european schemes for promoting renewables in liberalised markets abstract the paper describes possibilities and problems for penetration of supply systems based on renewable energy sources in liberalised markets the analysis is based on recent development in eu with different models for support of installations based on renewable energy these include feed in models with guaranteed minimum tariffs tender models for different bands of technologies and green certificates trading models with obligatory consumer quota the paper describes the market situation in selected european countries including germany the uk holland and denmark an eu directive from september 2001 has postponed the decision on a possible harmonisation of promotional models until at least 2005 in order to obtain more practical experience with the different support schemes a critical evaluation is given in this paper of the different models with proposals for a balanced development between environmental and trading concerns it is argued that too much emphasis is presently given to the side of free trade at the expense of long range planning for a sustainable energy development

taxing capital not a bad idea after all we quantitatively characterize the optimal capital and labor income tax in an overlapping generations model with idiosyncratic uninsurable income shocks and permanent productivity difierences of households the optimal capital income tax rate is signiflcantly positive at 36 percent the optimal progressive labor income tax is roughly a at tax of 23 percent with a deduction of 7 200 relative to average household income of 42 000 the high optimal capital income tax is mainly driven by the life cycle structure of the model whereas the optimal progressivity of the labor income tax is attributable to the insurance and redistribution role of the tax system jel e62 h21 h24

optimal progressive labor income taxation and education subsidies when education decisions and intergenerational transfers are endogenous abstract we quantitatively characterize the optimal mix of progressive income taxes and education subsidies in a model with endogenous human capital formation borrowing constraints income risk and incomplete financial markets in addition to the distortions of labor supply progressive taxes weaken the incentives to acquire education the latter distortion can potentially be mitigated by an education subsidy we find that the welfare maximizing fiscal policy is indeed characterized by a substantially progressive labor income tax code and a positive subsidy for college education both the degree of tax progressivity and the education subsidy are larger than in the current us status quo

initiating a sustained diffusion of wind power the role of public private partnerships in spain the literature on policy approaches for the market support of renewable electricity is dominated by narrow conceptualizations of policy referring mostly to direct instruments for economic feasibility such approaches often led to unsatisfactory explanations of diffusion results this is the case of wind power diffusion in spain the success of which is typically credited to the feed in tariff instrument this paper offers an alternative explanatory account for wind power diffusion in spain it is argued that diffusion can be explained by a less obvious policy of stimulating investments by means of public private partnerships ppps the three legal frameworks for economic feasibility applicable up to 2004 harbored high economic risks although projects could have high profitability because of generous investment subsidies up to mid 1990s most investments were based on ppps to address the risk perceptions of early investors fully private partnerships now dominate investments though ppps have not disappeared next to winning investors confidence the ppp policy led to an investment culture whereby partnership investments dominate by 2000 95 7 of the installed wind capacity was owned by partnerships and only 4 3 by individual companies partnerships invest in larger projects have ambitious investment plans and these lead to a high diffusion tempo

efficient division of profits from complementary innovations abstract many products including microprocessors telecommunications devices computer software and on line auction services make use of multiple technologies each of which is essential to make or sell the product the owner of one technology benefits from the existence of complementary technologies we show that despite this externality the structure of payoffs that support efficient r d investment by duopolists racing to discover a single innovation generalizes to the structure that supports efficient investment for complementary innovations the paper also examines how alternative intellectual property regimes and legal institutions affect r d investment in complementary technologies the results have policy implications for the organization of r d the assessment of damages for patent infringement and allocations of value in patent pools

the surprising power of age dependent taxes this paper provides a new empirically driven application of the dynamic mirrleesian framework by studying a feasible and potentially powerful tax reform age dependent labour income taxation i show analytically how age dependence improves policy on both the intratemporal and intertemporal margins i use detailed numerical simulations calibrated with data from the u s panel study of income dynamics to generate robust policy implications age dependence 1 lowers marginal taxes on average and especially on high income young workers and 2 lowers average taxes on all young workers relative to older workers when private saving and borrowing are restricted finally i calculate and characterize the welfare gains from age dependence despite its simplicity age dependence generates a welfare gain equal to between 0 6 and 1 5 of aggregate annual consumption and it captures more than 60 of the gain from reform to the dynamic optimal policy the gains are due to substantial increases in both efficiency and equity when age dependence is restricted to be pareto improving the welfare gain is nearly as large

optimal taxation in life cycle economies abstract we use a very standard life cycle growth model in which individuals have a labor leisure choice in each period of their lives to prove that an optimizing government will almost always find it optimal to tax or subsidize interest income the intuition for our result is straightforward in a life cycle model the individual s optimal consumption work plan is almost never constant and an optimizing government almost always taxes consumption goods and labor earnings at different rates over an individual s lifetime one way to achieve this goal is to use capital and labor income taxes that vary with age if tax rates cannot be conditioned on age a nonzero tax on capital income is also optimal as it can imperfectly mimic age conditioned consumption and labor income tax rates journal of economic literature classification numbers e62 h21

insurance and taxation over the life cycle we consider a dynamic mirrlees economy in a life cycle context and study the optimal insurance arrangement individual productivity evolves as a markov process and is private information we use a first order approach in discrete and continuous time and obtain novel theoretical and numerical results our main contribution is a formula describing the dynamics for the labour income tax rate when productivity is an ar 1 our formula resembles an ar 1 with a trend where i the auto regressive coefficient equals that of productivity ii the trend term equals the covariance productivity with consumption growth divided by the frisch elasticity of labour and iii the innovations in the tax rate are the negative of consumption growth the last property implies a form of short run regressivity our simulations illustrate these results and deliver some novel insights the average labour tax rises from 0 to 37 over 40 years whereas the average tax on savings falls from 12 to 0 at retirement we compare the second best solution to simple history independent tax systems calibrated to mimic these average tax rates we find that age dependent taxes capture a sizable fraction of the welfare gains in this way our theoretical results provide insights into simple tax systems copyright 2013 oxford university press

green electricity market development lessons from europe and the us this study compares the development and implementation of green electricity policies in germany the netherlands sweden and the united states a set of countries applying a range of policy instruments to encourage electricity from renewable energy sources a general tendency is identified that policies shift emphasis from r d stimulation towards dissemination and market application of renewable energy technologies we argue that in light of the long term nature of policy goals on energy security mitigation of climate change and environmental protection the applied range of policy instruments may be lacking in providing incentives for the long term development of new technologies clarifying policy objectives would allow careful selection of policy instruments including support for r d improved capacity building for policy implementation is also important

on the winner take all principle in innovation races what is the optimal allocation of prizes in an innovation race should the winner take all or is it preferable that the original inventor shares the market with subsequent independent duplicators some recent papers in law and economics have argued that the latter more permissive solution is socially preferable under mild conditions we re examine that issue arguing that a permissive regime may turn the innovation race into a waiting game reducing the power of incentives and may invite socially wasteful duplicative r d expenditures in a model that accounts for these effects the winner take all system turns out to be preferable in a broad set of circumstances especially in highly innovative industries jel k11 l1 o34

fixed feed in tariff versus premium a review of the current spanish system a b s t r a c t since 1998 the spanish government established a feed in system where res e generators could choose between two alternatives fixed feed in tariff and premium nowadays all res e 1 can be sold in the electricity market getting an additional premium except for solar photovoltaic one important novelty established in 2007 is a cap and floor system for facilities under the premium option the aim of this paper is to analyze and compare these two alternative options fixed fit and premiums which coexist at the same time in spain describe the evolution of both systems and evaluate its performance the introduction of this support system in spain led to very good results in terms of res e deployment the main advantage of the premium option is that it is a scheme integrated in the electricity market one disadvantage is that it can occasionally lead to overcompensation one way to try to avoid it is to set a cap value in order to evaluate the performance of this dual support system not only res e deployment has been assessed but also the policy stability the adequacy of res e production to the electricity demand pattern and the changes in the investors behaviour

redistributive taxation in a simple perfect foresight model abstract we investigate the redistributive potential of capital taxation in an intertemporal maximizing model of capital formation first even unanticipated redistributive capital taxation is severely limited in its effectiveness since it depresses wages second under any convergent redistributive tax policy which maximizes a paretian social objective the capital income tax will converge to zero independent of the factor supply elasticities these results are independent of workers holdings of capital

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

chinese investment in the eu renewable energy sector motives synergies and policy implications abstract this paper addresses three questions how have trade and investment in wind and solar sectors evolved between the eu and china in recent years is there a link between rising trade conflicts and trade and investment trends and what wider motivations and synergies can be identified in chinese investments in the eu s re sector to address these questions we analyze trade and investment data as well as qualitative data including information from media and company reports large increases in trade and investment were followed by rapid falls since 2012 13 trade tensions have not led to increases in investment rather the inverse we find that chinese investment in these two sectors is very concentrated in germany the key motivation for investment is market seeking although r d is also important especially for wind most investments are greenfield a preference that has persisted over time our qualitative analysis of several key acquisitions indicates that technology integration and the consolidation of capacities across the supply chain were key motivations in most of the cases studied we conclude with some policy orientations

compulsory licensing evidence from the trading with the enemy act compulsory licensing allows firms in developing countries to produce foreign owned inventions without the consent of foreign patent owners this paper uses an exogenous event of compulsory licensing after world war i under the trading with the enemy act to examine the effects of compulsory licensing on domestic invention difference indifferences analyses of nearly 130 000 chemical inventions suggest that compulsory licensing increased domestic invention by 20 percent jel d45 l24 n42 031 034 compulsory licensing allows firms in developing countries to produce foreign inventions without the consent of foreign patent owners 1 countries such as brazil thailand and india have used the policy to procure life saving drugs for millions of patients and are proposing it as a means to access foreign technologies to combat climate change 2 opponents of compulsory licensing however fear that the policy may reduce access to critical innovations that are invented abroad as it weakens incentives for foreign firms to transfer new technologies into developing countries for example the us pharmaceutical company merck criticized brazil s licensing of its hiv drug efavirenz as an expropriation of intellectual property which will hurt patients who require new life saving therapies http www ip watch org

insurance and opportunities a welfare analysis of labor market risk abstract using a model with constant relative risk aversion preferences endogenous labor supply and partial insurance against idiosyncratic wage risk this paper provides an analytical characterization of three welfare effects a the welfare effect of a rise in wage dispersion b the welfare gain from completing markets and c the welfare effect from eliminating risk the analysis reveals an important trade off for these welfare calculations on the one hand higher wage uncertainty increases the cost associated with missing insurance markets on the other hand greater wage dispersion presents opportunities to raise aggregate productivity by concentrating market work among more productive workers welfare effects can be expressed in terms of the underlying parameters defining preferences and wage risk or alternatively in terms of changes in observable second moments of the joint distribution over individual wages consumption and hours

optimal fiscal and monetary policy in an economy without capital abstract this paper is concerned with the structure and time consistency of optimal fiscal and monetary policy in an economy without capital in a dynamic context optimal taxation means distributing tax distortions over time in a welfare maximizing way for a barter economy our main finding is that with debt commitments of sufficiently rich maturity structure an optimal policy if one exists is time consistent in a monetary economy the idea of optimal taxation must be broadened to include an inflation tax and we find that time consistency does not carry over an optimal inflation tax requires commitment by rules in a sense that has no counterpart in the dynamic theory of ordinary excise taxes the reason time consistency fails in a monetary economy is that nominal assets should from a welfare maximizing point of view always be taxed away via an immediate inflation in a kind of capital levy this emerges as a new possibility when money is introduced into an economy without capital

determining the motives for a positive optimal tax on capital previous literature demonstrates that in a computational life cycle model the optimal tax on capital is positive and large given the computational complexities of these overlapping generations models it is helpful to to determine the relative importance of the economic factors driving this result i highlight the impact of changing two common assumptions in a benchmark model that generates a large optimal tax on capital similar to the model in conesa et al 2009 first the utility function is altered such that it implies an agent s frisch labor supply elasticity is constant as opposed to increasing over his lifetime second the government is allowed to tax accidental bequests at a separate rate from ordinary capital income the main nding of this paper is that these two changes cause the optimal tax on capital to drop by almost half furthermore i nd that the welfare costs of adopting the high optimal tax on capital from the benchmark model in the model with the altered assumptions which calls for a lower tax on capital are equivalent to 0 35 percent of total lifetime consumption quantifying the impact of these assumptions in the benchmark model is important because the rst has limited empirical evidence and the second although included for tractability confounds a motive for taxing capital with a motive for taxing accidental bequests jel e62 h21

on the optimality of age dependent taxes and the progressive u s tax system abstract in life cycle economies where an individual s optimal consumption work plan is almost never constant the optimal marginal tax rates on capital and labor income vary with age conversely the progressivity imbedded in the u s tax code implies that marginal tax rates vary with age because tax rates vary with earnings and earnings vary with age using numerical simulations this paper shows that if the tax authority is prevented from conditioning tax rates on age some degree of progressivity is desirable as progressive taxation better imitates optimal age dependent taxes than an optimal age independent tax system this role for progressive taxation emanates from efficiency reasons and does not rely on any insurance nor re distribution arguments

post entry competition in the plain paper copier market this paper reviews events in the plain paper copier ppc market immediately after xerox s monopoly ended xerox s behavior and that of a flood of ppc entrants are viewed through the lens of recent advances in the theory of entry and entry deterrence the events of the early post entry period also cast some interesting light on the theory of technological competition the modern theory of entry deterrence rests on a simple if not obvious proposition the socially worst industry performance is after entry the more monopolies there will be since the interests of the entrant and society are opposed once entry has occurred a series of papers have considered endogenous changes in the conditions of competition monopolists who make their industry more competitive conditional on entry in order to deter potential entrants there are two distinct steps in the entry deterrence argument first it must be possible for events during the monopoly period to affect postentry competition some intertemporal complication must be present either in costs or in firm specific demand if the state of the industry at the time of entry is to form important initial conditions for competition second the monopolist must find it profitable to manipulate the initial conditions by some pre entry action the general theoretical questions of entry and deterrence have been cast in quite specific terms for the problem of technological competition one view emphasizes the arrow effect kenneth arrow 1962 jennifer reinganum 1983 drew fudenberg and jean tirole because any innovation destroys some of the rents to older products and processes incumbent monopolists have a smaller incentive to innovate than potential entrants another view richard schmalensee 1983 richard gilbert and david newbery 1982 points out that the incumbent s losses from entrant s innovation create a motive for preemptive r d product introduction or patenting if incumbents are leaders and entrants followers the second view will hold independent of technology note that the difference is over the profitability of entry deterring strategies in both views the presence of valuable assets like patents or secrets provides the necessary intertemporal link events in the ppc market during the time of xerox s monopoly did have a substantial impact on the nature of competition in the early postentry period an arrow effect is evident as are other equilibrium explanations of xerox s rapid decline the alternative explanation that xerox was fat is also considered below

age dependent taxes with endogenous human capital formation we assess the gains attained by the introduction of age dependent labor income taxes in an overlapping generations economy where individuals live a meaningful life cycle and endogenously accumulate human capital the model is sufficiently rich to isolate the role of general equilibrium effects credit market imperfections and different forms of human capital accumulation the large welfare gains we obtain cannot be attained without age dependence nor can they be attained with age dependent taxes if progressivity of labor income taxes and capital income tax rates are not suitably adjusted to profit from the complementarity of these instruments

how strong are weak patents economists usually conceive of patents as property rights that prevent others from practicing the patenting technology unless they first obtain a license from the patent holder even for ironclad patents i e for patents that are certain to be valid the existing literature has shown that the analysis of equilibrium licensing contracts is surprising subtle and complex 1 for example the analysis is quite different depending upon whether one firm s licensing contract is observable to the other firms likewise equilibrium outcomes are quite different if royalties must be linear than in the case where two part tariffs and other non linear royalties are permitted in that literature a downstream firm that refuses to sign a contract with the upstream supplier either exits the industry in the case that the upstream supplier controls an essential input or must rely on more costly inputs in the case of a non essential input in other words the downstream firm s threat point is to use some backstop technology in practice however patents are issued after a brief examination by the patent office to see if they meet the statutory requirements for novelty and non obviousness mounting evidence indicates that many weak patents i e patents unlikely to be found valid if challenged in court are issued by the u s patent and trademark office uspto 2 some observers view this with great alarm arguing that uspto is handing out undeserved monopolies others by contrast have suggested that these weak patents are of little concern because they will have little commercial impact because they will be licensed at commensurately low royalty rates or not enforced at all we study the commercial impact of weak patents more precisely we define a patent s strength as the probability that it will be found valid if challenged in court and we examine the relationship between a patent s strength and the royalties that it can command the distinctive

harmonization of renewable electricity feed in laws a comment abstract this comment aims at critically analyzing some of the economic efficiency issues that are raised in the paper by munoz et al 2007 harmonization of renewable electricity feed in laws in the european union energy policy 35 3104 3114 on the harmonization of feed in law schemes for renewable electricity in the european union we comment on the choice between green certificate systems and feed in laws but pay particular attention to the implementation and design of a harmonized feed in law scheme in the comment we argue first that the approach suggested by munoz et al tends to downplay many of the practical difficulties in assessing the real costs facing investors in renewable electricity not the least since the presence of regulatory uncertainty about the marginal costs of renewable electricity may be essential for the choice between different support systems concerning the benefit side of renewable electricity promotion the munoz et al 2007 paper builds on an interpretation of the eu renewables directive that provides plenty of room for national priorities and that therefore essentially implies that harmonized support premiums per se are of little value we argue instead that a harmonized system should primarily address the international spillover effects from renewable electricity promotion not the least those related to improved security of supply in europe there exists then a strong case for disregarding the specific national benefits of renewable electricity production in the design of harmonized support systems and for instead considering international perhaps at the start bilateral policy support coordination based on entirely uniform support levels

a world without intellectual property a review of michele boldrin and david levine s against intellectual monopoly in their recent book against intellectual monopoly michele boldrin and david levine conclude that patents and copyrights are not necessary to provide protection for either innovation or creative expression and should be eliminated the authors note the many flaws of the u s system of intellectual property protection and argue that other means are available to appropriate the benefits of invention and creative expression while the authors overlook important functions of intellectual property they provide support for further reforms of intellectual property law jel k11 o31 o34

planning siting and the local acceptance of wind power some lessons from the french case abstract after some years of trifling development under a system of public tenders 1995 2000 french politicians progressively changed the national policy framework for feed in tariffs december 2000 and wind power development zones july 2005 the new policy framework has triggered a beginning of takeoff in wind power capacity the paper examines french wind power development in the light of two key dimensions and concepts related to wind power policy planning and siting part 1 we particularly focus on the recent french legislative debate which led to the adoption of the new policy framework part 2 the french case shows that the recourse to planning tools was not tailor made for siting issues but resulted from a political fight over the decentralization of energy policy the policy outcome which we call flexible decentralized planning is both interesting and ambiguous it is interesting in that it develops interfaces between planning tools and siting institutions it is ambiguous in that it is potentially very hierarchical the final decision power is left in state planners hands making it unpredictable the extent to which room will genuinely be provided for siting processes to take place

optimal taxation and human capital policies over the life cycle this paper derives optimal income tax and human capital policies in a life cycle model with risky human capital the government faces asymmetric information regarding agents ability its evolution and labor supply when the wage elasticity with respect to ability is increasing in human capital the optimal subsidy involves less than full deductibility of human capital expenses on the tax base and falls with age income contingent loans or a deferred deductibility scheme can implement the optimum numerical results suggest that full deductibility of expenses is close to optimal and that simple linear age dependent policies perform very well

optimal taxation of capital income in general equilibrium with infinite lives this paper analyzes the optimal tax on capital income in general equilibrium models of the second best agents have infinite lives and utility functions which are extensions from the koopmans form the population is heterogeneous the important property of the models is the equality between the social and the private discount rates in the long run i find that the optimal tax rate is zero in the long run for a special case of additively separable utility functions i then determine the tax rates along the dynamic path and conditions that are sufficient for the local stability of the steady state

use of economic instruments in the german renewable electricity policy this article surveys the economic instruments adopted in germany since the start of the previous decade and analyse the factors determining their effectiveness it is found out that their effect has always diminished in correspondence of increased uncertainty on the future of the system in particular while in two of these instances uncertainty was mainly due to national factors in the other the debate on the european renewable directive played a very important role recent changes in the production incentives have introduced a process simulating the effect of competition among renewable generators it is pointed out that the biennial revision of the rates can increase the uncertainty intrinsic in the policy on the other hand this process also provides a forum for the debate on the future of the renewable sector one can notice that currently germany the biggest renewable market in europe is granting one of the lowest production incentives this is rather curious as germany never relied on market competition in order to increase the renewable electricity production

examining the financial performance of micro generation wind projects and the subsidy effect of feed in tariffs for urban locations in the united kingdom abstract this paper seeks to evaluate the effect of the upcoming 2010 uk feed in tariff uk fit on decentralised small wind energy installations at the household and building level in urban locations it is projected that the uk fit will stimulate an unprecedented surge in building mounted turbine installation the tariff amount must stimulate incentive but mitigate the likelihood of distortions in the competitive electricity market to analyse these issues measured energy output from sites in the warwick wind trials project wwtp is converted into revenue in a net present value npv framework for assessing commercial purchases of small wind systems variances in project variables are examined through npv simulations using monte carlo analysis to capture permutations of small wind project performance in the uk with and without the uk fit our research concludes that the proposed tariff amount of 30 5 p kwh will not significantly boost the economic attractiveness of mildly selective wwtp based sites in the uk furthermore the fixed tariff rate kwh generated could cause inefficiencies applied across uneven wind resource distribution the results of this study suggest further examination of policy related to micro generation in particular decentralised small wind projects