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Abstract:
Taking account of sinks credits as agreed in Bonn and Marrakech, this paper illustrates how market power could be exerted in the absence of the US ratification under Annex 1 emissions trading and explores the potential implications of the non-competitive supply behavior for the international market of tradable permits, compliance costs for the remaining Annex 1 countries to meet their revised Kyoto targets, and the environmental effectiveness. Our results show that the US withdrawal from the Kyoto Protocol has had by far the greatest impact on the environmental effectiveness of the Protocol. This would lead to no real emission reduction in all remaining Annex 1 regions. As the biggest single buyer on the permit market, the absence of US ratification would significantly reduce the demand for permits. Consequently, the price of permits under Annex 1 trading would drop to zero. While all remaining Kyoto-constrained Annex 1 countries would enjoy meeting their revised Kyoto targets at zero costs, seller countries with excess supply of hot air would lose all their revenues under perfect Annex 1 trading.

Given the former Soviet Union (FSU) and the Eastern European countries (EEC) as the dominant suppliers of emissions permits on the international market, it seems likely that they would exert market power to maximize their revenues from permit sales. Depending on how market power is exerted, our results show that the overall compliance costs of all remaining Annex 1 regions in the case of FSU cooperating with EEC could reach as much as two times that in the case of only FSU acting as a monopoly. But no matter how market power is exerted, all Kyoto-constrained Annex 1 regions are better off with emissions trading in terms of their compliance costs than with no trading at all. Moreover, curtailing permit supply by market power will cut the amount of hot air being emitted into the atmosphere by more than half and at the same time, increases Annex 1 domestic abatement efforts. Thus, the overall environmental effectiveness is increased, although it is much less under the market power scenarios examined than in the case of the ratification of all Annex 1 regions including the US. A Monte Carlo simulation supports the robustness of our quantitative findings.

Climate policy, emission trading, market power, marginal abatement costs, Kyoto Protocol, Monte Carlo simulation

Abstract:
Taking account of sinks credits as agreed in Bonn and Marrakech, this paper illustrates how market power could be exerted in the absence of the US ratification under Annex 1 trading and explores the potential implications of the non-competitive supply behavior for the international market of tradable permits, compliance costs for the remaining Annex 1 countries to meet their revised Kyoto targets, and the environmental effectiveness. Our results show that the US withdrawal from the Kyoto Protocol has had by far the greatest impact on the environmental effectiveness of the Protocol. This would lead to no real emission reduction in all remaining Annex 1 regions. As the biggest single buyer on the permit market, the absence of US ratification would significantly reduce the demand for permits. Consequently, the price of permits under Annex 1 trading would drop to zero. While all remaining Kyoto-constrained Annex 1 countries would enjoy meeting their revised Kyoto targets at zero costs, seller countries with excess supply of hot air would lose all their revenues under perfect Annex 1 trading.

Given the former Soviet Union (FSU) and the Eastern European countries (EEC) as the dominant suppliers of emissions permits on the international market, it seems likely that they would exert market power to maximize their revenues from permit sales. Depending on how market power is exerted, our results show that the overall compliance costs of all remaining Annex 1 regions in the case of FSU cooperating with EEC could reach as much as two times that in the case of only FSU acting as a monopoly. But no matter how market power is exerted, all Kyoto-constrained Annex 1 regions are better off with emissions trading in terms of their compliance costs than with no trading at all. Moreover, curtailing permit supply by market power will cut the amount of hot air being emitted into the atmosphere by more than half and at the same time, increases Annex 1 domestic abatement efforts. Thus, the overall environmental effectiveness is increased, although it is much less under the market power scenarios examined than in the case of the ratification of all Annex 1 regions including the US.

Climate policy, emission trading, market power, marginal abatement costs, Kyoto Protocol

Abstract:
This paper investigates the implications of U.S. withdrawal from the Kyoto Protocol on environmental effectiveness, economic efficiency, and the distribution of compliance costs for remaining Annex-B countries taking into consideration the monopoly power by the Former Soviet Union (FSU) on international emission permit markets. Based on a multi-region partial equilibrium framework of marginal carbon abatement cost curves, we find that U.S. withdrawal considerably alters the environmental and economic implications of FSU market power in permit trade. Under U.S. compliance, monopolistic permit by FSU has no impact on environmental effectiveness as compared to a competitive trading system. Aggregate emissions of Annex-B regions fall by 10% below business-as-usual emission levels. Excess costs of market power amount to 40% of total compliance costs under competitive permit markets. Under U.S. withdrawal, monopolistic permit supply on behalf of the Former Soviet Union will assure some environmental effects of the Kyoto Protocol, with aggregate Annex-B emissions (including U.S.) falling by 3% vis-a-vis the business-as-usual emission level. For competitive permit trade, environmental effectiveness would be reduced to zero since the U.S. withdrawal implies an excess supply of permits driving permit prices down to zero. Efficiency losses from monopoly behavior by FSU under U.S. withdrawal double total compliance costs compared to a competitive permit market system which achieves the same environmental target. Given FSU monopoly power, U.S. withdrawal provides some cost reduction to complying non-U.S. OECD countries because reduced overall permit demand drives down the permit price. On the other hand, FSU and its competitive fringe EEC must bear a larger decline in revenues from permit sales.

climate policy, emission trading, market power

Abstract:
This paper provides an overview of the treatment of technological change in economic models of environmental policy. Numerous economic modeling studies have confirmed the sensitivity of mid- and long-run climate change mitigation cost and benefit projections to assumptions about technology costs. In general, technical progress is considered to be a non-economic, exogenous variable in global climate change modeling. However, there is overwhelming evidence that technological change is not an exogenous variable but to an important degree endogenous, induced by needs and pressures. Hence, some environment-economy models treat technological change as endogenous, responding to socio-economic variables. Three main elements in models of technological innovation are: (i) corporate investment in research and development, (ii) spillovers from R&D, and (iii) technology learning, especially learning-by-doing. The incorporation of induced technological change in different types of environmental-economic models tends to reduce the costs of environmental policy, accelerates abatement and may lead to positive spillover and negative leakage.

Climate policy, exogenous technological change, induced technological change, environment-economy models

Abstract:
Sustainability Impact Assessment (SIA) of economic, environmental, and societal effects triggered by governmental policies has become a central requirement for policy design. The three dimensions of SIA are inherently intertwined and subject to trade-offs. Quantification of trade-offs for policy decision support requires numerical models in order to assess systematically the interference of complex interacting forces that affect economic performance, environmental quality, and societal conditions. This paper investigates the use of computable general equilibrium (CGE) models for measuring the impacts of policy interference on policy-relevant economic, environmental, and social (institutional) indicators.

We find that operational CGE models used for energy-economy-environment (E3) analyses have a good coverage of central economic indicators. Environmental indicators such as energy-related emissions with direct links to economic activities are widely covered, whereas indicators with complex natural science background such as water stress or biodiversity loss are hardly represented. Societal indicators stand out for very weak coverage, not at last because they are vaguely defined or incommensurable. Our analysis identifies prospects for future modeling in the field of integrated assessment that link standard E3-CGE-models to theme-specific complementary models with environmental and societal focus.

Computable general equilibrium modeling (CGE), sustainability impact assessment (SIA), sustainable development (SD)

Abstract:
Impure public goods represent an important group of goods. Almost every public good exerts not only effects which are public to all but also effects which are private to the producer of this good. What is often omitted in the analysis of impure public goods is the fact that - regularly - these private effects can also be generated independently of the public good. In our analysis we focus on the effects alternative technologies - independently generating the private effects of the public good - may have on the provision of impure public goods. After the investigation in an analytical impure public good model, we numerically simulate the effects of alternative technologies in a parameterized model for climate policy in Germany.

Impure public goods, climate policy, rationing

Abstract:
Implementation of an EU-wide emissions trading system by means of National Allocation Plans is at the core of European environmental policy agenda. Member States are faced with the problem of allocating their national emission budgets under the EU Burden Sharing Agreement between energy-intensive sectors that are eligible for international emissions trading and the remaining segments of their economies that will be subject to complementary domestic emission regulation. The country-specific segmentation of national emission budgets between trading sectors and non-trading sectors will determine the cost efficiency of the EU emissions trading system and the gains for each Member State vis-a-vis domestic abatement policies. We present an interactive simulation model where users can specify the design of National Allocation Plans for each EU Member State and then evaluate the induced economic effects. Our numerical framework is based on marginal abatement cost curves for (emissions) trading and non-trading sectors of the EU-15 economies. Illustrative simulations highlight the importance of a coordinated design of National Allocation Plans in order to avoid substantial excess costs of regulation and drastic burden shifting between nontrading and trading sectors.

Emissions trading, allowance allocation, National Allocation Plans

Abstract:
This paper studies the cost effectiveness of climate policy if there are technology externalities. For this purpose, we develop a forward-looking CGE model that captures empirical links between CO2 emissions associated with energy use, directed technical change and the economy. We find the cost-effective climate policy to include a combination of R&D subsidies and CO2 emission constraints, although R&D subsidies raise the shadow value of the CO2 constraint (i.e. CO2 price) because of a strong rebound effect from stimulating innovation. Furthermore, we find that CO2 constraints differentiated toward CO2-intensive sectors are more cost effective than constraints that generate uniform CO2 prices among sectors. Differentiated CO2 prices, through technical change and concomitant technology externalities, encourage growth in the non-CO2 intensive sectors and discourage growth in CO2-intensive sectors. Thus, it is cost effective to let the latter bear relatively more of the abatement burden. This result is robust to whether emission constraints, R&D subsidies or combinations of both are used to reduce CO2 emissions.

Directed Technical Change, Climate Policy, Computable General Equilibrium Model, R&D

Abstract:
Germany has committed itself to reducing its carbon emissions by 25 percent in 2005 as compared to 1990 emission levels. To achieve this goal, the government has recently launched an environmental tax reform which entails a continuous increase in energy taxes in conjunction with a revenue-neutral cut in non-wage labor costs. This policy is supposed to yield a double dividend, reducing both, the problem of global warming and high unemployment rates. In addition to domestic actions, international treaties on climate protection allow for the supplementary use of flexible instruments to exploit cheaper emission reduction possibilities elsewhere. One concrete option for Germany would be to enter joint implementation with developing countries such as India where Germany pays emission reduction abroad rather than meeting its reduction target solely by domestic action. In this paper, we investigate whether an environmental tax reform cum joint implementation (JI) provides employment and overall efficiency gains as compared to an environmental tax reform stand-alone (ETR). We address this question in the framework of a large-scale general equilibrium model for Germany and India where Germany may undertake joint implementation with the Indian electricity sector. Our main finding is that joint implementation offsets adverse effects of carbon emission constraints on the German economy. JI significantly lowers the level of carbon taxes and thus reduces the total costs of abatement as well as negative effects on labor demand. In addition, JI triggers direct investment demand for energy efficient power plants produced in Germany. This provides positive employment effects and additional income for Germany. For India, joint implementation equips its electricity industry with scarce capital goods leading to a more efficient power production with lower electricity prices for the economy and substantial welfare gains.

environmental tax reform, joint implementation, productivity gaps, energy efficiency improvement, computable general equilibrium modeling

Abstract:
The economic effects of environmental taxes depend on the market structure. Under imperfect competition with free entry and exit, environmental taxes have an impact on economies of scale by changing the number and size of firms. Whether economies of scale rise or fall in a particular industry depends on induced changes in the price elasticity of demand. Because export demand is more price elastic than domestic demand, the overall price elasticity rises (falls) as the industry gains (loses) in comparative advantage. We use a computable general equilibrium model for Germany to examine the effects of a unilaterally introduced carbon tax under both perfect and imperfect competition. Our key finding is that induced structural change in favor of the less energy intensive, more labor intensive industries is more pronounced under imperfect competition than under perfect competition. At the macroeconomic level, the total costs of environmental regulation under imperfect competition can be higher or lower than those under perfect competition depending on whether aggregate gains or losses in economies of scale across imperfectly competitive sectors prevail.

environmental taxation, imperfect competition, structural change

Abstract:
Despite of the apparent failure of the Kyoto Protocol with respect to environmental effectiveness, it has established a broad international mechanism that might be able to provide a global reduction of greenhouse gas emissions during a second commitment period. In this paper we investigate the likely future of post-Kyoto policies. Our primary objective is to identify policy-relevant abatement scenarios and to quantify the associated economic implications across major world regions. Based on a cross-impact analysis we first evaluate an expert poll to select the most likely post-Kyoto climate policy scenarios. We then use a computable general equilibrium model to assess the economic implications of these key scenarios. We find that post-Kyoto agreements are likely to cover only small reductions in global greenhouse gas emissions with abatement duties predominantly assigned to the industrialized countries while developing countries do not make any commitments, but can sell emission abatement to the industrialized world. Equity rules to allocate abatement duties are mainly based on the sovereignty principle or ability-to-pay. Global adjustment costs arising from post-Kyoto policies are very moderate but fuel exporting countries are likely to face quite considerable costs because of adverse terms-of-trade effects on fossil fuel markets.

climate policy, cross-impact analysis, computable general equilibrium modeling

Abstract:
In the absence of an international agreement on climate policy, unilateral carbon abatement creates two problems: It tends to have a detrimental effect on domestic competitiveness, and it leads to an increase in carbon emissions abroad (leakage). This paper analyses two policies that have recently been proposed to mitigate these problems: Border tax adjustments (BTA) and integrated emission trading (IET). The former policy levies a quantity-based, the latter an emission based duty on imports from non-abating countries. In a stylised two-country model we demonstrate that the policies address both problems. However, BTA protects domestic competitiveness more effectively, while IET achieves a greater reduction in foreign emissions. A computational general equilibrium analysis of the unilateral abatement policy adopted by the European Union confirms our theoretical insights for the sectors covered by the offsetting measures. However, the implications for the competitiveness of noncovered sectors are negative. These two effects constitute the central trade-off in the implementation of both policies.

Border Tax Adjustments, Climate Policy, Competitiveness, Emission Trading

Abstract:
International climate policy has assigned the leading role in emissions abatement to the industrialized countries while developing countries remain uncommitted to binding emission reduction targets. However, cooperation between the industrialized and the developing world through joint implementation of emission abatement promises substantial economic gains to both parties. In this context, the policy debate on joint implementation has addressed the question of how investment risks to project-based emission crediting between industrialized countries and developing countries affect the magnitude and distribution of such gains. In our quantitative analysis, we find that the incorporation of country-specific investment risks induces rather small changes vis-a-vis a situation where investment risks are neglected. Only if investors go for high safety of returns is there a distinct decline in the overall volume of emission crediting and the associated total economic benefits. While the welfare effects of risk incorporation for industrialized countries are unequivocally negative, the implications across developing countries are ambiguous. Whereas low-risk developing countries attract higher project volumes and benefit from higher effective prices per emission credit compared to a reference scenario without risk, the opposite applies to high-risk countries. Sensitivity analysis with respect to higher risk estimates show that shifts in the comparative advantage of emission abatement against high-risk countries may become dramatic as only very low-cost mitigation projects will be realized, driving down the country's benefits from emission crediting to the advantage of low-risk developing countries. This result is supported by empirical evidence on regional imbalances of activities implemented jointly under the pilot phase of the Kyoto Protocol.

investment risks, international climate policy

Abstract:
This paper studies energy bias in technical change. For this purpose, we develop a computable general equilibrium model that builds on endogenous growth models. The model explicitly captures links between energy, the rate and direction of technical change, and the economy. We derive the equilibrium determinants of biased technical change and show the importance of feedback in technical change, substitution possibilities between final goods, and general-equilibrium effects for the equilibrium bias. If the feedback effect is strong, or the substitution elasticity large, or both, our model tends to a corner solution in which only technologies are developed that are appropriate for production of non-energy intensive goods.

computable general-equilibrium models, endogenous technical change, energy, environment

Abstract:
Computable general equilibrium (CGE) modeling has provided a number of important insights about the interplay between environmental tax policy and the pre-existing tax system. In this paper, we emphasize that a labor market policy of recycling tax revenues from an environmental tax to lower employers' non-wage labor cost depends on how the costs of labor are modeled. We propose an approach which combines neoclassical substitutability and fixed factor proportions. Our concept implies a user cost of labor which consists of the market price of labor plus the costs of inputs associated with the employment of a worker. We present simulation results based on a CO2 tax and the recycling of its revenues to reduce the nonwage labor cost. One simulation is based on the market price of labor and the other on the user cost of labor. We found a double dividend under the first approach but not under the second one.

Market-based environmental policy, carbon taxes, double dividend, computable general equilibrium modeling

Abstract:
The Climate action and renewable energy package proposed by the European Commission in the beginning of 2008 suggests auctioning as basic principle for allocation for the upcoming third trading phase of the EU Emissions Trading Scheme that runs from 2013 to 2020. Overall, it is estimated that at least two third of the total quantity of allowances will be auctioned in 2013, to be increased to 100 % by 2020. In this paper, we emphasize the importance of a properly chosen auction design as the significantly higher auction share, compared to the past and current trading phase, is expected to yield a thin secondary market for CO2 allowances. We elaborate main criteria that a viable auction design is supposed to fulfil and propose a specific auction design for the third trading phase. The auction we recommend is a simultaneous dynamic uniform double auction.

climate policy, emissions trading, auction design

Abstract:
We investigate the importance of 'what'-flexibility on top of 'where'- and 'when'-flexibility for alternative emission control schemes that prescribe long-term temperature targets and eventually impose additional constraints on the rate of temperature change. We find that 'what'-flexibility substantially reduces the compliance costs under alternative emission control schemes. When comparing policies that simply involve long-term temperature targets against more stringent strategies that include additional constraints on the rate of temperature increase, it turns out that the latter involve huge additional costs. These costs may be interpreted as additional insurance payments if damages should not only dependent on absolute temperature change but also on the rate of temperature change.

Climate policy, integrated assessment, what-flexibility

Abstract:
We present a decomposition approach for integrated assessment modeling of climate policy based on a linear approximation of the climate system. Our objective is to demonstrate the usefulness of decomposition for integrated assessment models posed in a complementarity format. First, the complementarity formulation cum decomposition permits a precise representation of post-terminal damages thereby substantially reducing the model horizon required to produce an accurate approximation of the infinite-horizon equilibrium. Second, and central to the economic assessment of climate policies, the complementarity approach provides a means of incorporating second-best effects that are not easily represented in an optimization model.

integrated assessment, decomposition, terminal constraints, optimal taxation

Abstract:
The objective of our analysis is to find out whether an increase in working time without pay compensation can be considered an adequate policy to reduce unemployment. From the perspective of economic theory, the outcome is in general ambiguous: On the one hand, as the increase in working time raises labor productivity per employee, conditional demand for labor will increase (substitution effect) and conditional demand for intermediate inputs will decline. Since, on the other hand, workers do have a longer working time anyway, no positive effect on the number of persons employed can be expected. However, output of the manufacturing industry, and thus unconditional demand for labor, capital and intermediate goods, will increase (output effect). In order to sell the additional output, firms have to lower prices. Depending on the price elasticities, revenues and hence profits will change. We quantify the employment effects of an economy-wide increase in weekly normal hours in Germany on the basis of a CGE model using an input-output framework for all sectors of the economy. Our simulation results support the argument of the opponents of longer working time that not more jobs will be created. However, when we recycled the higher tax revenues from GDP growth to lower the contribution to social security, then we have been able to support the claim of the proponents that more jobs will be created.

Unemployment, labor market rigidities, longer working hours, computable general equilibrium modelling

Abstract:
Ambitious unilateral EU environmental policy has raised concerns about adverse competitiveness implications for European energy-intensive and export-oriented sectors. We analyze the economic and environmental implications of two different measures to address these concerns in the EU Emission Trading Scheme (EU ETS): border tax adjustments (BTA) and the Clean Development Mechanism (CDM). Numerical simulations with a computable general equilibrium model of the global economy demonstrate that alternative BTA regimes are suitable to alleviate adverse competiveness implications of unilateral European climate policy on energy-intensive and export-oriented industries. The regulatory protection of these industries via subsidies for EU exporters and tariffs for non-EU importers goes, however, at the expense of sectors which are excluded from the EU ETS. We show that the choice of alternative benchmarks (i.e. carbon intensities) for the level of BTA substantially affects these competitiveness implications. The simulations further indicate that limited access to low-cost emission abatement via the CDM in the EU ETS alleviates adverse competitiveness impacts to a comparable extent as the most ambitious BTA scheme. Increasing "where-flexibility" of emission abatement thus represents an attractive market-based alternative to the application of border tax adjustments in unilateral climate policy.

Emissions Trading, EU ETS, Competitiveness, Border tax adjustments, Clean Development Mechanism, CGE model

Abstract:
In this paper, we analyze oil price impacts on unemployment for Germany. Firstly, we survey theoretical and empirical literature on the oil-unemployment relationship and relate them to the German case. Secondly, we illustrate this issue within the framework of a vector autoregression (VAR) approach for Germany. For this purpose, we use three different specifications in order to adequately address the uncertainty related to the construction of an adequate oil variable. Using monthly data from 1973 to 2008, we show that oil price increases induce a rise in unemployment in the German labor market. Moreover, for a restricted sample period for post-unification Germany, we oppose claims that the oil to macroeconomy relationship has weakened since the 1980s. However, our results suggest that it has become more important to construct adequate measures of oil price variables.

oil price; unemployment; Germany

Abstract:
International climate policy has assigned the leading role in emissions abatement to the industrialized countries while developing countries remain uncommitted to binding emission reduction targets. However, cooperation between the industrialized and the developing world through joint implementation of emission abatement promises substantial economic gains to both parties. In this context, the policy debate on joint implementation has addressed the question of how investment risks to project-based emission crediting between industrialized countries and developing countries affect the magnitude and distribution of such gains. In our quantitative analysis, we find that the incorporation of country-specific investment risks induces rather small changes vis-à-vis a situation where investment risks are neglected. Only if investors go for high safety of returns is there a noticeable decline in the overall volume of emission crediting and the associated total economic benefits. While the welfare effects of risk incorporation for industrialized countries are unequivocally negative, the implications across developing countries are ambiguous. Whereas low-risk developing countries attract higher project volumes and benefit from higher effective prices per emission credit compared to a reference scenario without risk, the opposite applies to high-risk countries. The politically undesired shift in comparative advantage of emission abatement against high-risk, typically least-developed, countries may become larger if risk-averse investors perceive large differences in project-based risks across countries. In this case, only very cheap mitigation projects in high-risk countries will be realized, driving down the respective country's benefits from emission crediting to the advantage of low-risk developing countries.

Abstract:
We investigate the possible future of Post-Kyoto climate policies until 2020. Based on a cross-impact analysis, we first evaluate an expert poll to identify the most likely Post-Kyoto climate policy scenarios. We then use a computable general equilibrium model to assess the economic implications of these scenarios. We find that Post-Kyoto agreements will include only small reductions in global greenhouse gas emissions, with abatement duties predominantly assigned to the industrialized countries, while developing countries remain uncommitted, but can sell emission abatement to the industrialized world. Equity rules to allocate abatement duties are mainly based on sovereignty or ability-to-pay. Global adjustment costs to Post-Kyoto policies are very moderate, but regional costs to fuel exporting countries can be substantial because of distinct terms-of-trade effects on fossil fuel markets.

Abstract:
We discuss self-interested uses of equity arguments in international climate negotiations. Using unique data from a world-wide survey of agents involved in international climate policy, we show that the perceived support of different equity rules by countries or groups of countries may be explained by their economic costs. Despite being self-interested, equity arguments may be perceived as being used for different reasons, for example, out of fairness considerations or in order to facilitate negotiations. Consistent with experimental and behavioral studies on fairness perceptions, we find that individuals are more likely to state reasons with positive attributes if they evaluate their own region or regions that support the individual’s personally preferred equity rule. Negotiators perceive the use of equity by regions as less influenced by pressure from interest groups.

Institutional subscribers to the NBER working paper series, and residents of developing countries may download this paper without additional charge at www.nber.org.

Abstract:
Implementation of an EU-wide emissions trading system by means of National Allocation Plans is at the core of the European environmental policy agenda. EU Member States must allocate their national emission budgets under the EU Burden Sharing Agreement between energy-intensive sectors that are eligible for European emissions trading and the remaining segments of their economies that will be subject to complementary domestic emission regulation. We show that such hybrid emission regulation may lead to substantial excess costs compared to a comprehensive emissions trading system covering all segments of the economy. Furthermore, the hybrid system associated with the current design of National Allocation Plans is likely to discriminate against sectors that are not part of the emissions trading scheme. The interested reader can make use of a web-based interactive simulation model in order to specify and evaluate alternative settings of the EU emissions trading system.

Abstract:
Computable general equilibrium (CGE) modeling has provided a number of important insights about the interplay between environmental tax policy and the pre-existing tax system. In this paper, we emphasize that a labor market policy of recycling tax revenues from an environmental tax to lower employers' non-wage labor cost depends on how the costs of labor are modeled. We propose an approach, which combines neoclassical substitutability and fixed factor proportions. Our concept implies a user cost of labor which consists of the market price of labor plus the costs of inputs associated with the employment of a worker. We present simulation results based on a CO2 tax and the recycling of its revenues to reduce the non-wage labor cost. One simulation is based on the market price of labor and the other on the user cost of labor. We found a double dividend under the first approach but not under the second one.

market-based environmental policy, carbon taxes, double dividend, computable general equilibrium modeling