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We study optimal tax design based on the idea that policy-makers face trade-offs between multiple margins of redistribution. Within a Mirrleesian economy with earnings, consumption and retirement savings, we derive a novel formula for optimal income and savings distortions based on redistributional arbitrage. We establish a sufficient statistics representation of the labor income and capital tax rates on top income earners in dynamic environments, which relies on the observed distributions of both income and consumption. Because consumption has a thinner Pareto tail than income, our quantitative results suggest that it is optimal to shift a substantial fraction of the top earners' tax burden from income to savings.

In this work I want to find the welfare-optimizing degree of tax progressivity for labor income. To reach this ambitious goal I develop a general equilibrium model in the context of an overlapping generations life-cycle economy with heterogeneity. The economy consists of three different household types, namely married couples, single males and single females. The income is determined by an age- and gender-dependent productivity and a stochastic component. Women can decide between working not at all, part-time or full-time while all men in the economy are assumed to work full-time until they retire. There are utility costs of working for women and transfers for non-working women, both depend on marital status. There are different tax functions of the same form for singles and married couples. I solve the model using Bellman equations and only look at the model in stationary equilibrium. I calibrate the model to US data from PSID to match labor market decisions of single and married women. Then tax progressivity is optimized in two different settings. At first, the optimal tax progressivity for each household type is determined separately by only allowing his tax parameters to change. Couples would prefer a degressive tax system, because their income in my economy is always high enough for them to profit from this tax reform. The lower tax rate for higher incomes sets an incentive for less productive females to join the labor market. This reaction already finances the tax, because even though couple households are taxed less, there is more labor income to tax.The optimal degree of tax progressivity for female singles is larger than in the tax function of the calibrated model. They want to insure themselves better against negative income shocks and more single women are able to work part-time in their optimum opposed to the calibrated model. Labor participation of single females rises overall and their wealth shrinks a little as expected, because in more progressive tax systems the incentives to save are smaller. For single males a corner solution on a restricted range for optimal tax progressivity is found - the most progressive tax system allowed seemingly is the best option for male singles, because they have no way of reacting to changes in labor income taxes and the only goal they have is to insure themselves agains negative income shocks as good as possible.Next, I look for the optimal tax progressivity for singles in general, combining female and male singles. Here the same scenario occurs as in optimizing single males' tax progressivity - a corner solution on the high end of the restricted area of tax progressivities is found to be optimal. The intuition behind the solution is different in this scenario. Single women earn a lot less than single males in the base scenario and the very progressive tax leads to a shift of after-tax labor income from men to women and a huge increase of part-time working single females, because the progressive tax of course also applies to labor income of part-time work. Overall, labor participation is 100\% after this tax reform.\\Finally, the optimal tax progressivity for all types of households together is identified. The restriction of progressivity degree being the same for married couples and singles is imposed. The optimal tax progressivity is very close to the real one, but the difference in tax levels for singles and married couples is huge. The tax level of singles is way lower than the one of married couples, which leads to significant shifts in after-tax labor income from couples to singles. Basically all singles get transfers for working in this system - financed by married couples. As a consequence, a large share of married women switches from working part-time in the benchmark model to working full-time in the optimum. In contrast, more single women prefer to work part-time in the optimum. Because the solution presented above obviously is not Pareto improving, also a set of Pareto improving combinations of progressivity levels is visualised.

Wir analysieren die Auswirkungen einer Kapital- und Einkommenssteuerreform auf die Wohlfahrt der österreichische Bevölkerung. Zu diesem Zweck entwickeln wir ein Gleichgewichtsmodell überlappender Generationen mit unerwarteten Einkommensschocks, endogenem Angebot an Arbeitskräften und Heterogenität der persönlichen Fähigkeiten. Die Lebenszyklusstruktur des Modells ermöglicht eine detaillierte Identifizierung und Zerlegung der potenziellen Wohlfahrtseffekte., We analyse the welfare impact of capital and labor income tax reforms on the Austrian population. To this end, we develop an overlapping generations general equilibrium model with idiosyncratic income shocks, endogenous labor supply, and heterogeneity in permanent abilities. The life-cycle structure of the model allows to identify and decompose potential welfare effects in great detail.

Earnings dynamics are much richer than typically assumed in macro models with heterogeneous agents. This holds for individual-pre-tax and household-post-tax earnings and across administrative (Social Security Administration) and survey (Panel Study of Income Dynamics) data. We study the implications of two processes for household, post-tax earnings in a standard life-cycle model: a canonical earnings process (that includes a persistent and a transitory shock) and a rich earnings dynamics process (that allows for age-dependence of moments, non-normality, and nonlinearity in previous earnings and age). Allowing for richer earnings dynamics implies a substantially better profit of the evolution of cross-sectional consumption inequality over the life cycle and of the individual-level degree of consumption insurance against persistent earnings shocks. Richer earnings dynamics also imply lower welfare costs of earnings risk, but, as the canonical earnings process, do not generate enough concentration at the upper tail of the wealth distribution.

This paper considers the optimal taxation of savings intermediation and payment services in a dynamic general equilibrium setting, when the government can also use consumption and income taxes. When payment services are used in strict proportion to final consumption, and the cost of intermediation services is fixed and the same across firms, the optimal taxes are generally indeterminate. But, when firms differ exogenously in the cost of intermediation services, the tax on savings intermediation should be zero. Also, when household time and payment services are substitutes in transactions, the optimal tax rate on payment services is determined by the returns to scale in the conditional demand for payment services, and is generally different to the optimal rate on consumption goods. In particular, with constant returns to scale, payment services should be untaxed. These results can be understood as applications of the Diamond-Mirrlees production efficiency theorem. Finally, as an extension, we endogenize intermediation, in the form of monitoring, and show that it may be oversupplied in equilibrium when banks have monopoly power, justifying a Pigouvian tax in this case.

This paper examines the determination of the optimal threshold value for Goods and Services Tax (GST) for imported units arising from internet orders. The concept of an optimal threshold is wider than simply the maximisation of revenue net of administrative costs. At the optimal threshold, the marginal cost of funds from GST is equated to the ratio of the marginal value of public funds to their marginal social value, reflecting the value judgements of a decision maker. The marginal cost of funds allows both for compliance costs and the marginal excess burden arising from a small increase in the threshold. Illustrative numerical values are reported, showing the sensitivity to administrative costs, the demand elasticity and, importantly, value judgements.

We study the optimal design of integrated education finance and tax systems. The distribution of wages is endogenously determined by the costly education decisions of heterogeneous individuals before labor market entry. Consistent with empirical evidence, this human capital investment decision is risky. We find that an integrated education and tax system in which the government provides education loans to young individuals coupled with income-contingent repayment can always be designed in a Pareto optimal way. We present a simple empirically driven application of the framework to US data in which individuals make a college entry decision. We find the optimal repayment schemes for college loans can be well approximated by a schedule that is linearly increasing in income up to a threshold and constant afterwards. So although the full optimum could lead to complicated non-linear schedules in theory, very simple instruments can replicate it fairly well. The welfare gains from income-contingent repayment are significant.

This paper examines the optimal time path of the tax rate, in a model where an increasing ratio of government debt to GDP is projected in the absence of policy changes.

Felix Bierbrauer gibt einen Überblick der Theorie optimaler Steuern. Der Schwerpunkt liegt auf der Weiterentwicklung dieser Theorie seit der Jahrtausendwende. Er stellt aber auch die konzeptionellen Grundlagen dar sowie die klassischen Resultate zur optimalen Besteuerung von Arbeitseinkommen, Kapitaleinkommen und Konsumausgaben. Die Theorie hat in den letzten Jahren eine quantitative Dimension hinzugewonnen, die es beispielsweise erlaubt, die Einkommensteuerzahlungen von Spitzenverdienern im Status quo und unter einem optimal gestalteten Einkommensteuertarif miteinander zu vergleichen. Die jüngere Literatur hat außerdem geklärt, unter welchen Bedingungen die Beschäftigungsaufnahme von Geringverdienern subventioniert werden sollte. Der New-Dynamic-Public-Finance-Ansatz hat ein neues und wichtiges Argument entwickelt, das für eine Besteuerung von Kapitaleinkommen spricht. Weitere Themen der jüngeren Literatur sind der Wettbewerb verschiedener Regierungen um leistungsfähige und mobile Steuerzahler sowie die Interdependenz von optimaler Steuerpolitik und optimal gestalteten Staatsausgaben.

Governments design taxation schemes to capture resource rent. However, they usually propose contracts with limited duration and possess less information on the resources than the extractive firms do. This paper investigates how information asymmetry on costs andan inability to commit to long-term contracts affect tax revenue and the extraction path.This paper assumes that governments maximize the tax revenue contingent on the quantity extracted. This study gives several unconventional results. First, when information asymmetry exists, the inability to commit does not necessarily lower tax revenues. Second, under asymmetric information without commitment, an efficient firm may produce during the first period more or less than under symmetric information. Hence, the inability to commit has an ambiguous effect on optimal contract duration. Third, an increase in the discount factor may shift the extraction towards the first period which contradicts Hotelling’s rule., Economics Working Paper Series, 16/253

The paper discusses various possible approaches to turnover taxation in cyberspace. It shows that the main challenge of the new economy is to effectively cope with B2C international trade in digital online goods and services. However, most approaches to turnover taxation discussed in the literature give rise to several surveillance, efficiency, incentive, and identification problems. As a consequence, there seem to be only two appropriate approaches to deal with the special characteristics of international trade in cyberspace, the country-of-origin principle combined with a taxation of digital goods and services at the physical location of producers, and the community principle in combination with a withholding tax (WITHVAT).

Dieses Diskussionspapier beleuchtet die PRME-Verpflichtung der Hochschule Pforzheim und die daraus resultierenden Probleme (Abschnitt 2) aus vier Perspektiven: der erkenntnistheoretischen (Abschnitt 3), der erfahrungswissenschaftlichen (Abschnitt 4), der juristischen (Abschnitt 5) und einer sozial-psychologischen (Abschnitt 6). Es kommt zu dem Ergebnis, dass dieses Projekt nicht nur verfassungsrechtlichen Grundsätzen, wie dem Prinzip der Gewaltenteilung (Art. 1 (3) GG) wi-derspricht, sondern auch den Erfordernissen einer modernen Forschung und Lehre nicht gerecht wird. In this paper I analyze the PRME-commitment of Pforzheim University and the resulting problems (Section 2) from four different point of views: From the epistemological point of view (Sec-tion 3), from the point of view of empirical sciences (Section 4), from the juridical point of view (Sec-tion 4) and from an socio-psychological point of view (Section 6). The result is: The PRME-commitment and the declared abandonment of the principle of ideological neutrality of the Pforzheim University does not only contradict basic constitutional principles like the division of powers (Art. 1 (3) GG) but also neglect the requirements of modern research and teaching.

Relative consumption effects or status concerns that feature jealousy (in the sense of Dupor and Liu, AER 2003) boost consumption expenditure. If consumption is financed by labour income, such status considerations increase labour supply and, hence, the tax base. A higher taxable income, in turn, can make tax evasion more attractive. We show for various specifications of preferences that the tax base effect generally dominates. Consequently, relative consumption effects tend to reduce tax evasion. This is true, irrespective of whether tax parameters are exogenous, guarantee a balanced budget or are set optimally.

We construct a tractable endogenous growth model with production externalities in which the public capital stock augments investment specific technological change. We characterize the first best fiscal policy and show that there exist several labor and capital tax-subsidy combinations that decentralize the planner's growth rate. The optimal factor income tax mix is therefore indeterminate which gives the planner the flexibility to choose policy rules from a large set. Our model explains why many advanced economies experiencing similar growth rates have widely varying factor income tax rates.

This paper reviews recent developments in the theory of optimal income taxation and draws two broad conclusions with respect to the Hungarian personal income tax system. The first conclusion is that the optimal top marginal tax rate is likely to be higher, perhaps substantially, than the actual rate. The second conclusion is that the optimal tax burden of earnings near the minimum wage is likely to be lower than the actual tax burden. It is discussed how these results depend on the parameters describing labor-supply behavior, the income distribution, and the redistributive preferences of society.

This paper considers the extent to which the standard argument, that the disproportionate excess burden of taxation suggests the use of tax-smoothing in the face of future cost increases, is modified by uncertainty regarding the future. The role of uncertainty and risk aversion are examined using several highly simplified models involving a possible future contingency requiring an increase in tax-financed expenditure.

Domestic consumption taxes on oil products largely differ across countries, ranging from very high subsidies to very high taxes. The empirical literature on the issue has highlighted the role of revenue-raising (Ramsey commodity taxation) and externality correction (Pigovian taxation) motives for national taxation. Isolatedly, the theoretical literature on non-renewable-resource taxation has emphasized the role of the optimum tariff dimension of excise taxes which reflects countries’ non-cooperative exercise of their market power. This paper reconciles these two strands by comprehensively addressing the issue. First, we propose a multi-country model of national taxation with oil – modeled as a polluting exhaustible resource – and some regular commodities. Domestic welfare is maximized with respect to domestic taxes under a revenue-collection constraint. The optimal domestic tax on oil consumption not only consists of a Ramsey inverse-elasticity term and of a Pigovian term, but also of an optimum-tariff component. In fact, resource exhaustibility implies a form of supply inelasticity that magnifies optimum-tariff arguments. Second, based on a multiple regression using a data set with a large number of countries, we test the power of the optimum-tariff tax component in explaining national gasoline taxes. We find strong evidence that this component plays a crucial role in countries’ taxation of gasoline., Economics Working Paper Series, 12/163

Adaptation is omnipresent but people systematically fail to correctly anticipate the degree to which they adapt. This leads individuals to make inefficient intertemporal decisions. This paper concerns optimal income taxation to correct for such anticipation-biases in a framework where consumers adapt to earlier consumption levels through a habit-formation process. The analysis is based on a general equilibrium OLG model with endogenous labor supply and savings where each consumer lives for three periods. Our results show how a paternalistic government may correct for the effects of anticipation-bias through a combination of time-variant marginal labor income taxes and savings subsidies. Furthermore, the optimal policy mix remains the same, irrespective of whether consumers commit to their original life-time plan for work hours and savings decided upon in the first period of life or re-optimize later on when realizing the failure to adapt.

We study Downsian competition in a Mirrleesian model of income taxation. The competing politicians may differ in competence. If politicians engage in vote-share maximization, the less competent politician's policy proposals are attractive to the minority of rich agents, whereas those of the competent politician are attractive to the majority of poor agents. The less competent politician wins with positive probability, which gives rise to a political failure in the sense of Besley and Coate (1998). Political failures are avoided if politicians maximize winning probabilities. Nevertheless, the two equilibria cannot be Pareto-ranked, the minority may be better off under vote-share maximization.

This paper explores the implications of gender-based income taxation in a non- cooperative model of a couple’s time allocation between market work and providing a household public good. We find that the optimal structure of differential taxation by gender is solely determined by spouses’ relative marginal rates of substitution between the public household good and private consumption. Breaking down this general rule into the primitives of the model, the spouse with a lower personal valuation of the public household good should be taxed at a higher rate. If these valuations are identical, a comparative advantage in home production relative to market work will imply a higher marginal tax rate. Using a realistic calibration, we show that these two results may combine to imply a higher optimal tax rate on female labor supply. This result stands in sharp contrast to previous models of gender-based taxation in which households select Pareto efficient allocations. Extending the model to include altruistic preferences, leisure, or human capital accumulation reduces optimal tax rates, while sequential labor supply decisions affect the optimal tax rate of the primary earner in an ambiguous direction.

This paper provides evidence of efficient taxation of groups with heterogeneous levels of tax morale. We set up an optimal income tax model where high tax morale implies a high subjective cost of evading taxes. The model predicts that nice guys finish last: groups with higher tax morale will be taxed more heavily, simply because taxing them is less costly. Based on unique cross-country micro data and an IV approach to rule out reverse causality, we find empirical support for this hypothesis. Income groups with high tax morale systematically face higher average and marginal tax rates. To the best of our knowledge, this is the first paper to investigate whether differences in tax morale affect the distribution of the tax burden across different groups of taxpayers.

This paper develops an overlapping-generations model with heterogeneous agents in terms of earning ability and cash-in-advance constraint. It shows that tax policy cannot fully replicate or neutralize the redistributive implications of monetary policy. While who gets the extra money becomes irrelevant, the rate of growth of money supply keeps its bite. A second lesson is that the Friedman rule is not in general optimal. The results are due to the existence of another source of heterogeneity among individuals besides differences in earning ability that underlies the Mirrleesian approach to optimal taxation. They hold even in the presence of a general income tax and preferences that are separable in labor supply and goods. If differences in earning ability were the only source of heterogeneity, the fiscal authority would be able to neutralize the effects of a change in the rate of monetary growth and a version of the Friedman rule becomes optimal.

In this paper we extend the zero tax at the top result obtained in the closed economy case with bounded skill distributions for the case of unbounded skill distributions in the presence of international labor mobility and tax competition. We show that in the equilibrium for the tax competition game the optimal marginal income tax rate converges to zero as the income level tends to infinity. We further show in simulations that the zero marginal tax result is not a local property: over a large range at the higher end of the income distribution, the optimal tax is approximately given by a lump-sum tax set at its Laffer rate. We further show that the range in which the optimal marginal tax is approximately set to zero is widening as migration costs decrease.

This paper contributes to resolving the puzzle that in practice most countries use ad valorem (corporate income) taxation, while a large part of the tax competition literature views business taxes as unit (wealth) taxation. We point to the dual role that corporate taxation plays in attracting mobile capital, on the one hand, and in absorbing economic rents, on the other hand. In contrast to the previous literature, we show (i) that detrimental tax competition may be less severe in a system of ad valorem taxes than in a system of unit taxes and (ii) that ad valorem taxation may be the equilibrium outcome in a decentralized world where countries decide themselves on the tax system. Interestingly, the decentralized choice of the ad valorem system may be a prisoner's dilemma since the countries' welfare may be higher if they choose unit taxes.

I study a model of a representative individual who has a motive for leaving bequests and is at risk of needing long-term care in old age. I assume - as is typical for OECD countries - that the individual is not fully insured against this risk. Moreover, at realization the individual is unable to adapt labor supply or consumption; then expenditures for long-term care result in a one-to-one reduction of the estate. In this situation a tax on bequests provides insurance and its introduction causes a smaller deadweight loss than an income or consumption tax. I also characterize the optimal tax and transfer system in this model.

The means of contest design may include differential taxation of the prize. This paper establishes that, given a revenue-maximizing contest designer who faces a balanced-budget constraint, the optimal taxation scheme corresponding to an all-pay auction is appealing in two senses. First, it ensures exceptional equitable final prize valuations. Second, it is effective; it yields total contestants' efforts that are larger than those obtained under almost any Tullock-type lottery. Furthermore, when a budget surplus is allowed, the superiority of optimal taxation under the APA is preserved in terms of equity and effectiveness relative to optimal taxation under any contest success function.

The stylized facts suggest a negative relationship between tax progressivity and the skill premium from the early 1960s until the early 1990s, and a positive one thereafter. They also generally imply rising tax progressivity, except for the 1980s. In this paper, we ask whether optimal tax policy is consistent with these observations, taking into account the demographic and technological factors that have also affected the skill premium. To this end, we construct a dynamic general equilibrium model in which the skill premium and the progressivity of the tax system are endogenously determined, with the latter being optimally chosen by a benevolent government. We find that optimal policy delivers both a progressive tax system and model predictions which are generally consistent, except for the 1980s, with the stylized facts relating to the skill premium and progressivity. To capture the patterns in the data over the 1980s requires that we adopt a government policy which is biased towards the interests of skilled agents. Thus, in addition to demographic and technological factors, changes in the preferences of policy-makers appear to be a potentially important factor in determining the evolution of the observed skill premium.

The apparent ubiquity of progressive taxation in advanced democracies has animated research by political economists in the past decade, but little progress has been made in modeling political equilibria over tax policy when labor supply is elastic with respect to taxation. Here, we postulate an economy with two worker types (wage capacities), in which the unskilled are more numerous than the skilled. Preferences are quasi-linear in income and leisure. One political party represents each worker type. A tax policy is any feasible incentive-compatible menu of pre- and post-tax incomes from which each worker must choose. This policy space is three-dimensional. Workers vote stochastically. The equilibrium concept for political competition is party-unanimity Nash equilibrium (PUNE)—thus, parties are both vote-seeking and representative. The set of political equilibria is characterized. We prove that, if the class of unskilled workers is not too large (but greater than one-half), then there always exist equilibria in which a regressive tax policy wins. If, however, that class is sufficiently numerous, or inequality is sufficiently great, then the victory of a progressive policy is guaranteed in all equilibria.

This paper studies the aggregate and distributional implications of introducing user fees for publicly provided excludable public goods into a model with consumption and income taxes. The setup is a neoclassical growth model where agents differ in earnings and second-best policy is chosen by a Ramsey government. Our main result is that the adoption of user fees by the Ramsey government not only increases aggregate efficiency, but it also decreases inequality. This result is in contrast to common view and policy practice.

Heterogeneous firm productivity seems to provide an argument for governments to pursue 'pick-the-winner' strategies by subsidizing highly productive firms more, or taxing them less, than their less productive counterparts. We appraise this argument by studying the optimal choice of effective tax rates in an oligopolistic industry with heterogeneous firms. We show that the optimal structure of tax differentiation depends critically on the feasible level of corporate profit taxes, which in turn depends on the degree of international tax competition. When tax competition is moderate and profit taxes are high, favoring high-productivity firms is indeed the optimal policy. When tax competition is aggressive and profit taxes are low, however, the optimal tax policy is reversed and low-productivity firms are tax-favored.

This paper examines whether myopia (misperception of the long-term care (LTC) risk) and private insurance market loading costs can justify social LTC insurance and/or the subsidization of private insurance. We use a two-period model wherein individuals differ in three unobservable characteristics: level of productivity, survival probability and degree of ignorance concerning the risk of LTC (the former two being perfectly positively correlated). The decentralization of a first-best allocation requires that LTC insurance premiums of the myopic agents are subsidized (at a Pigouvian rate) and/or that there is public provision of the appropriate level of LTC. The support for the considered LTC policy instruments is less strong in a second-best setting. When social LTC provision is restricted to zero, a myopic agent's tax on private LTC insurance premiums involves a tradeoff between paternalistic and redistributive (incentive) considerations and we may have a tax as well as a subsidy on private LTC insurance. Interestingly, savings (which goes untaxed in the first-best but plays the role of self-insurance in the second-best) is also subject to (positive or negative) taxation. Social LTC provision is never second-best optimal when private insurance markets are fair (irrespective of the degree of the proportion of myopic individuals and their degree of misperception). At the other extreme, when the loading factor in the private sector is sufficiently high, private coverage is completely crowded out by public provision. For intermediate levels of the loading factors, the solution relies on both types of insurance.

We formulate a dynamic game model of trade in an exhaustible resource with a quantity-setting cartel. We compute the feedback Nash equilibrium and two Stackelberg equilibria under two different leadership scenarios: leadership by the strategic importing country, and leadership by the exporting cartel. We numerically show that as compared to the Nash equilibrium, both players are better off if the importing country is the leader. The follower is worse off if the exporting cartel is the leader. Among the three game-theoretic outcomes, the world welfare is highest under the importing country's leadership and lowest under the exporting country's leadership.

Addressing extensive labour supply responses, the literature has established a case for larger transfers to the working poor than to even poorer non-working people. This paper casts new light on this result. I argue that the result hinges crucially on the labour supply responses of people in income brackets above that of the working poor. Then distinguishing between more and less poor working people, I show that if a single working type faces a negative tax, it is the poorer one. I extend the analysis by endogenising wages and show that key conditions will be of the same form as with exogenous wages.

We analyze the impact of tax morale on the optimal progressive labor income taxation. Only universal basic income is financed from a linear tax and the financing of public goods is neglected. Each individual supplies labor and (un)declares earning, depending on his labor disutility and tax morale. Limiting the utilitarianism to the poorer parts of the population (defined by the inclusion share), the optimal tax rate is an increasing function of the tax morale and a decreasing function of the inclusion share, provide that the average wage of the included is higher than 0.54 times the average wage.

This paper examines the optimal entry policy towards oligopoly in a globalized world. In an open economy free entry is socially suboptimal, but corrective tax policy to curb entry proves insufficient unless internationally harmonized. Thus, while conferring the gains from trade, globalization prevents countries from pursuing the optimal entry policy. When countries are small, the gains from trade dominate the losses from a suboptimal entry policy, but as markets grow the result is reversed, making trade inferior to autarky. Therefore, the need for tax harmonization grows as the world economy grows. This paper also contributes to the international tax competition literature through the discovery of the reverse home market effect.

Optimal climate policy is studied. Coal, the abundant resource, contributes more CO2 per unit of energy than the exhaustible resource, oil. We characterize the optimal sequencing oil and coal and departures from the Herfindahl rule. 'Preference reversal' can take place. If coal is very dirty compared to oil, there is no simultaneous use. Else, the optimal outcome starts with oil, before using oil and coal together, and finally coal on its own. The 'laissez-faire' outcome uses coal forever or starts with oil until it is no longer profitable to do so and then switches to coal. The optimum requires a steeply rising CO2 tax during the oil-only phase and a less steeply rising CO2 tax during the subsequent oil-coal and coal-only phases to avoid the abrupt switch from oil to coal thus leaving a lot of oil in situ. Finally, we analyze the effects on the optimal transition times and carbon tax of a carbon-free, albeit expensive backstop (solar or wind). Without a carbon tax, a prohibitive coal tax leads to less oil in situ, substantially delays introduction of renewable, and thus curbs global warming substantially. Subsidizing renewables to just below the cost of coal does not affect the oil-only phase. The gain in green welfare dominates the welfare cost of the subsidy if the subsidy gap is small and the global warming challenge is acute.

This paper extends the previous literature on optimal redistributive taxation in the presence of externalities to a multi-externality setting. While taxes on income and on 'clean' commodities are still unaffected by the externalities, which confirms previous results, I find that the existence of more than one externality-generating commodity has important implications for the optimal Pigouvian tax rates. In general the Pigouvian parts of taxation depend also on the externalities induced by the consumption of the other commodities, implying that the interdependence of the externality-generating commodities is relevant for tax policy.

Using a collective model of consumption, we characterize optimal commodity taxes aimed at targeting speci…c individuals within the household. The main message is that distortionary indirect taxation can circumvent the agency problem of the household. Essentially, taxation should discourage less the consumption of a certain group of goods: those for which the slope of the Engel curves is larger for the targeted person.

This article explores the use of workfare as part of an optimal tax mix when labor supply responses are along the extensive margin. Particular attention is paid to the interaction between workfare and an earned income tax credit, two policies that are designed to provide additional incentives for individuals to enter the labor force. This article shows that, despite their common goal, these policies are often at odds with each other.

This paper presents the case for tax progressivity based on recent results in optimal tax theory. We consider the optimal progressivity of earnings taxation and whether capital income should be taxed. We critically discuss the academic research on these topics and when and how the results can be used for policy recommendations. We argue that a result from basic research is relevant for policy only if (a) it is based on economic mechanisms that are empirically relevant and first order to the problem, (b) it is reasonably robust to changes in the modeling assumptions, (c) the policy prescription is implementable (i.e., is socially acceptable and is not too complex). We obtain three policy recommendations from basic research that satisfy these criteria reasonably well. First, very high earners should be subject to high and rising marginal tax rates on earnings. Second, low income families should be encouraged to work with earnings subsidies, which should then be phased-out with high implicit marginal tax rates. Third, capital income should be taxed. We explain why the famous zero marginal tax rate result for the top earner in the Mirrlees model and the zero capital income tax rate results of Chamley-Judd and Atkinson-Stiglitz are not policy relevant in our view.

This paper extends the Mirrlees (1971) model of optimal income redistribution with optimal corrective taxes to internalize consumption externalities. It is demonstrated that the optimal second-best tax on an externality-generating good should not be corrected for the marginal cost of public funds. The reason is that the marginal cost of public funds equals unity in the optimal tax system, since marginal distortions of taxation are equal to marginal distributional gains. The Pigouvian tax needs to be modified, however, if polluting commodities or environmental quality are more complementary to leisure than non-polluting commodities are.

We examine the optimal taxation problem in a two sector neoclassical economy with workers and capitalists. We show that in a steady state of this economy the optimal policy may involve a capital income tax or subsidy, differential taxation of labour income and redistribution. The level and the direction of the redistribution associated with such an optimal policy depends on the pre tax allocation of capital but not on the social weights attached to the different groups of taxpayers. Excess production of consumption goods creates a difference between the social marginal values of consumption and investment which in turns violates the production efficiency condition. Such a difference can be undone by taxing capital income from the consumption sector, and with this optimal policy the government can implement a redistribution scheme where both workers and capitalists bear the burden of distorting taxes. On the contrary, an optimal policy that involves a capital income subsidy in the production of consumption can implement allocations that minimize the relative price difference between consumption and investment that resulted from the excess production of investment goods.

We study the optimal combination of corporate tax rate and tax base in a model of a small open economy with heterogeneous firms. We show that it is optimal for the small country's government to effectively subsidize capital inputs by granting a tax allowance in excess of the true costs of capital. Economic integration reduces the optimal capital subsidy and drives low-productivity firms from the small country's home market, replacing them with high-productivity exporters from abroad. This endogenous policy response creates a selection effect that increases the average productivity of home firms when trade barriers fall, in addition to the well-known direct effects.

The paper characterizes the optimal tax policy and the optimal quality of day care services in a OLG model with warm-glow altruism where parental choices over child care arrangements affect the probability that the child becomes a high-skilled adult in a type-specific way. With respect to previous contributions, optimal tax formulas include type-specific Pigouvian terms which correct for the intergenerational externality in human capital accumulation. Our numerical simulations suggest that a public policy that disregards the effects of parental time on children's human capital entails a welfare loss that ranges from 0:2% to 5:7% of aggregate consumption.

We study optimal tax and educational policies in a dynamic private information economy, in which ex-ante heterogeneous individuals make an educational investment early in their life and face a stochastic wage distribution. We characterize labor and education wedges in this setting analytically and numerically, using a calibrated example. We present ways to implement the optimum. In one implementation there is a common labor income tax schedule, and a repayment schedule for government loans given out to agents during education. These repayment plans are contingent on loan size and income and capture the history dependence of the labor wedges. Applying the model to US-data and a binary education decision (graduating from college or not) we characterize optimal labor wedges for individuals without college degree and with college degree. The labor wedge of college graduates as a function of income lies first strictly above their counterparts from high-school, but this reverses at higher incomes. The loan repayment schedule is hump-shaped in income for college graduates.