how do market reforms affect china s responsiveness to environmental policy a large percentage of total investment in china is allocated by the central government at below market interest rates in pursuit of non economic objectives this has resulted in low rates of return and a high number of non performing loans threatening the future health of the chinese economy as a result reform of capital markets is a high priority of the chinese government at the same time the country is implementing various environmental policies to deal with serious pollution issues in this paper we ask how reforms of the capital market will affect the functioning of a carbon tax this allows us to assess how china s willingness to join global efforts to reduce carbon emissions is influenced by china s current efforts to reduce investment subsidies we compare the costs of a carbon tax in a reformed economy with the costs of a carbon tax in the current subsidized economy we find that in the subsidized economy the tax interaction effect dampens the effect of a carbon tax resulting in smaller reductions in emissions than what would result in a reformed economy importantly we also find that the effect on economic welfare from a carbon tax is lower in the subsidized economy in fact for lower levels of reductions the carbon tax is actually welfare improving these results have important implications for an economy undergoing economic transition the carbon tax rate required to achieve a certain level of emission reductions will be higher in an economy with capital subsidies however the welfare implications of the tax indicate that the current system with capital subsidies is highly distorting implying that there is a high efficiency cost for the non economic objectives the government is pursuing by maintaining this system of subsidies

are environmental taxes a free lunch issues in modelling the macroeconomic effects of carbon taxes applied analysis of output and employment effects from revenue neutral environmental taxation depends critically on how the supply side of the economy is modelled despite the long history of theoretical and computable general equilibrium supply side models the empirical basis of much of this work has been quite weak until recently however most econometric attempts to capture factor substitution effects have not been based on theoretically consistent structures this paper examines the methodological issues that underlie these problems and compares the results of imposing environmental taxes in two different econometric modelling structures the implications of theories of endogenous technical progress on the simulation properties of such models are discussed and a simple empirically based model that embodies some of these features is presented

efficient environmental taxation under worker firm bargaining we study an economy with free firm entry and unemployment due to firm worker bargaining over each firm s surplus and where firms cause pollution that can be reduced by initial investments an uncompensated increase in the pollution tax reduces pollution but increases unemployment implying a tradeoff between the two when tax revenues are used to subsidize either firms hiring or investments employment may also increase creating a double dividend from the pollution tax a pollution tax increase used to subsidize current employment is always less effective than a hiring subsidy and is totally ineffective when subsidies equal pollution tax revenues for each individual firm we show that the hypothetical pollution tax implementing the first best solution exceeds the pigouvian tax the second best tax exceeds this first best tax when we have a double dividend and is below it when we do not

commuting transport tax reform and the labour market employer paid parking and the relative efficiency of revenue recycling instruments in this paper the welfare effects of a budget neutral increase in taxes on car commuters are studied in a model that takes into account the presence of employer paid parking at the workplace it is found that the presence of employer paid parking substantially increases the welfare effect of such a tax reform independent of the use of the revenues congestion taxes not only correct congestion externalities they also reduce the inefficiency caused by employer paid parking moreover different congestion effects of alternative recycling instruments and the presence of employer paid parking jointly imply that recycling the tax revenues via higher public transport subsidies may yield much more favourable welfare effects than previously believed it can easily outperform recycling the tax revenues via lower labour taxes finally cashing out parking costs to public transport users is found to generate substantial positive welfare effects numerical analysis confirms the theory

can there be a market for cheap talk information an experimental investigation abstract this paper reports on experiments testing the viability of markets for cheap talk information we find that the level of trade in these markets is very small and eventually vanishes sellers provide low quality information even when doing so does not increase their monetary payoff this contributes to the low demand in the market for information moreover we observe the same very low level of activity in the market for information when sellers face no conflict of interest and the noise in the quality of the transmitted information is much lower hence we argue that the collapse of the market for information is a demand phenomenon and even small uncertainty over the quality of information seems to have a large impact

strategic communication with lying costs i study a model of strategic communication between an uninformed receiver and an informed but upwardly biased sender the sender bears a cost of lying or more broadly of misrepresenting his private information the main results show that inflated language naturally arises in this environment where the sender almost always claims to be of a higher type than he would with complete information regardless of the intensity of lying cost there is incomplete separation with some pooling on the highest messages the degree of language inflation and how much information is revealed depend upon the intensity of lying cost the analysis delivers a framework to span a class of cheap talk and verifiable disclosure games unifying the polar predictions they make under large conflicts of interest i use the model to discuss how the degree of manipulability of information can affect the trade off between delegation and communication copyright 2009 wiley blackwell

second best taxation of emissions and polluting goods abstract this paper studies the problem of the design of an integrated system of second best emission and output taxes in a model where production costs are negatively correlated with their emissions it shows that i the first best pigouvian rule of equating the marginal private benefit of emissions in production to the marginal social damage of emissions must be modified in the second best ii implementation of the modified pigouvian rule requires all firms to face the same marginal emission tax equal to the marginal social damage of emissions plus an adjustment term reflecting optimal tax objectives iii it may not be necessary to directly tax the polluting goods the latter taxes can be subsumed in the emission tax function iv output taxes must be set solely on the basis of optimal tax objectives no pigouvian adjustment is required v if emission taxes are restricted to be proportional and commodity taxes are constrained the modified pigouvian rule will no longer be optimal vi if preferences are weakly separable in emissions and other goods the pigouvian rule remains valid the marginal emission tax is pigouvian and emission and commodity tax instruments can be set separately to address different objectives a proportional emission tax corrects for externalities while commodity taxes are determined solely on the basis of optimal tax considerations

comment on m hoel emission taxes versus other environmental policies the choice of the appropriate instrument in environmental policy is not only a question of theoretical importance it is also of considerable political relevance while environmental taxes are sometimes used to control pollution quotas and direct controls dominate in practice if this observed bias is only due to the nature of policymaking and not supported by economic reasoning politicians are not well advised to use quotas and direct controls instead of environmental taxes hoel discusses popular arguments that are often used by politicians in favour of direct controls and concludes that the results are typically not clear cut in this comment i would like to focus on the employment effects of revenue raising and nonrevenue raising instruments politicians as well as special interest groups often claim that emission taxes increase the cost of production thereby harming employment clearly in the face of high rates of unemployment in many industrialized countries potentially negative employment effects of environmental regulation raise political resistance to green policy the ongoing debate has put

the double dividend second best worlds and real world environmental policy abstract the recent series of papers by bovemberg goulder parry and others argue that the double dividend is unlikely to exist because of second best problems they argue that the imposition of environmental tax in an economy already distorted by income taxes will further distort the economy by reducing incentives to supply labor our paper argues that this is not likely to be the case because of the restrictive assumptions made by these models and because of the role of the environment as a factor of production

computable general equilibrium model analysis of economywide cross effects of social and environmental policies in chile abstract the analysis of the linkages between development policies and social and environmental variables is a neglected area within the development literature this paper focuses on the key interrelations among the economic social and environmental elements of the sustainable development triangle a thorough review is undertaken of both social and environmental policies in chile underlining important economic growth and reforms using the static cge model ecogem chile the economywide impacts of several environmental social and combined policies are simulated for the chilean economy six different policies are simulated three environmental policies that impose different taxes on pm10 so 2 and no 2 emissions respectively the same tax on pm10 in a context of high unemployment one social policy that increases government transfers to households and a mixed social environmental policy package where the environmental tax on pm10 and the social transfer policy are simulated simultaneously the results show that environmental tax policies may have negative social effects using real disposable income by quintiles as proxy the impacts depend on the use of the new revenues and the status of employment taxing pm10 emission yields better environmental results than taxing so 2 and no 2 social policies do not show negative environmental impacts combined environmental and social policies improve results thus specific compensating social policies would improve environmental policy acceptance while also reducing poverty or strong income distribution disparities the evidence suggests that environmental policies may have social impacts but not vice versa the results show that the ecogem chile model is useful for analyzing systematically and holistically different economywide policies and their impact on the chilean economy winners and losers may be identified as well as the potential magnitude of gains and losses the results obtained are not all straightforward due to indirect effects

how robust is the uniform emissions pricing rule to social equity concerns abstract this paper examines pollution tax differentiation across industries in light of social equity concerns using theoretical and numerical general equilibrium analyses in an optimal tax framework we characterize the drivers for non uniform optimal taxes stemming from the interaction of household heterogeneity with social preferences quantitatively assessing the case of price based co2 emissions control in the u s economy we find that uniform emissions pricing is approximately optimal when social concerns are defined over inequity induced by the environmental tax the deviation from uniform emissions pricing however becomes non negligible when pollution tax rebates deviate much from optimal transfer schemes or when social concerns are defined over both policy induced impacts and inequity unrelated to environmental policy our results are robust to a number of model extensions including the stringency of the environmental target downstream vs upstream taxation pre existing distortionary taxes and parametric uncertainty in firms and households equilibrium tax responses

pollution permits and environmental innovation abstract this paper starts with a warning about the negative impact of plain pollution allowance markets on environmental pollution innovation stand alone spot markets enable the government to expropriate an innovation by offering a competing technology pollution permits that puts an arbitrary downward pressure on the licensing price advance allowances reduce expropriation but still create suboptimal incentives for innovation they have the further drawback that permits are inefficiently used when the innovation occurs options to pollute at a given striking price fare better than allowances because they create private incentives to phase out pollution in the case of innovation we characterize the social optimum and show that it can be implemented by issuing options to pollute inter alia finally the paper compares ex ante and ex post government procurement surprisingly ex post licensing by the innovator to the government may yield a higher licensing fee than an ex ante contract

higher price lower costs minimum prices in the eu emissions trading scheme this paper examines the introduction of a price floor in an emissions trading system ets when some emissions are regulated outside of the ets we theoretically characterize the conditions under which a price floor enhances welfare using a numerical simulation model of the european union we find that moderate minimum prices in the eu ets can reduce the costs of eu climate policy by up to thirty percent we also find that due to tax interaction effects the optimal minimum price in the eu ets should be about four times higher than the average marginal abatement cost in non ets sectors this article is protected by copyright all rights reserved

a note on the strategic choice of spatial price discrimination abstract we investigate the robustness of the tendency for hotelling duopolists to use spatial price discrimination in a model with quadratic transportation costs mill pricing is shown to emerge as the unique equilibrium outcome when firms commit to a price policy before choosing locations and price levels

energy prices and carbon taxes under uncertainty about global warming this paper extends the strategic interactions between producers of fossil fuels concerned about their profits and a taxing government concerned about the consumers welfare for uncertainty global warming follows an ito process stochasticity requires to differentiate between reversible and irreversible emissions in contrast to the deterministic version the unconstrained reversible case allows for a closed form solution but not the more realistic and constrained case nevertheless interesting analytical properties e g about when to stop emissions implicit conservation due to monopolistic supply are derived and complemented by a numerical example

trade association disclosure rules incentives to share information and welfare in this article i propose a monopolistic competition framework to analyze the effects of different disclosure rules used by trade associations on the incentives to share information and on the welfare of consumers firms and society this framework is appropriate whenever a single firm cannot influence aggregate market magnitudes and serves as a benchmark for the analysis of information pooling agreements abstracting from strategic considerations i report two main results first a policy of nonexclusionary disclosure destroys the incentives to share information while exclusionary disclosure preserves them second information sharing increases expected total surplus with cournot competition but decreases it with bertrand competition in the context of a quadratic normal model with demand uncertainty

optimal gasoline tax in developing oil producing countries the case of mexico this paper uses the methodology of parry and small 2005 to estimate the optimal gasoline tax for a less developed oil producing country the relevance of the estimation relies on the differences between less developed countries ldcs and industrial countries we argue that lawless roads general subsidies on gasoline poor mass transportation systems older vehicle fleets and unregulated city growth make the tax rates in ldcs differ substantially from the rates in the developed world we find that the optimal gasoline tax is 1 90 per gallon at 2011 prices and show that the estimate differences are in line with the factors hypothesized in contrast to the existing literature on industrial countries we show that the relative gasoline tax incidence may be progressive in mexico and more generally in ldcs

the present value criterion and environmental taxation the suboptimality of first best decision rules this paper examines the links between environmental taxes and distortionary taxation in a dynamic model of climate change and economic growth under first best conditions labor and capital would remain untaxed and carbon dioxide emissions would be taxed at a rate equal to the present value marginal cost they impose on future society setting the discount rate equal to the marginal productivity of capital under secondbest conditions however this decision rule substantially understates optimal emissions taxes when the resulting revenues are used to provide targeted cuts in distortionary taxes conversely relatively low emissions taxes are economically justified given lump sum revenue recycling

free entry and social inefficiency our goal is to provide a simple yet general exposition of the conditions under which the number of entrants in a free entry equilibrium is excessive insufficient or optimal our analysis compares the number of firms that enter a market when there is free entry with the number that would be desired by a social planner who is unable to control the behavior of firms once they are in the market that is we consider the second best problem of choosing the welfare maximizing number of firms while we take as given their noncompetitive behavior after entry we demonstrate that the crucial conditions for establishing the presence of an entry bias can be stated quite simply in terms of the outcome of the postentry game played by entrants in contrast to previous work we do not need to model this postentry game explicitly

a monopolistic market for information abstract we analyze a model where traders buy information from a monopolistic seller which is subsequently used in a speculative market in order to overcome the dilution in the value of information due to its leakage through informative prices the seller of information may prefer to sell noisier versions of the information he actually has moreover to obtain higher profits it is desirable for the seller to sell different signals to different traders so that the added noise realizations do not affect equilibrium prices one way of doing so which does not require discrimination is to sell identically distributed personalized signals to each of a large number of traders

optimal differentiation of international environmental taxes in the presence of national labor market distortions we explore the implication of the doubledividend debate for international environmentaltaxes in our scenario small open economies withdifferent labor market distortions follow a commonenvironmental policy and use national environmentaltax revenues to finance labor tax cuts since thedouble dividend hypothesis does not hold a high labortax implies a low environmental tax relative to othercountries the optimal differentiation ofinternational environmental taxes is proven to be afunction of the national labor tax rates and theuncompensated elasticities of labor supply

choosing the right instrument the role of public revenues for environmental policy this paper analyses the optimal choice of second best optimal environmental policies using a partial equilibrium model the paper first reconfirms the well known result that the existence of a double dividend in its weak definition favours environmental policy instruments which maximise tax revenues for a given improvement in environmental quality additional revenues can be used to reduce the distortion of existing taxes such as taxes on labour and capital income without uncertainty environmental taxes and auctioned permits are equally appropriate in the presence of uncertainty however the optimal choice of taxes or tradable permits depends on the relative magnitudes of the marginal environmental damage and the marginal benefit from consuming a polluting good in the second part the paper therefore analyses how the revenue capacity affects the optimal choice of environmental policy instruments in the presence of uncertainty the paper shows that the first best choice rule between price and quantity regulation weitzman 1974 remains valid in a second best world with distortionary taxation

markets for information of inefficient firewalls and efficient monopolies in this paper we study market environments where information is costly to acquire and is also useful to potential competitors agents may sell or buy reports over the information acquired and choose their trades in the market on the basis of what they learnt reports are unverifiable cheap talk messages hence the quality of the information transmitted depends on the conflicts of interest faced by the senders we find that when information has a prevalent horizontal differentiation component in equilibrium information is acquired when its costs are not too high and in that case it is also sold though reports are typically noisy the market for information is in most cases a monopoly and there is underinvestment in information acquisition we also show that regulatory interventions in the form of firewalls only make the inefficiency worse efficiency can be attained with a monopolist selling differentiated information provided entry is blocked

direct and indirect sale of information the authors compare two methods for a monopolist to sell information to traders in a financial market in a direct sale information buyers observe versions of the seller s signal while in an indirect sale the seller sells shares in a portfolio based on his private information it is shown that when traders are identical and pricing is linear there is a trade off between optimal surplus extraction that is possible under direct sale and more effective control of the usage of information that is possible under indirect sale the optimal selling method depends on how much information is revealed by equilibrium prices copyright 1990 by the econometric society

estimation of a model of entry in the airline industry this paper considers the effect of an airline s scale of operation at an airport on the profitability of routes flown out of that airport the empirical methodology uses the entry decisions of airlines as indicators of underlying profitability the results extend the empirical literature on airport presence by providing a new set of estimates of the determinants of city pair profitability these estimates imply that city pair profits increase in airport presence and decrease rapidly in the number of entering firms the literature on empirical models of oligopoly entry is also extended via a focus on the role of differences between firms

energy taxation and the double dividend effect in taiwan s energy conservation policy an empirical study using a computable general equilibrium model abstract faced with pressure from greenhouse gas reductions and energy price hikes the taiwan government is in the process of developing an energy tax regime to reflect environmental external costs and effectively curb energy consumption as well as mitigate co2 emissions through an adequate pricing system this study utilizes a cge model to simulate and analyze the economic impacts of the draft energy tax bill and its complementary fiscal measures under the assumption of tax revenue neutrality the use of energy tax revenue generated for the purpose of reducing income tax is the best choice with double dividend effects since it will effectively stimulate domestic consumption and investment and consequently mitigate the negative impacts of the distortionary tax regime the double dividend effect is less significant however when the supplementary measures being used are for government expenditure nevertheless all supplementary measures have effectively reduced energy consumption which means they have delivered at least the first dividend in the sense of co2 emissions control it has been verified in this study that having adequate public finance policy measures is the key to realizing the double dividend effect

biofuel subsidies versus the gas tax the carrot or the stick abstract this paper provides an analytical framework to examine the relative efficiencies of a revenue neutral biofuel subsidy and a gas tax in the presence of pre existing distortions and growing substitutability between fuels both policies are set to achieve a targeted reduction in gasoline use at the state level the model is then calibrated for a small open economy such as illinois which is one of the largest producers of biofuels such as ethanol in the u s the main result of the paper shows that raising the biofuel subsidy use reduces overall welfare by more than a higher gas tax both aimed to achieve a targeted reduction in pure gasoline the relative efficiency of the higher gas tax is primarily due to it exacerbating the pre existing distortion in the biofuel market by less than the subsidy moreover for current parameter estimates welfare improving policy combinations for achieving a targeted amount of energy security are higher gas taxes combined with lower biofuel subsidies and a lower tax on income however the preference for a gasoline labor tax swap shrinks as the elasticity of substitution between the two fuels rises

environmental levies and distortionary taxation pigou taxation and pollution i note an important distinction between the optimal price of environmental quality in a second best world and the optimal level of environmental quality using an analytical general equilibrium model i show that for reasonable parameter values an increase in tax distortions arising from an increase in required tax revenues leads to a fall in the optimal pigouvian tax rate even while environmental quality improves in general knowledge of the direction of changes in optimal environmental tax rates due to changes in the economy is not sufficient for understanding the impact on environmental quality 2003 elsevier science b v all rights reserved

job contact networks abstract many workers hear about or obtain their jobs through friends and relatives the aim of this paper is twofold first we relate both individual and aggregate labor market outcomes to the network structure of personal contacts second we study strategic network formation to this purpose we develop a model specifying at the individual level both the decision to form contacts with other agents and the process by which information about jobs is obtained and transmitted we show that equilibrium networks always exist and that only moderate levels of network asymmetry can be sustained at equilibrium also we establish a general non monotonicity result on information flow and unemployment with respect to network size in symmetric networks

optimal control of externalities in the presence of income taxation optimal control of externalities a substantial literature examines second best environmental policy focusing particularly on how the pigouvian directive that marginal taxes should equal marginal external harms needs to be modified in light of the preexisting distortion due to labor income taxation additional literature is motivated by the possibility that distributive concerns should amend the internalization prescription it is demonstrated however that simple first best rules unmodified for labor supply distortion or distribution are correct in a natural basic formulation of the problem specifically setting all commodity taxes equal to marginal harms and subsidies equal to marginal benefits can generate a pareto improvement likewise a marginal reform in the direction of the first best can yield a pareto improvement for other reforms a simple efficiency test characterizing when a pareto improvement is possible is offered qualifications and explanations for the substantial departure from results in previous work are also elaborated

optimal dynamic carbon taxes in a climate economy model with distortionary fiscal policy how should carbon be taxed as a part of fiscal policy the literature on optimal carbon pricing often abstracts from other taxes however when governments raise revenues with distortionary taxes carbon levies have fiscal impacts while they raise revenues directly they may shrink the bases of other taxes e g by decreasing employment this article theoretically characterizes and then quantifies optimal carbon taxes in a dynamic general equilibrium climate economy model with distortionary fiscal policy first this article establishes a novel theoretical relationship between the optimal taxation of carbon and of capital income this link arises because carbon emissions destroy natural capital they accumulate in the atmosphere and decrease future output consequently this article shows how the standard logic against capital income taxes extends to distortions on environmental capital investments second this article characterizes optimal climate policy in sub optimal fiscal settings where income taxes are constrained to remain at their observed levels third this article presents a detailed calibration that builds on the seminal dice approach but adds features essential for a setting with distortionary taxes such as a differentiation between climate change production impacts e g on agriculture and direct utility impacts e g on biodiversity existence value the central quantitative finding is that optimal carbon tax schedules are 8 24 lower when there are distortionary taxes compared to the setting with lump sum taxes considered in the literature

energy taxes in the netherlands what are the dividends in this paper the environmental and economic effects of the introduction of a unilateral energy tax in the netherlands are analysed using an applied general equilibrium age model the effects of a small user energy tax and a general energy tax are compared while taking into account different tax recycling mechanisms the model contains a great level of detail with respect to emissions and environmental indicators greenhouse effect acidification eutrophication and waste which is helpful for assessing environmental quality the results show that the introduction of a small environmental tax reform not only improves the environment but also raises non environmental welfare which is due to an improvement of the efficiency of the tax structure

paternalism and tax competition when consumers make mistakes the government may wish to use paternalistic taxation as a corrective measure we analyse the extent to which tax competition undermines the feasibility of paternalistic taxation we show that the paternalistic component of a tax on a harmful good is reduced when there is cross border shopping but it does not disappear altogether in a model with tax competition between two countries only one of which has a paternalistic objective we show that a minimum tax rate requirement can be pareto improving despite the divergence in policy objectives tax harmonization however reduces welfare in the non paternalistic country

on the strategic choice of spatial price policy the strategic incentives with respect to the choice of price policy in spatial competition are analyzed in a duopoly model price discrimination emerges as the unique equilibriu m outcome in games with either simultaneous choice of policy and pric e or sequential choice where firms may commit first to uniform mill p ricing before the actual market stage nevertheless profits may be h igher with uniform pricing the authors models are applied to analyz e some common business practices that arise in geographical pricing like the basing point system and in the pricing of varieties or opti ons from a base product in a product differentiation context copyright 1988 by american economic association

planes ships and taxes charging for international aviation and maritime emissions international aviation and maritime transport account for a significant and growing share of global carbon emissions yet they are not only excluded from the kyoto agreement and all current carbon pricing schemes but do not even pay fuel excises of the type standard for other transport activities moreover each sector benefits from preferential tax treatment failure to charge vat on international aviation and the application of tonnage tax regimes rather than the normal corporate tax in maritime this paper considers the design of fuel charges in these sectors to address these distortions and quantifies their impact on emissions revenue and welfare showing amongst other things that the gain from offsetting the pre existing tax distortions may be as significant as those from reducing emissions it shows too how compensation schemes can be designed to protect the poorest countries a key ingredient in the politics of the issue given the practical need for wide applicability of such charges the real challenge is to amass the degree of international cooperation required especially strong for maritime failure of which to some degree explains their current under taxation and unsurprisingly to decide who gets the money technically these charges should if anything be rather easy to implement michael keen ian parry and jon strand

conflict of interest and the credibility of underwriter analyst recommendations brokerage analysts frequently comment on and sometimes recommend companies that their firms have recently taken public we show that stocks that underwriter analysts recommend perform more poorly than buy recommendations by unaffiliated brokers prior to at the time of and subsequent to the recommendation date we conclude that the recommendations by underwriter analysts show significant evidence of bias we show also that the market does not recognize the full extent of this bias the results suggest a potential conflict of interest inherent in the different functions that investment bankers perform

conflicts of interest information provision and competition in the financial services industry abstract in some markets sellers have better information than buyers over which products best serve a buyer s needs depending on the market structure this may lead to conflicts of interest in the provision of information by sellers this paper studies this issue in the market for financial services the analysis presents a new model of competition between banks where price competition influences the ensuing incentives for truthful information revelation we also compare conflicts of interest in two different firm structures specialized banking and one stop banking

the effects of social networks on employment and inequality we develop a model where agents obtain information about job opportunities through an explicitly modeled network of social contacts we show that employment is positively correlated across time and agents moreover unemployment exhibits duration dependence the probability of obtaining a job decreases in the length of time that an agent has been unemployed finally we examine inequality between two groups if staying in the labor market is costly and one group starts with a worse employment status then that group s drop out rate will be higher and their employment prospects will be persistently below that of the other group

a note on optimal taxation in the presence of externalities abstract i consider the problem of optimal taxation with externalities in a general setup encompassing most of optimal taxation models found in the literature it is demonstrated that when direct taxation of externalities is possible optimal taxes can be expressed as the sum of the optimal pigouvian taxes and the optimal taxes in a related problem without externalities regardless of what other tax instruments are available this result generalizes the so called principle of targeting

on environmental taxation under uncertain environmental damage this paper addresses optimal taxation when therelationship between the consumption of a dirty good and the resulting environmentaldamage is uncertain and treated as a randomvariable by policy makers the main purpose isto analyze how increased uncertainty measuredas a mean preserving increase in the spread ofthis random variable affects the optimalcommodity tax on the dirty consumption good incase the only task of government is to correctthe environmental externality and if thepreferences are characterized by nondecreasingabsolute risk aversion we find that thecommodity tax on the dirty consumption goodincreases in response to additionaluncertainty if on the other hand thegovernment provides a public good and uses alump sum tax in addition to the commodity tax it is possible that the commodity tax decreasesas a response to additional uncertainty evenif the preferences are characterized bynondecreasing absolute risk aversion a similarresult emerges although for different reasons if the lump sum tax is replaced by a laborincome tax

using privileged information to manipulate markets insiders gurus and credibility access to private information is shown to generate both the incentives and the ability to manipulate asset markets through strategically distorted announcements the fact that privileged information is noisy interferes with the public s attempts to learn whether such announcements are honest it allows opportunistic individuals to manipulate prices repeatedly without ever being fully found out this leads us to extend sobel s 1985 model of strategic communication to the case of noisy private signals our results show that when truthfulness is not easily verifiable restrictions on trading by insiders may be needed to preserve the integrity of information embodied in prices

intergenerational effects of a green tax reform for a more sustainable social security system abstract green tax reforms are popular in some circles not only because of their direct effect on reducing pollution but also because their revenue capacity may allow to reduce other more distortionary taxes despite their potential benefits the political implementation of green tax reforms is not straightforward changes in environmental taxes have different intergenerational effects which need to be taken into account when considering their political support among a country s population in this paper we analyze the economic and intergenerational welfare effects of introducing a green tax reform to ameliorate the spanish social security system we consider two types of energy taxes an energy consumption tax and an energy input tax we find that both types of reforms are favored by young individuals but rejected by older generations the number of generations supporting the reform depends crucially on the disutility that individuals derive from pollution suggesting that an increase in environmental awareness may be needed for green tax reforms to be politically viable

comparing specific and ad valorem pigouvian taxes and output quotas when the production or use of a good creates an external cost an unregulated market produces a socially inefficient quantity of output one remedy for this inefficiency is to impose a pigouvian tax equal to the marginal external damage associated with the good in many circumstances privately optimizing agents facing a pigouvian tax make decisions that are consistent with the maximization of social welfare

co2 stabilization may be a no regrets policy restricting co2 emissions requires changing today s consumption pattern away from energy and emission intensive commodities towards cleaner goods the cost of stabilizing co2 emissions at the 1990 level by the year 2000 say as compared to a business as usual trend is estimated by several researchers to be on the order of 1 of gnp we will argue that the cost may be overestimated because of a too simple model describing the working of the economic system and the evaluation of welfare we demonstrate that by expanding a model to include the actual tax system and negative externalities the cost to present generations from restricting emissions by a co2 tax may be negative that is some reduction may actually correspond to a no regrets policy the reasons are inefficiencies in today s tax system and non optimal handling of negative externalities our analysis suggests that a co2 tax and reduced emissions will lessen such inefficiencies

competition of firms discriminatory pricing and location1 two costlessly mobile firms are to be located in a market region a subset of the plane the firms compete by setting locations and delivered price schedules to study this competitive stiuation an appropriate extensive form game is defined along with an appropri ate noncooperative solution concept existence and general properties of the equilibrium are demonstrated among the results are each firm increases its profit by locating so as to decrease total cost to both firms of serving the market firms will never locate coinciden tally if they have identical production costs and transport cost rates or if these are different and the firms are located in a circular market region having a uniform demand distribution this paper studies competition between two profit maximizing firms in space who are costlessly mobile and may discriminate in price we will allow the firms to set locations and delivered price schedules and we will be concerned with the existence and properties of equilibria in location and price starting with hotelling 9 the spatial competition literature has focused on location on bounded linear markets by two or more firms hotelling assumed identical firms that produced a single good with constant cost of production and considered consumers to be uniformly distributed and to have inelastic demand he also assumed that the consumers pay transport cost and purchase the good from the cheapest source hotelling claimed that a nash equilibrium in locations for the two firm market existed and yielded back to back locations at the center of the market many authors most recently d aspremont gabszewicz and thisse 2 have noted that an equilbrium in prices and location does not exist for hotelling s model however if the firms employ identical exogeneously specified prices hotelling s conclusions hold subsequent work by smithies 14 hartwick and hartwick 7 and eaton 3 claimed to show that a nash equi librium in f o b prices and locations can exist in markets with a uniform distribu tion of consumers each of whom have identical elastic demand functions for the two and three firm problems the work of d aspremont et al casts doubt on these conclusions without the adoption of restrictive conditions our work contrasts with these works and related research which has dealt with linear markets with uniform distributions of customers and with identical firms our work will involve markets that are subsets of the plane having nonuniform distributions of customers our firms will be allowed to be different that is have differences in production and transport costs however the fundamental difference in our approach is that our firms will set discriminatory prices and not price f o b in many ways our work will represent the discriminatory pricing

revisiting the cost of protectionism abstract most studies of the welfare impacts of trade policy have ignored interactions between these policies and pre existing distortions from the income tax this paper demonstrates that when these interactions are taken into account the potential gains or losses from tariffs import quotas or voluntary export restrictions are significantly magnified however as long as the trade barrier doesn t generate rents for domestic households the optimal level of the trade barrier is unchanged from the first best case trade policies which do increase domestic rents either in the form of quota rents or rents to fixed factors in production suffer an additional efficiency cost and the optimal policy in this case is less strict than in the first best case

optimal information disclosure in auctions and the handicap auction we analyze a situation where a monopolist is selling an indivisible good to risk neutral buyers who only have an estimate of their private valuations the seller can release without observing certain additional signals that affect the buyers valuations our main result is that in the expected revenue maximizing mechanism the seller makes available all the information that she can and her expected revenue is the same as it would be if she could observe the part of the information that is new to the buyers we also show that this mechanism can be implemented by what we call a handicap auction in interesting applications in the first round of this auction each buyer picks a price premium from a menu offered by the seller a smaller premium costs more then the seller releases the additional signals in the second round the buyers bid in a second price auction where the winner pays the sum of his premium and the second highest non negative bid in the case of a single buyer this mechanism simplifies to a menu of european call options