optimal redistribution and monitoring of labor supply this paper extends the mirrlees 1971 model of optimal non linear income taxation with a monitoring technology that allows the government to verify labor supply at a positive but non infinite cost we analyze the joint determination of the non linear monitoring and tax schedules and the conditions under which these can be implemented monitoring of labor supply reduces the distortions created by income taxation and raises optimal marginal tax rates possibly above 100 the optimal intensity of monitoring increases with the marginal tax rate and the labor supply elasticity our simulations demonstrate that monitoring strongly alleviates the trade off between equity and efficiency welfare gains of monitoring are around 2 8 of total output the optimal intensity of monitoring follows a u shaped pattern similar to that of optimal marginal tax rates our paper can explain why large welfare states optimally rely on work dependent tax credits active labor market policies benefit sanctions and work bonuses in welfare programs

why has u s inflation become harder to forecast we examine whether the u s rate of price inflation has become harder to forecast and to the extent that it has what changes in the inflation process have made it so the main finding is that the univariate inflation process is well described by an unobserved component trend cycle model with stochastic volatility or equivalently an integrated moving average process with time varying parameters this model explains a variety of recent univariate inflation forecasting puzzles and begins to explain some multivariate inflation forecasting puzzles as well

inflation and welfare in a monetary economy it is in everyone s private interest to try to get someone else to hold non interest bearing cash and reserves but someone has to hold it all so these efforts must simply cancel out all of us spend several hours per year in this effort and employ thousands of talented and highly trained people to help us these person hours are simply thrown away wasted on a task that should not have to be performed at all

border carbon adjustments based on avoided emissions addressing the challenge of its design abstract carbon pricing is an essential instrument to address climate change however international differences in carbon control policies may cause not only carbon leakage but also competitiveness disadvantages in this context border carbon adjustments are a promising tool for discouraging these problems but designing a real world border carbon adjustment instrument implies to consider significant issues technical feasibility data availability the risk of retaliation from developing countries and its compatibility within the world trade organization legal framework there are still no conclusive answers about a proper design this paper is an attempt to address the above mentioned challenges proposing a carbon border tax cbt based on avoided emissions such a cbt is applied at a product level and not at a sector level and all international prices are deflated to guarantee that import like goods received a treatment similar to like domestic products using the wiod we simulate a cbt based on avoided emissions applied by the european union and we compare the results with a cbt based on embodied emissions

the friedman rule in an overlapping generations model with nonlinear taxation and income misreporting this paper models a two period overlapping generations economy with money populated with individuals of different skills they face a nonlinear income tax schedule and can engage in tax evasion money serves two purposes the traditional one modeled through a money in the utility function it also facilitates tax evasion the main message of the paper is that income tax evasion in this framework leads to the violation of the friedman rule the paper also shows that even in the absence of tax evasion when optimality requires differential commodity taxation complementarity of real cash balances and labor supply does not guarantee the optimality of the friedman rule as a boundary solution an additional assumption is required

self selection and pareto efficient taxation abstract this paper analyses the set of pareto efficient tax structures the formulation of the problem as one of self selection not only shows more clearly the similarity between this problem and a number of other problems such as the optimal pricing of a monopolist which have recently been the subject of extensive research but also allows the derivation of a number of new results we establish i under fairly weak conditions randomization of tax structures is desirable ii if different individuals are not perfect substitutes for one another in production then the general equilibrium effects until now largely ignored in the literature of changes in the tax structure may be dominant in determining the optimal tax structure in particular if the relative wage of high ability and low ability individuals depends on the relative supplies of labor the optimal tax structure entails a negative marginal tax rate on the high ability individuals and a positive marginal tax rate on the low ability individuals the marnitude of which depends on the elasticity of substitution iii if individuals differ in their preferences pareto efficient taxation may entail negative marginal tax rates for high incomes while iv if wage income is stochastic the marginal tax rate at the upper end may be 100 our analysis thus makes clear that the main qualitative properties of the optimal tax structure to which earlier studies called attention are not robust to these attempts to make the theory more realistic

european emission trading scheme and competitiveness a case study on the iron and steel industry abstract we quantify the impact of the european emission trading scheme ets on the two dimensions of competitiveness production and profitability for the iron and steel industry among those covered by the scheme this sector is one of the most exposed since it is both highly co 2 intensive and relatively open to international trade we also examine the robustness of these results to various assumptions marginal abatement cost curve trade and demand elasticities as well as pass through rates and updating of allocation rules of which the latter two are scarcely debated we conclude that for this sector competitiveness losses are small we prove this conclusion to be robust hence arguments against tightening the environmental stringency of the ets in phase ii are not justified on grounds of competitiveness loss our systematic sensitivity analysis allows us to identify the important assumptions for each output variable it turns out that pass through rates and updating rules are significant despite being often implicit and least debated in existing analyses

another look at long run money demand abstract this paper investigates the long run demand for m1 in the postwar united states previous studies based on data ending in the late 1980s are inconclusive about the parameters of postwar money demand this paper obtains precise estimates of these parameters by extending the data through 1996 the income elasticity of money demand is approximately 0 5 and the interest semi elasticity is approximately 0 05 these parameters are significantly smaller in absolute value than the corresponding parameters for the prewar period a caveat is that the analysis assumes there is no trend in money demand resulting from technological change

tax evasion and the optimum general income tax abstract this paper incorporates tax evasion into an optimum general income tax problem with endogenous labor supply it posits a two group model with high and low wage individuals to investigate the properties of optimal audit and tax structures the following main results are obtained first high wage persons are never audited while low wage persons are audited with a probability strictly less than one secondly high wage persons should face a zero marginal tax rate thirdly low wage individuals who have been audited and found innocent should pay a lower tax than those who are not audited fourthly there are two possible tax regimes low wage persons face a positive marginal tax rate under one regime and a zero rate under the other fifthly even if honesty cannot be rewarded the other results of the paper continue to hold

the implications of inflation in an estimated new keynesian model abstract this paper studies the steady state and dynamic consequences of inflation in an estimated dynamic stochastic general equilibrium model of the u s economy it is found that 10 percentage points of inflation entail a steady state welfare cost as high as 13 of annual consumption this large cost is mainly driven by staggered price contracts and price indexation the transition from high to low inflation inflicts a welfare loss equivalent to 0 53 of annual consumption the role of nominal real frictions as well as that of parameter uncertainty is also addressed

strategic tax competition implications of national ownership abstract two jurisdictions compete to capture the rents of a large multinational enterprise mne which invests locally and which is partly owned by local investors the mne contributes to local welfare by tax payments and dividends and it has private information about the efficiency of the operations in the two localisations it is shown that the distortions in the mne s real investment portfolio are determined by a trade off between fiscal externalities and equity externalities and that investments in the case of strategic tax competition may be lower than in the co operative case ownership matters and we show how the firm may reduce its overall tax payments by influencing the distribution of owner shares between investors in the two countries

money demand and the effects of fiscal policies this paper reexamines the choice of the scale variable in the money demand function a variety of evidence suggests that consumer spending is a better scale variable than gnp changing the money demand specification along these lines can profoundly affect the standard keynesian analysis of a tax cut copyright 1986 by ohio state university press

pareto efficient income taxation under costly monitoring abstract this paper studies the problem of pareto efficient fiscal policies when labour supply is elastic and the government has no a priori information on income earned the model is a two class economy with an official and an unofficial labour market official income is taxed non linearly while unofficial income is only observable after a costly audit upon which it is taxed at an exogenous penalty rate after characterisation of the pareto efficient audit and tax policies it is verified how these policies react to a higher government revenue requirement an increase in the penalty rate a stronger ambition to redistribute in the two last scenarios the effect on the marginal tax and the audit rate is shown to decompose into a government revenue effect and a substitution effect a numerical example shows that the substitution effects are of minor importance suggesting that first intuition about the best way for a government to cope with increased evasion opportunities substituting auditing effort for high marginal tax rates sketches only part of the picture

cost effective unilateral climate policy design size matters given the bleak prospects for a global agreement on mitigating climate change pressure for unilateral abatement is increasing a major challenge is emissions leakage border carbon adjustments and output based allocation of emissions allowances can increase effectiveness of unilateral action but introduce distortions of their own we assess antileakage measures as a function of abatement coalition size we first develop a partial equilibrium analytical framework to see how these instruments affect emissions within and outside the coalition we then employ a computable general equilibrium model of international trade and energy use to assess the strategies as the coalition grows we find that full border adjustments rank first in global cost effectiveness followed by import tariffs and output based rebates the differences across measures and their overall appeal decline as the abatement coalition grows in terms of cost the coalition countries prefer border carbon adjustments countries outside the coalition prefer output based rebates

market power and hot air in international emissions trading the impacts of us withdrawal from the kyoto protocol ten years after the initial climate change convention from rio in 1992 the industrialized world is finally likely to ratify the kyoto protocol which will impose legally binding greenhouse gas emission reductions on the developed world however the kyoto protocol will enter into force without the usa which withdrew under president bush in march 2001 accounting for hot air and market power of the former soviet union on emission permit markets it is shown that us withdrawal has important consequences on environmental effectiveness compliance costs and excess costs of market power under the kyoto protocol non compliance of the usa implies a dramatic decrease in environmental effectiveness as well as compliance costs of oecd countries whereas the former soviet union and transitional economies in eastern europe suffer from a huge decline in permit sales revenues excess costs of market power in permit trade increase in relative terms but decline substantially in absolute terms due to us withdrawal pol

plea bargaining with the irs extensions and further results abstract chu journal of public economics 41 1990 319 333 proposes a tax scheme called fatota under which taxpayers are given the choice between paying a fixed amount of taxes and thus being exempted from tax audit or paying only what taxpayers claim they owe and being subject to tax audits for possible evasion in this paper we extend chu s finding with regard to the pareto improving property of fatota to a more general setting including nonlinear tax penalty schedules complicated audit rules and endogenous labor supply we also show that any tax system in which the highest income taxpayer faces audit risk and or tax distortion can be pareto improved upon by the introduction of fatota we relate this result to seade s journal of public economics 7 1977 203 235 celebrated finding in the optimal taxation literature that any income tax schedule with a positive marginal tax rate at the top of the scale can be replaced by another tax schedule which is strictly pareto improving

optimal monetary policy under commitment with a zero bound on nominal interest rates we determine optimal monetary policy under commitment in a forwardlooking new keynesian model when nominal interest rates are bounded below by zero the lower bound represents an occasionally binding constraint that causes the model and optimal policy to be nonlinear a calibration to the u s economy suggests that policy should reduce nominal interest rates more aggressively than suggested by a model without lower bound rational agents anticipate the possibility of reaching the lower bound in the future and this amplifies the effects of adverse shocks well before the bound is reached while the empirical magnitude of u s mark up shocks seems too small to entail zero nominal interest rates shocks affecting the natural real interest rate plausibly lead to a binding lower bound under optimal policy however this occurs quite infrequently and does not imply positive average inflation rates in equilibrium interestingly the presence of binding real rate shocks alters the policy response to non binding markup shocks

is there a case for carbon based border tax adjustment an applied general equilibrium analysis concern that unilateral greenhouse gas ghg emission reductions could foster carbon leakage and undermine the international competitiveness of domestic industry has led to growing calls for carbon based border tax adjustments btas this article uses a global general equilibrium model to assess the economic effects of btas and comes to three main conclusions first btas can reduce carbon leakage if the coalition of countries taking action to reduce ghg emissions is small because in this case leakage while typically small mainly occurs through international trade competitiveness losses rather than through declines in world fossil fuel prices second even though the economic effects of btas vary somewhat depending on how they are implemented their welfare impact is typically small and slightly negative at the world level third and perhaps more strikingly btas do not necessarily curb the output losses incurred by the domestic energy intensive industries eiis they are intended to protect in the

on the welfare cost of inflation and the recent behavior of money demand post 1980 u s data trace out a stable long run money demand relationship of cagan s semi log form between the m1 income ratio and the nominal interest rate with an interest semi elasticity of 1 79 integrating under this money demand curve yields estimates of the welfare cost of modest departures from friedman s zero nominal interest rate rule for the optimum quantity of money that are quite small the results suggest that the federal reserve s current policy which generates low but still positive rates of inflation provides an adequate approximation in welfare terms to the alternative of moving all the way to the friedman rule jel e31 e41 e52

tax evasion with labour income allingham and sandmo s 1972 classic paper on tax evasion set out a simple framework for looking at the effects of regular tax parameters and of the structure of penalties on the amount of tax dodging carried out by a tax evader subsequent papers have enriched the basic model of individual behaviour and have attempted to adduce some empirical evidence 2 but with few exceptions the essential nature of the assumed underlying problem has remained the same how much income shall i reveal to the authorities in the face of the known penalties and the known possibility of getting caught whilst this approach is useful for some types of tax evasion by individuals it is clearly inappropriate for others such as the phenomenon of working off the books rather than concealing a portion of a uniform lump of income that is undistinguished as to its source the person cheats the government by taking one or more different jobs either in addition to or as a replacement for his regular employment the income from which is administratively difficult to tax this paper examines the implications of the possible diversity of form of the tax evasion problem for the analysis of the fundamental questions which allingham and sandmo addressed the effect of government instruments on the incentives to participate in legal and illegal work activities to do this we must concentrate on one major development of the original model namely that where income is endogenous in effect we construct a particular version of the analysis of labour supply under uncertainty within which to

alternative approaches for levelling carbon prices in a world with fragmented carbon markets abstract when carbon markets are fragmented and carbon prices vary across regions concerns arise that acting countries may encounter competitiveness and welfare losses and changes in production may lead to carbon leakage border carbon adjustments bcas have been proposed as a response measure to address these issues however more cooperative response policies such as linking carbon markets can also reduce the burden of emission reduction in acting countries and help level carbon prices this paper analyses the effects of bcas and both direct and indirect linking on welfare competitiveness and carbon leakage within a global recursive dynamic computable general equilibrium cge model results illustrate that an uneven carbon pricing can indeed lead to substantial competitiveness and welfare losses for acting countries as well as to carbon leakage of the instruments investigated in this paper bcas appear to be the best measure to preserve the competitiveness of acting countries as they shift part of the burden of emission reductions to non acting countries while bcas are effective for acting countries they cause severe welfare and competitiveness losses for non acting countries as a result bcas are less effective than linking in reducing global welfare losses as linking tends to be beneficial for both acting and non acting countries the advantages of bcas diminish as the carbon market is extended to more emission sources or to a wider international participation

five facts about prices a reevaluation of menu cost models are price decreases 3 the frequency of price increases covaries strongly with inflation whereas the frequency of price decreases and the size of price increases and price decreases do not 4 the frequency of price change is highly seasonal it is highest in the first quarter and then declines 5 we find no evidence of upwardsloping hazard functions of price changes for individual products we show that the first second and third facts are consistent with a benchmark menu cost model whereas the fourth and fifth facts are not

honesty and evasion in the tax compliance game conventional models of tax compliance emphasize that taxpayers make strategic tax reports underreporting income to the extent that this behavior is functionally rewarded in contrast to this view considerable empirical evidence suggests that many taxpayers are inherently honest reporting truthfully regardless of the incentive to cheat in this article we build a game theoretic model of tax compliance that includes both honest and potentially dishonest taxpayers we show that including honest taxpayers significantly alters the model leading to much improved empirical predictions and somewhat different and novel policy implications

the time varying volatility of macroeconomic fluctuations we investigate the sources of the important shifts in the volatility of us mac roeconomic variables in the postwar period to this end we propose the esti mation of dsge models allowing for time variation in the volatility of the structural innovations we apply our estimation strategy to a large scale model of the business cycle and find that shocks specific to the equilibrium condition of investment account for most of the sharp decline in volatility of the last two decades jel c51 e32

public provision of private goods self selection and income tax avoidance several contributions in the optimal taxation literature have emphasized that when individuals preferences are not separable between leisure and other goods it is desirable to supplement a nonlinear income tax with public provision of private goods moreover it has also been shown that the choice between a topping up and an opting out scheme depends on whether the publicly provided good is a complement or substitute with leisure with opting out topping up being the preferred scheme for goods which are substitutes complements for labor in this paper using the self selection approach to tax analysis we revisit these results in the presence of tax avoidance and investigate how public provision interacts withthe agents incentives to engage in tax avoidance three results are obtained first we show that tax dodging opportunities imply that non separability between labor and other goods is neither a necessary nor a sufficient condition to make public provision of private goods a welfare enhancing policy instrument second we show how tax dodging opportunities limit the scope for using topping up provision schemes as a redistributive device finally we show that for most of the public provision schemes previously analyzed in the literature being a welfare enhancing policy instrument goes hand in hand with weakening the agents incentives to shelter income from the tax authority however we also point out an important exceptionto this pattern

between a rock and a hard place a trade theory analysis of leakage under production and consumption based policies without a comprehensive global climate agreement carbon leakage remains a contentious issue consumption based pricing of emissions which could in practice be implemented with a full border tax adjustment bta has been forwarded as an option to increase the effectiveness of unilateral climate policy this paper questions the economic rationale behind this approach using a theoretical 2 times 2 trade model in which leakage occurs through terms of trade effects we show analytically first that consumption based pricing of emissions does not necessarily result in less leakage than production based policies second the sign of the optimal unilateral carbon tariff depends on the carbon intensity differential between the foreign country s exporting and non exporting sectors and not on the differential between home s and foreign s exporting sectors as implied by the full bta approach third based on empirical data for the year 2004 our model implies that full bta applied by the european union on e g imports from and exports to china would by shifting china s production from the export sector with a relatively low carbon intensity towards the more carbon intensive non export sector actually increase leakage

income tax compliance in a principal agent framework previous analyses have modeled income tax evasion as a portfolio problem deriving the optimal consumption of the risky asset unreported income under the assumption of a fixed probability of detection the purpose of this paper is to examine some of these issues in tax compliance starting from a different set of assumptions in particular we compare alternative audit policies to the standard random audit policy we focus on an audit cutoff policy in which an agent triggers an audit if his or her reported income is too low and is not audited if reported income is sufficiently high this paper establishes two major results first random audit rules are weakly dominated by audit cutoff rules it can be shown given lump sum taxes and fines that these audit cutoff rules are the least cost policies which induce truthful reporting of income second the dominance of audit cutoff rules over random audit rules holds for lump sum as well as proportional taxation in fact the equilibrium consequences of the two are equivalent

climate change policy market structure and carbon leakage abstract the 1997 kyoto protocol on climate change obliges the industrialized countries to initiate the international effort of abating anthropogenic greenhouse gas ghg emissions if such an initiative is to be taken the associated competitive effects may lead to significant relocation of developed countries energy intensive production this paper examines this issue i adopt an oligopolistic structure combined with increasing returns to scale production technologies to represent the strategic interaction among the firms producing energy intensive products this representation is then embedded within a multi regional computable general equilibrium model which in turn is used for quantifying these relocational effects the results suggest that significant relocation of energy intensive industries away from the oecd may occur depending on the type of market structure with leakage rates as high as 130 in which case ghg control policies in the industrialized countries actually lead to higher global emissions

assessing alternative solutions to carbon leakage abstract a modified version of the computable general equilibrium gtap e model is developed in order to assess the economic and carbon emission effects of alternative trade policy measures aimed at reducing carbon leakage we compare several unilateral policy measures implemented by countries subject to an emissions level cap results provide evidence of the scarce effectiveness of these policies in reducing the carbon leakage rate and conversely some of the trade measures that are discussed seem to be more consistent with the goal of protecting market shares of national firms in the domestic markets of abating countries assessing environmental and competitiveness outcomes jointly confirms that a global cooperative solution would be the most effective as well as an efficient policy option for reducing carbon leakage

tax evasion and financial development under asymmetric information in credit markets abstract recent empirical studies have documented that after controlling for variables related to state capacity the incidence of firms tax evasion on their sales is negatively correlated with the level of a country s financial development motivated by this stylized fact our paper takes state capacity as given and provides an alternative theory that is built upon asymmetric information in credit markets particularly within developing economies we analytically show that with a more developed financial sector that exhibits smaller agency costs the government of a rich small open economy country will raise its optimal tax auditing probability which in turn leads to more tax compliance our baseline model also yields an empirically realistic positive correlation between financial development and the ratio of tax revenue over gdp in an extended setting which allows for size dependent probabilities of tax detection we find that consistent with the empirical evidence large firms comply with taxes whereas small firms evade taxes

economic and environmental impact analysis of carbon tariffs on chinese exports as an alternative measure for the proposal of border tax adjustments btas advocated by the countries that seek to abate co2 emissions hereafter referred to as abating countries export carbon tax ect voluntarily conducted by the developing countries has been widely discussed in recent years this paper uses the multi regional and multi commodity computable general equilibrium cge model and the gtap8 1 database to investigate the economic and environmental effects of carbon tariffs on chinese exports the following three policy scenarios are considered 1 the abating countries implement cap and trade emission programs without btas 2 the unilaterally abating countries levy import tariffs and export subsidies on non abating countries and 3 the abating countries implement unilateral climate policies combined with ect imposed by china the ect policy of china is evaluated with a carbon price set at 17 us t co2 results illustrate that the ect voluntarily implemented by china is ineffective in reducing its domestic co2 emissions moreover ect merely has a minor impact on global emissions finally the competitiveness of china s energy intensive and trade exposed eite industries suffers substantial losses if export tariffs are imposed however china s gains in terms of welfare and gross domestic product gdp would be slightly improved if an ect policy is implemented compared to the scenario where china is subjected to btas levied by the abating coalition in the light of the tradeoff between tariff revenue for welfare and competiveness losses of the eite industries it is therefore difficult to conclude that carbon tariff on chinese exports is an alternative policy to btas

estimating carbon leakage and the efficiency of border adjustments in general equilibrium does sectoral aggregation matter abstract estimates of the carbon leakage resulting from sub global climate policies tend to be lower when using economy wide general equilibrium models than what technology specific and bottom up models suggest in order to test whether this difference is due to excessive sectoral aggregation i exploit disaggregated data and estimate unobserved values to create a dataset with rich industrial sector detail the bias caused by sectoral aggregation is estimated by calibrating a computable general equilibrium model to this dataset and comparing results with those generated from more aggregated data a stylized unilateral carbon pricing policy is simulated results show that aggregated calibrations overestimate industrial output loss and underestimate the increase in the co 2 embodied in imports the efficiency of border carbon adjustments at reducing leakage is also underestimated however i find that general equilibrium estimates of carbon prices and economy wide leakage rates are mostly unaffected by the degree of industrial aggregation

optimal tax mix with income tax non compliance abstract although developing countries face high levels of income inequality they rely more on consumption taxes which tend to be linear and are less effective for redistribution than a non linear income tax one explanation for this pattern is that the consumption taxes are generally more enforceable in these economies this paper studies the optimal combination of a linear consumption tax with a non linear income tax for redistributive purposes in our model households might not comply with the income tax code by reporting income levels that differ from their true income however the consumption tax is fully enforceable we derive a formula for the optimal income tax schedule as a function of the consumption tax rate the recoverable elasticities and the moments of the taxable income distribution our equation differs from those of mirrlees 1971 and saez 2001 because households face a consumption tax and they respond to income tax not only through labor supply but also through mis reporting their incomes both aspects are empirically relevant to our calibration of the optimal top rate in the russian economy we then characterize the optimal mix between a linear consumption tax rate and a non linear income tax schedule finally we find that the optimal consumption tax rate is non increasing in the redistributive motives of the social planner

income tax evasion labour supply and the equity efficiency tradeoff abstract this paper is an attempt to incorporate tax evasion into the analysis of optimum income taxation a model of variable labour supply with tax evasion is used to derive supply functions for labour in regular and irregular markets given taxpayer behaviour the government chooses tax rates penalties and the probability of detection to maximize a utilitarian social welfare function the results consist in the derivation of a formula for the optimum marginal tax rate and a characterization of the factors determining the choice between the penalty rate and the probability of detection as instruments for the control of tax evasion

money demand heterogeneity and the great moderation abstract a forward looking model of the demand for money based on heterogeneous and sluggish portfolio adjustment can simultaneously account for the low short run and high long run semi elasticities reported in the literature the parameter estimates from the model for the short run and long run interest semi elasticities are 1 04 and 13 16 respectively a simulated version of the model suggests that the great moderation can be partially attributed to financial innovations in the late 1970s when moving toward a more flexible portfolio the model can account for almost one third of the observed decline in the volatilities of output consumption and investment

income taxation and job market signaling abstract this paper develops a model of taxation with asymmetric information between the worker and the employer as well as between the worker and the tax collector we show that if the informational asymmetry in the labour market is solved through signaling implications for taxation are strong taxing the signal directly as well as imposing a progressive tax on income are both shown to have favourable welfare consequences locally in contrast to the results obtained for the progressive income tax we show that taxing the signal directly is likely to reduce other distortions the optimal tax fully exploits the possibilities to tax the signal directly before using progression

a look inwards carbon tariffs versus internal improvements in emissions trading systems abstract subglobal climate policies will be the norm for some years to come however several options exist for improving the efficiency of domestic emissions regulation a prominent but contentious policy option for improving the external efficiency is the implementation of carbon tariffs on non regulating regions this is thought to reduce carbon leakage and increase domestic production albeit at the cost of non regulating countries in contrast internal efficiency improvements can be more collaborative in type among others they include extending and linking of domestic emissions trading systems this study compares the relative economic impacts of those policy options if annex i countries would follow one or the other the study uses a computable general equilibrium model of the global world economy and develops a set of emissions trading and carbon tariff scenarios with various degrees of sectoral and regional coverage for a globally effective annex i emissions reduction target of 20 the results indicate that linking annex i countries domestic emissions trading systems and expanding their sectoral coverage could yield greater global welfare improvements than implementing carbon tariffs on energy intensive goods imported from non annex i countries while non annex i countries would be significantly better off without facing carbon tariffs on their exports annex i countries could gain from either policy the relative gains from linking and extending the sectoral coverage of domestic emissions trading systems are greater for early policy implementation within a large annex i coalition of climate regulating countries while late implementation within a small coalition would yield greater relative welfare gains from imposing carbon tariffs the results suggest that in addition to the political benefits there exists an economic rationale for substituting the external efficiency improvements associated with implementing carbon tariffs with internal ones associated with extending annex i countries emissions trading systems

on the fit of new keynesian models this article provides new tools for the evaluation of dynamic stochastic general equilibrium dsge models and applies them to a large scale new keynesian model we approximate the dsge model by a vector autoregression and then systematically relax the implied cross equation restrictions and document how the model fit changes we also compare the dsge model s impulse responses to structural shocks with those obtained after relaxing its restrictions we find that the degree of misspecification in this large scale dsge model is no longer so large as to prevent its use in day to day policy analysis yet is not small enough to be ignored

constrained efficient fine cum tax rate structures the case of constant relative risk aversion this paper explores the possibility that fines and tax rates impose different welfare costs on different types of taxpayer so that the government may want to apply different fine tax rate treatments to different types of taxpayer under the assumption that taxpayers exhibit constant relative risk aversion we characterize the constrained pareto efficient fine tax rate structure showing that i the co existence of compliers the above ground economy and evaders the underground economy is typical at the pareto optimum and ii pareto efficiency requires compliers to face tax rates no higher and fines no lower than those faced by evaders

samurai accountant a theory of auditing and plunder a risk neutral principal wishes to exact a payment from a risk neutral agent whose wealth he does not know but may verify through a costly auditing procedure we characterize efficient schemes for the principal when he is allowed to choose schedules for preaudit and postaudit payments and audit probabilities subject to the constraint that only monetary incentives can be used and that the principal may never make a net payment to the agent the main results are that efficient schemes involve preaudit payments which are increasing in the agent s wealth audit probabilities are decreasing in the agent s wealth and also satisfy certain constraints as equalities in general such schemes involve stochastic auditing and rebates after an audit in this paper we analyse the problem of a principal extracting wealth from an agent who is reluctant to part with it and is also better informed than the principal as to the amount he owns we assume that the principal has a costly means of discovering the agent s

the impacts of carbon pricing on coastal megacities a cge analysis of singapore abstract pricing carbon is a widely used policy instrument for climate change mitigation quantitative analysis of carbon pricing are mainly conducted at the regional and national level rarely at the city level due to data availability as a representative of coastal megacities that are vulnerable to both climate change and climate policies singapore has announced to impose carbon tax on large direct emitters as a complementary mitigation option to technical measures a city level computable general equilibrium cge model is developed to simulate potential impacts of carbon pricing on the city including paying border carbon adjustment bca on exports or introducing a domestic carbon tax different sector coverages and carbon tax revenue recycling schemes are investigated for domestic carbon tax the simulation results show that a domestic carbon tax is a more cost effective option than paying bca given an identical carbon price at s 10 t co 2 gdp total exports and household consumption would decline less and average abatement cost is much smaller in the carbon tax scenarios compared to the bca scenario in terms of absolute emissions reduction a carbon tax that covers energy manufacturing and land transport sectors would be preferred making emissions around 2 7 lower than 2010 baseline level