OLG economy

This paper develops a climate–economy model to study the joint design of optimal climate and fiscal policies in economies with overlapping generations (OLGs). I demonstrate how capital taxation, if optimal, drives a wedge between the market costs of carbon (the net present value of marginal damages using the market interest rate) and the Pigouvian tax (the net present value of marginal damages using the consumption discount rate of successive OLGs). In contrast to deterministic infinitely lived representative agent models, at the optimum, the capital income tax is positive, the carbon price equals the market costs of carbon but it falls short of the Pigouvian tax when (i) preferences are not separable over consumption and leisure; and (ii) labor income taxes cannot be age-dependent. I also show that restrictions on climate change policy provide a novel rationale for positive capital income taxes.     

Optimal Tax and Public Investment Rules for Congestion Type of Externalities

Optimal government policy is considered in a second-best framework where consumers and producers cause an externality of the congestion type and income distribution issues are taken into account. The theoretical results of the optimal tax literature are adapted using the concept of the net social Pigouvian tax. An illustrative AGE model uncovers the relative importance of its components. The model demonstrates that the level of the externality tax does not depend strongly on distribution concerns, as reoptimization of the other taxes ensures that the income distribution objective is reached. The model also allows us to study the interaction between externality taxes and public abatement.     

Optimal consumption and the environment Choosing between ‘clean’ and ‘dirty’ goods

In this paper, a model with heterogeneous consumption goods is presented. Consumers are assumed to choose between two different consumption goods, characterized by a different impact on the environment. This implies that, in a decentralized economy, government can sustain the social optimum by setting two Pigouvian taxes: one on production as a whole and the other on dirty consumption acting as an incentive in favour of clean consumption. In accordance with the previous literature, a trade-off between a clean environment and economic activity evolves. However, this trade-off is now mitigated by the additional taxation on polluting consumption which allows the control of pollution stock evolution through the substitution between clean and dirty commodities.     

Voting over selfishly optimal tax schedules: Can Pigouvian tax redistribute income?

This paper studies pairwise majority voting over selfishly optimal nonlinear income tax schedules proposed by a continuum of individuals who differ in privately observable skills and make consumption comparisons, which creates a negative positional externality. It shows that the tax schedule preferred by the median skill type will win the voting contest. Given a reference consumption defined as the average consumption in the population, all skills face the same Pigouvian tax rate in the utilitarian optimum, whereas in selfish optima high skills face a Pigouvian tax rate larger than that facing low skills, generating a novel income redistributive effect. Under a constant elasticity of labor supply, two more results are obtained. First, for Pareto, Champernowne, Weibull, and lognormal skill distributions, the selfishly optimal tax schedule facing high (low) skills tends to be more progressive when the bottom‐skill's (top‐skill's) status concern intensifies. Second, it identifies the conditions under which, in the voting equilibrium, high skills face higher marginal tax rates while low skills face lower ones than what they face in the utilitarian optimum.     

Consumption externalities and direct versus indirect corrective pricing

In a competitive economy with consumption externalities arising only if some commodities are put to particular uses and where individual marginal contributions to the level of the externality may differ among individuals, a first best Pareto-optimum can be attained through a set of Pigouvian taxes discriminating between users and uses of the externality-generating commodities. In the present paper we shall discuss the optimal structure of commodity taxes in the case that policy discrimination is not possible or feasible. If policy discrimination between users or uses is not possible, we show that apart from taxing or subsidizing the direct sources of externalities, it may be optimal to impose taxes or subsidies on related goods, i.e., indirect corrective pricing.     

Direct versus indirect pigovian taxation

This paper considers the theory of optimal taxation in the presence of externalities when it is the uses of commodities in particular consumption processes which generate externalities, rather than the consumption of certain commodities as such. If the government is constrained to using ordinary commodity taxes (for reasons of imperfect information, costly control, etc.), it is demonstrated that there is a case for having taxes or subsidies on related goods in addition to a tax on the externality-creating commodity itself. The analysis also identifies the conditions under which related goods should be subsidized or taxed.     

Revenue and Progressivity Neutral Changes in the Tax Mix

There has been much debate about the redistributive implications of a consumption tax and the treatment of low income households. This article presents a general model which allows for the interdependence between income and consumption taxes, while allowing for transfer payments to the low paid. The appropriate adjustment of transfer payments in response to a change in the tax mix, in order to maintain a fixed real value of transfers, is examined. The use of exemptions, of those goods for which the proportion of expenditure falls as total household expenditure rises, in order to increase the progressivity of consumption taxes is also considered. The model enables changes in the tax mix, which are both revenue and progressivity neutral, to be devised.     

Optimal Taxation in Life-Cycle Economies

We use a very standard life-cycle growth model, in which individuals have a labor-leisure choice in each period of their lives, to prove that an optimizing government will almost always find it optimal to tax or subsidize interest income. The intuition for our result is straightforward. In a life-cycle model the individual's optimal consumption-work plan is almost never constant and an optimizing government almost always taxes consumption goods and labor earnings at different rates over an individual's lifetime. One way to achieve this goal is to use capital and labor income taxes that vary with age. If tax rates cannot be conditioned on age, a nonzero tax on capital income is also optimal, as it can (imperfectly) mimic age-conditioned consumption and labor income tax rates. Journal of Economic Literature Classification Numbers: E62, H21.     

A Model of Tradeable Capital Tax Permits

Standard models of horizontal capital tax competition predict that, in a Nash equilibrium, states set tax rates inefficiently due to externalities—capital inflow to one state corresponds to capital outflow for another state. Researchers often suggest that the federal government impose Pigouvian taxes to correct for these effects and achieve efficiency. We propose an alternative incentive‐based regulation: tradeable capital tax permits. Under this system, the federal government would require a state to hold a permit if it wanted to reduce its capital income tax rate from some predefined benchmark. These permits would be tradeable across states. We show that, if the federal government sets the correct number of total permits, then social efficiency is achieved. We discuss the advantages of this system relative to the canonical suggestion of Pigouvian taxes.     

Is commodity taxation unfair?

In a model where agents have unequal skills and heterogeneous preferences about consumption goods and leisure, this paper studies how to combine commodity taxes and non-linear income tax. It proposes a particular social welfare function on the basis of fairness principles. It then derives a simple criterion for evaluating the social welfare consequences of various tax schedules. Under the proposed approach, the optimal tax should have no commodity tax for some range of consumptions, and income redistribution would feature high subsidies to the working poor. It is also shown that, even when the income tax fails to be optimal, commodity taxes may not improve social welfare.     

Welfare Effects of Different Public Expenditures and Taxes in the Netherlands

This paper explores the welfare effects of public consumption, income transfers and public investment financed through different types of taxes. One surprising result is that, contrary to public consumption goods, public capital goods do not necessarily become less attractive if distortionary taxes, rather than lump-sum taxes, are necessary to finance them. The numerical simulations reveal that the net welfare effects of public investments in the Netherlands are typically positive if financed through lump-sum taxes or distortionary taxes on labor. However, if a source-based capital tax is adopted to finance public investments, the overall welfare effect may be negative.     

THE BUILT-IN FLEXIBILITY OF INCOME AND CONSUMPTION TAXES IN NEW ZEALAND

This paper provides estimates of individual and aggregate revenue elasticities of income and consumption taxes in New Zealand, based on the 2001 tax structure and expenditure patterns. Using analytical expressions for revenue elasticities at the individual and aggregate levels, together with a simulated income distribution, values for New Zealand were obtained. Results using equi-proportional income changes suggest that the aggregate income and consumption tax revenue elasticities are both fairly constant as mean income increases, at around 1.3 and 0.95 respectively. This latter estimate assumes that increases in disposable income are accompanied by approximately proportional increases in total expenditure. If there is a tendency for the savings proportion to increase as disposable income increases, a somewhat lower total consumption tax revenue elasticity, of around 0.9, is obtained for 2001 income levels. However, non-equiproportional income changes are more realistic. Allowing for regression towards the geometric mean income reduces these elasticities, giving an elasticity for income and consumption taxes combined that is only slightly above unity. Examination of the tax-share weighted expenditure elasticities for various goods also revealed that, despite the adoption of a broad based GST at a uniform rate in New Zealand, the persistence of various excises has an important effect on the overall consumption tax revenue elasticity, especially for individuals at relatively low income levels.     

Emission taxes and the market for abatement goods and services

This paper examines the effect of emission taxes on pollution abatement and social welfare, when abatement goods and services are provided by a Cournot oligopoly with free-entry. We point out initially that a higher tax not only increases demand for abatement; it also makes polluters less sensitive to price. This attracts a larger number of abatement suppliers while possibly inducing each one of them to produce less. Total abatement always goes up, however, when the delivery of abatement goods and services exhibits decreasing returns to scale. We then calculate the welfare-maximizing emission tax and compare it to the Pigouvian tax.     

我国流转税收入分配效应的实证分析

对2002-2009年我国增值税、消费税和营业税在不同收入户城镇居民间的分布及其对收入分配的影响进行综合分析,可得出三点基本判断:一是增值税表现出明显的累退性,且累退的症结在于适用低税率商品的消费需求缺乏收入弹性;二是不同消费品的调节效果相互抵消,消费税对收入分配的整体影响并不明显,但呈逐步向累进性发展的趋势;三是营业税表现出稳定的累进性。全部流转税呈现非常轻微的累退性,决定流转税收入调节效果的主导因素是消费品的需求收入弹性。通过恰当选择课税对象和实施差别税率,特定流转税完全有可能起到缩小收入分配差距的作用。     

Intergenerational Allocation of Government Expenditures: Externalities and Optimal Taxation

This paper studies optimal capital and labor income taxes when the benefits of public goods are age‐dependent. Provided the government can impose a consumption tax, it can attain the first‐best resource allocation. This involves the uniform taxation of the cohorts' labor income and a zero capital income tax. With no consumption tax and optimally chosen government spending, labor income should be taxed nonuniformly across cohorts and the capital income tax should be nonzero. Deviations of the public goods from their respective optima create distortions. These affect the labor supply decisions of both cohorts and capital accumulation, providing a further reason to tax (or subsidize) capital income.     

Trade,environment, and income inequality: An optimal taxation approach

In a small open economy, how should a government pursuing both environmental and redistributive objectives design domestic taxes when redistribution is costly? And how does trade liberalization affect the economy's levels of pollution and inequalities, when taxes are optimally and endogenously adjusted? Using a general equilibrium model under asymmetric information with two goods, two factors (skilled and unskilled labor), and pollution, this paper characterizes the optimal mixed tax system (nonlinear income tax and linear commodity and production taxes/subsidies) with both production and consumption externalities. While optimal income taxes are not directly affected by environmental externalities, conditions are derived under which under‐ or over‐internalization of social marginal damage is optimal for redistributive considerations. Assuming that redistribution operates in favor of the unskilled workers and that the dirty sector is intensive in unskilled labor, simulations suggest that trade liberalization involves a clear trade‐off between the reduction of inequalities and the control of pollution when the source of externality is only production; this is not necessarily true with a consumption externality. Finally, an increase in the willingness to redistribute income toward the unskilled results paradoxically in less pollution and more income inequalities.     

Taxation, Bequests, and Short and Long Run Timber Supplies: An Overlapping Generations Problem

This paper uses an overlapping generations model with one-sided altruism to study the effects of several forest taxes that target bequests and affect timber supply. Unlike previous work, we investigate bequests and timber supply in both the short and long run when bequests are costly (e.g., taxed). The landowner's problem is examined in the short run, while the government's problem is examined in the long run assuming the existence of a steady state. We also consider taxes targeting harvests, growth, savings and bequests. Several new results are established concerning the interactions of taxes that might be used by a government to alter short and long run forest capital stocks: (i) the presence of a forest bequest tax affects the neutrality of harvest tax in both the short and long run, (ii) in the long run the bequest tax decreases bequests and timber supplies. When the bequest tax is not present, the capital income tax is neutral with respect to bequest and timber supply, while the harvest tax is neutral only if forest productivity is also not taxed. Finally, (iii) in the short run, the substitution and total effects of taxes in landowner decisions generally depend on the presence of the bequest tax. The results have implications for Pigouvian tax design and second best tax choice.