prices and quantities unsustainable consumption and the global economy abstract the ecological unsustainability of current consumption patterns is now well documented one aspect of this problem which has not been sufficiently addressed is the growth of excess consumption driven by falling goods prices the index of department store prices have fallen substantially since the early 1990s in large part because global capital mobility and excess global labor supply has allowed firms to depress wages and avoid paying environmental costs consumers have responded by purchasing increasing numbers of these artificially cheap goods the example of apparel is discussed in some detail and data from other goods categories are presented these trends suggest that achieving sustainable consumption in the us is not only a technical issue but will also involve fundamental changes in the global political economy to eliminate the artificially low prices of imported goods

sustainability as a fair bequest an evaluation challenge abstract in contrast to conventional approaches the conceptualisation of sustainability as fair bequest makes it possible to consider a finite time horizon valuation is necessary to determine whether the bequest package that is passed on from one generation to the next is fair acknowledging the merits as well as the limitations of economic price theory this paper differentiates between three classes of valuables the essential the useful and the unique it is argued that a fair bequest package should contain items from each of the classes because the three classes are incommensurable fairness of the bequest cannot be expressed by a single figure like a non declining total value of the package we then discuss which methods are appropriate for describing a bequest package with respect to its fairness

the structure of licensing contracts industrial organization theory has explored several issues related to licensing but empirical analyses are extremely rare we amass a new and detailed dataset on licensing contracts and use it to present some simple facts concerning licensing behavior our analysis reveals robust cross industries differences in several contractual features such as exclusivity cross licensing ex ante versus ex post technology transfers and licensing to related versus unrelated parties we offer an interpretation of these facts based on cross industry variation in the strength of intellectual property rights

monetary union price level convergence and inflation how close is europe to the usa abstract the pattern of price dispersion across european and us cities from 1990 to 2004 is documented there is a striking decline in dispersion for traded goods prices in europe most of which took place prior to the launch of the euro dispersion in the euro area is now quite close to that of the usa this evidence provides useful facts for future work assessing the importance of various developments in europe harmonization of tax rates convergence of incomes and labor costs liberalization of trade and factor markets and increased coherence of monetary policy

a note on national income in a dynamic economy abstract we review the properties of the static measure of changes in economic welfare national income in a dynamic economy it is possible to establish attractive welfare properties by rather simple arguments and this can be estimated from current data its welfare properties are preferable to those of net national product and comparable to those of the state valuation function

status effects and environmental externalities abstract this paper examines a static competitive economy where the production of a consumption good generates pollution that adversely affects human welfare preferences are defined over consumption leisure pollution and economic status each person s status increases with her own consumption but decreases with the average consumption of society the achievement of a pareto efficient resource allocation requires a consumption tax to offset the incentive to overconsume in the pursuit of enhanced status in contrast with standard prescriptions the efficient pollution tax generally exceeds the sum of individuals marginal willingness to pay for pollution abatement these findings remain unaltered when preferences are modified to incorporate altruistic concern for others well being altruism however suggests a potential role for government intervention to achieve a desirable i e pareto efficient distribution of welfare between individuals

tastes and technology in a two country model of the business cycle explaining international trade on international financial markets allows people to insure country specific risk and smooth consumption intertemporally equilibrium models of business cycles with trade on global financial markets typically yield international consumption correlations near one and excessive volatility of investment the authors incorporate nontraded goods in the model and find that the implications for aggregate consumption investment and the trade balance are consistent with business cycle properties of industrialized countries however the model driven by technology shocks alone yields counterfactual implications for comovements between consumption and prices at the sectoral level taste shocks produce price quantity relationships more consistent with the data copyright 1995 by american economic association

litigation and settlement in patent infringement cases a patent grants its owner the right to sue intruders that have been identified the patentholder must then supervise the market and react in case of infringement his reaction may be to go to court to settle or to accept entry we investigate how intensive the monitoring effort should be and how it will influence the entry decision in a simultaneous game even if the penalty paid by the infringer in case of a finding of liability is high the patentholder may prefer a settlement to a trial the likelihood of entry may increase with the penalty in sequential games regardless who plays first entry occurs comparatively less often than in the simultaneous game

environmental policy government and the market environmental policy is made in a context of both market failure and government failure on the one hand leaving environmental protection to the free market relying on notions of corporate social responsibility and altruistic consumer and shareholder preferences will not deliver optimal results on the other hand nationalizing the delivery of environmental protection is likely to fail because nation states rarely have the depth and quality of information required to instruct all the relevant agents to make appropriate decisions thus as for many areas of policy appropriate models of environmental intervention will lie between these two extremes while it is impossible to specify general rules concerning the precise form of intervention in part because the type of intervention depends upon value judgements this paper sets out some of the considerations that are particular to environmental policy and explores several principles for policy design including information coordination and principal agent problems with a particular focus on the international context

u s real exchange rate fluctuations and relative price fluctuations abstract traditional theory attributes fluctuations in real exchange rates to changes in the relative price of nontraded goods this paper studies the relation between the united states bilateral real exchange rate and the associated bilateral relative price of nontraded goods for five of its most important trade relationships we find that this relation depends crucially on the choice of price series used to measure relative prices and on the choice of trade partner the relation is stronger when we measure relative prices using producer prices rather than consumer prices the relation is stronger the more important is the trade relationship between the united states and a trade partner even in cases where there is a strong relation between the real exchange rate and the relative price of nontraded goods however a large fraction of real exchange rate fluctuations is due to deviations from the law of one price for traded goods

are positional concerns stronger in some domains than in others for more than one hundred years economists have discussed the concept of positional goods that the utility conferred by many perhaps even most goods depends not only on the amount the individual consumes but also on the amount others consume e g thorstein veblen 1899 james duesenberry 1949 john k galbraith 1958 robert frank 1985 while economic interest in positional goods is increasing e g mark pingle and mike mitchell 2002 kenneth arrow et al 2004 ed hopkins and tatiana kornienko 2004 the literature remains largely theoretical rather than empirical if status concerns affect all items in the utility function equally leisure as well as goods the positional effect would operate like a lump sum tax reducing well being without changing the allocation of time or money arrow et al 2004 however if positional concerns are stronger for some things than for others then in order to understand how people can become better off in well being not simply in wealth we must investigate how interpersonal competition interacts with material gains frank 1997 evidence about what goods are more positional than others is essential for correct policy recommendations gregory besharov 2002 but little is actually known about the relative positional rankings of items in the typical consumer s utility function four hypotheses proposed in the literature are

comparing new keynesian models of the business cycle a bayesian approach abstract the baseline new keynesian model cannot replicate the observed persistence in inflation output and real wages for sensible parameter values as a result several extensions have been suggested to improve its fit to the data we use a bayesian approach to estimate and compare the baseline sticky price model of calvo s 1983 staggered prices in a utility maximizing framework journal of monetary economics 12 383 398 and three extensions our empirical results are as follows first we find that adding price indexation improves the fit of calvo s 1983 staggered prices in a utility maximizing framework journal of monetary economics 12 383 398 model second models with both staggered price and wage setting dominate models with only price rigidities third introducing wage indexation does not significantly improve the fit fourth all model estimates suggest a high degree of price stickiness fifth the estimates of labor supply elasticity are higher in models with both staggered price and wage contracts finally the estimated inflation parameters of the taylor rule are stable across models

viable ramsey economies the ramsey model of economic growth is revisited from the perspective of viability theory the ramsey model augmented with minimal consumption and sustainability criteria becomes a viability problem the framework allows for a clear picture of optimal viable optimal non viable and viable non optimal paths the drastic sacrifices in terms of present consumption required by the implementation of brundtland sustainability are visualized the rich countries bearing the major part of the burden the econometric analysis of viability sets enhances the role of technological progress in ensuring brundtland sustainability preference parameters such as the pure time preference rate are statistically non significant

inflation differentials between spain and the emu a dsge perspective this paper estimates a dynamic stochastic general equilibrium model of a currency union with nominal rigidities to explain the sources of inflation differentials between the economic monetary union emu and one of its member countries spain the paper finds that productivity shocks account for 85 of the variability of the inflation differential demand shocks explain a large fraction of output growth volatility but not variability in inflation differentials in addition the estimated model finds evidence that inflation dynamics are different across countries in the nontradable sector only finally the balassa samuelson effect does not appear to be an important driver of the inflation differential during the emu period

non stationary hours in a dsge model the time series fit of dynamic stochastic general equilibrium dsge models often suffers from restrictions on the long run dynamics that are at odds with the data using bayesian methods we estimate a stochastic growth model in which hours worked are stationary and a modified version with permanent labor supply shocks if firms can freely adjust labor inputs the data support the latter specification once we introduce frictions in terms of labor adjustment costs the overall time series fit improves and the model specification in which labor supply shocks and hours worked are stationary is preferred

financial fragility in small open economies firm balance sheets and the sectoral structure episodes of large capital inflows in small open economies are often associated with a shift of resources from the tradable to the non tradable sector and sometimes lead to balance of payments crises this article builds a two sector dynamic model to study the evolution of the sectoral structure and its impact on financial fragility the model embeds a static mechanism of balance of payments crisis which produces multiple equilibria within a single time period when the non tradable sector is large enough compared to the tradable sector the article studies the dynamics induced by an increase in financial openness it shows that the relative size of the non tradable sector overshoots which makes the economy more likely to be financially fragile during the transitory dynamics using an extended version of the model the article conducts a quantitative analysis and shows that this mechanism accounts well for several episodes of large capital inflows that led to financial crises

incorporating resilience in the assessment of inclusive wealth an example from south east australia this paper explores the consequences of changes in a system s resilience on the sustainability of resource allocation decisions as measured by inclusive wealth iw arrow et al in environ resour econ 26 647 685 2003 we incorporate an estimate of resilience in iw by taking account of known or suspected thresholds that can lead to irreversible or practically irreversible changes in the productivity and value of assets and hence social welfare these thresholds allow us to identify policies or projects that may be leading to an increased risk of decline in capital stocks the wealth of the region such risks are not reflected through usual measures of current system performance e g agricultural production we use the goulburn broken catchment in south eastern australia as a case study to explore the significance and practicality of including resilience in inclusive wealth estimates

natural capital in integrated assessment models of climate change in integrated assessment models iams economic activity leads to global warming which causes future economic costs however typical iams do not explicitly represent the role of natural capital in this paper the dice model by nordhaus 2008 is expanded with a natural capital variable that is affected both by climate change and by depletive effects of economic activity due to a synergy between the two effects the optimal policy of the expanded model features more and earlier abatement of co2 emissions than dice interestingly the policy implications are different from what follows if one tries to capture the depletive effects on natural capital by simply reducing factor productivity growth in dice acknowledging considerable uncertainty simulations show that climate and savings rate policies from the expanded model are more robust in the long term than policies that do not consider non climatic depletion effects on natural capital

unprecedented changes in the terms of trade abstract the development of asia exposed commodity exporting economies to unprecedented changes in their terms of trade using a small open economy model we estimate changes in the long run level and variance of australia s terms of trade and study the quantitative implications of these changes an innovation of our analysis is to account in estimation for structural changes in the terms of trade we find that long run commodity prices increased by 35 in mid 2003 and that the volatility of shocks to commodity prices doubled soon after the increase in the level of commodity prices is much smaller than single equation estimates suggest this is because our inferences rely on many observables that in general equilibrium also respond to shifts in the long run level of the terms of trade

your money or your life green growth policies and welfare in 2050 this paper proposes a simple index of economic progress that weighs in the monetary cost induced by climate change mitigation policies as well as the health benefits arising from the reduction in local air pollution the shadow price of pollution is calculated indirectly through its impact on life expectancy taking into account the health benefits of mitigation policies significantly reduces their monetary cost in china and india as well as in countries with large fossil based energy producing sectors australia canada and the united states

antitrust and higher education was there a conspiracy to restrict financial aid in 1991 the u s justice department s antitrust division accused mit and the ivy league schools of fixing prices the schools claimed that their cooperative behavior enabled them to concentrate financial aid on needy students and did not affect price we analyze the empirical determinants of tuition and find no evidence that the schools agreement raised price we also analyze the appropriate application of the antitrust laws to nonprofit institutions and conclude that in the absence of adverse price or output effects the justification for the collective action should be considered under the rule of reason

the settlement of patent litigation in this article i develop a model to analyze patent licensing that is induced as part of a settlement agreement to avoid litigation of the issue of patent validity the patentee possesses private information about patent validity and makes a take it or leave it settlement offer to a single potential rival an essentially unique sequential equilibrium exists if out of equilibrium beliefs are restricted appropriately the model analyzes the effect of the probability of settlement and litigation

optimal disclosure delay in multistage r d competition abstract this paper analyzes the effects of a policy of disclosure with delay on the speed of discovery and incentives to invest in a multi stage patent race depending on the parameters four equilibrium configurations are obtained in the first a single firm acts as a monopolist in the second a single firm invests at the initial stages but the second firm joins the race after the disclosure of the intermediate product in the third both firms invest when they have equal knowledge but only the leader invests before the disclosure of the intermediate product in the last configuration firms always compete except when the disclosure date is close the determination of the optimal disclosure delay involves a trade off between the incentives to invest and the expected time of discovery of the final product

technology shocks in the new keynesian model in the new keynesian model preference cost push and monetary shocks all compete with the real business cycle model s technology shock in driving aggregate fluctuations a version of this model estimated via maximum likelihood points to these other shocks as being more important for explaining the behavior of output inflation and interest rates in the postwar u s data these results weaken the links between the current generation of new keynesian models and the real business cycle models from which they were originally derived they also suggest that federal reserve officials have often faced difficult trade offs in conducting monetary policy

net national product as an indicator of sustainability net national product nnp can potentially serve several objectives among others to measure value added and to be an indicator of welfare in the aftermath of the world commission on environment and development however it also seems important to investigate whether the concept of nnp can serve as an indicator of sustainability my point of departure following hicks 1946 ch 14 is therefore to require that nnp should measure what can be consumed in the present period without reducing future consumption possibilities and in line with this to argue that the nnp should equal the maximum per capita consumption level that can be sustained if sufficiently many facilitating assumptions are made then a concept of nnp that serves as an exact indicator of sustainability can easily be constructed for instance for a closed economy with a constant population a stationary technology and with only one capital good it follows that the present does not reduce future consumption possibilities if and only if it does not decrease the stock of the single capital good hence under the assumption that the one capital good k is identical to the one consumption good x nnp defined as y x k measures the maximal sustainable consumption at time t because then x y is equivalent to k the purpose of this note is to establish that with multiple capital goods it is not in general possible to construct an exact indicator of sustainability on the

on the effectiveness of patenting strategies in innovation races which if any of a firm s inventions should it patent should it patent at all many companies engaged in an innovation race seek a patenting strategy that balances protection of their intellectual property against the knowledge spillovers resulting from disclosure requirements not much is known about factors that determine the patenting strategy best able to resolve this trade off although scholars in various management economics and engineering disciplines have researched patents and patenting regimes little work has addressed the normative issues that pertain to forming an appropriate firm level patenting strategy we develop an inventory of real life patenting strategies and integrate them into a coherent framework our simulation model characterizes the optimal patenting choices for different environmental and firm level contingencies while capturing the dynamics between competing firms we identify the firm s research and development strategy as the most salient determinant of its optimal patenting strategy our research contributes to establishing a contingency theory of patenting strategies this paper was accepted by david hsu entrepreneurship and innovation

capital theory and the measurement of sustainable development an indicator of weak sustainability the measurement of sustainable development is not without considerable difficulties yet this should not detract from the positive advances that can be made in this direction in this paper we present one form that a weak sustainability indicator can take derived from a simple but intuitive savings rule it incorporates the idea that the level of overall capital stock should be non decreasing although subject to qualification at this stage some interesting results emerge from the application of the rule to 18 countries

environmental choices and hyperbolic discounting an experimental analysis environmental goods such as carbon abatement or green space development often generate benefit streams that may not occur until far into the future how individual consumers value such amenities therefore depends critically on the discount rate the usual assumption is that agents discount future values using constant exponential rate but there is some evidence from the lab suggesting that discount functions are more likely quasi hyperbolic we compare estimates of subjects rate of intertemporal time preference for financial rewards and environmental goods using multiple price list and a new matrix multiple price list approaches our objective is to determine if discount functions for environmental and monetary goods differ and to estimate the structure of discounting in both contexts we find that financial discount functions are not hyperbolic but those for environmental goods are discount rates for environmental goods are generally lower than for financial rewards but are still above zero consumers therefore value long lived environmental goods differently than financial goods

the welfare economic theory of green national accounts this paper takes a critical look at the literature on green national accounts the problem studied is to find a linear index of economic variables that responds to perturbations in the same direction as social well being the thesis of a large literature that net national product which is a flow is that index in closed economies is shown in some interpretations to be simply false and in others to suffer from deep estimation problems it is argued that capital depreciation using shadow prices should certainly be included in national accounts but that the right welfare index is a comprehensive measure of wealth defined as the shadow value of an economy s stock of all capital assets it is shown that comprehensive wealth is usable as a criterion for policy evaluation as well as for determining sustainable economic development

optimal versus sustainable degrowth policies abstract this paper introduces a natural resource and pollution in a ramsey growth model which relies on the postulates of ecological economics it studies the impact of voluntary degrowth policies on production and welfare the instrument of these policies is a tax on the natural resource these public policies are implemented after the downturn of the households welfare following from the increased pollution two kinds of policies are considered and rely either on an optimality criterion or on an intergenerational equity criterion with respect to the laissez faire case they decrease both production and pollution but increase welfare classes of sustainable degrowth paths characterized by time constant or time increasing tax rates are determined

what percentage of innovations are patented empirical estimates for european firms abstract a 1993 survey on the innovative activities of europe s largest industrial firms obtained useable results on patenting activities for 604 respondents the data are used to calculate the sales weighted propensity rates for 19 industries the propensity rates equal the percentage of innovations for which a patent application is made the propensity rates for product innovations average 35 9 varying between 8 1 in textiles and 79 2 in pharmaceuticals the average for process innovations is 24 8 varying from 8 1 in textiles to 46 8 for precision instruments only four sectors have patent propensity rates for both product and process innovations combined that exceed 50 pharmaceuticals chemicals machinery and precision instruments regression results that control for the effect of industry sector show that patent propensity rates increase with firm size and are higher among firms that find patents to be an important method for preventing competitors from copying both product and process innovations the effect of secrecy is not so straightforward firms that find secrecy to be an important protection method for product innovations are less likely to patent as expected but secrecy has little effect on the propensity to patent process innovations the r d intensity of the firm has no effect on patent propensity rates for both product and process innovations the sector of activity has a strong influence on product patent propensities but very little effect on process patent propensities after controlling for the effect of other factors

a new comparative approach to macroeconomic modeling and policy analysis in the aftermath of the global financial crisis the state of m acroeconomic modeling and the use of macroeconomic models in policy analysis has come under heavy criticism macroeconomists in academia and policy institutions are blamed for relying too much on a particular class of macroeconomic models that did not sufficiently this paper propose s a comparative approach to macroeconomic policy analysis that is open to competing modeling paradigms macroeconomic model comparison projects have helped produce some very influenti al insights such as the taylor rule however they have been infrequent and costly because they require the input of many teams of researchers and multiple meetings to obtain a limited set of comparative findings this paper provides a new comparative approach to model based research and policy analysis that enables individual researchers to conduct model comparisons easily frequently at low cost and on a large scale using this approach a model archive is built that incl udes many well known empirically estimated models that may be used for quantitative analysis of monetary and fiscal stabilization policies a computational platform is created that allows straightforward comparisons of models implications its application is illustrated by compa ring different monetary and fiscal policies across selected models researchers can easily include new models in the data base and compare the effects of novel extensions to established benchmarks thereby fostering a comparative instead of insular approach to model development

structural decompositions of energy consumption between 1995 and 2009 evidence from wiod abstract energy is key to achieving sustainable development this paper explicitly distinguishes between the supply side of energy consumption and demand side of energy consumption and investigates the factors that affect the energy consumption across economies using data from the world input output database wiod this paper decomposes the relative changes of energy consumption into intensity effect production structure structural change in final demand total final demand effect and household consumption then it further decomposes production structure into inter industry structural effect and trade effect in intermediate inputs overall energy consumption growth is mainly driven by total final demand 55 04 increase at the world level but can be significantly reduced by intensity effect due to technological change 21 02 decrease at the world level there is heterogeneity of structure related effects across economies and within the same economy in both aspects of energy consumption in addition the trade effect and household effect are relatively small this paper provides an empirical framework for analyzing energy consumption in a globalizing world and suggests tailored and integrated energy policies

deciding to enter a monetary union the role of trade and financial linkages abstract this paper evaluates the role of trade and financial linkages in the decision to enter a monetary union we estimate a two country dsge model for the u k economy and the euro area with financial intermediaries as in gertler and karadi 2011 we use the model to compute the welfare trade offs from joining the euro we compare the gains from trade that would occur after the adoption of the euro against the costs of relinquishing monetary policy both conventional and unconventional we also study the effects of the changes in the corporate risk premium observed during the recent crisis we find that in tranquil times when the risk premium volatility is low the net welfare gain of joining the monetary union is 2 4 percent of life time consumption during financial crises when there is a sharp increase in the volatility of the risk premium joining a monetary union would lead to a net welfare loss of 2 2 percent of life time consumption the welfare analysis underscores the importance of financial stability to sustain a monetary union over time

conversation with secrets we analyze the sustainability of a conversation when one agent might be endowed with a piece of private information that affects the payoff distribution to its benefit such a secret can compromise the sustainability of conversation even without an obligation the secret holder will disclose its secret if it prevents preemptive termination of the conversation the nonsecret holder lacks this possibility and stops the conversation competition and limited effectiveness of the conversation amplify this result of early disclosure and render the conversation process less sustainable we discuss policy and managerial implications for industry standard development and joint ventures

questioning demand a study of regretted purchases in great britain abstract this paper presents findings from a nationally representative household survey on the tendency to regret purchases across 20 product groups the survey reveals that the vast majority of adults in great britain 82 have regretted a purchase in the past post purchase regret is shown to be particularly prevalent for clothing footwear and takeaway food the tendency to regret purchases appears to reduce with age and to be more common amongst white collar rather than blue collar workers combining survey results with average price estimates gives an estimated aggregate annual expenditure on regretted purchases of 5 25bn equivalent to 2 10 of annual consumer spending on goods in great britain these findings are interesting because they suggest that there is a degree of self assessed over consumption that if reduced could help to reduce pressures on the environment

a dynamic analysis of human welfare in a warming planet anthropogenic greenhouse gas ghg emissions have caused atmospheric concentrations with no precedents in the last half a million years inducing serious uncertainties about future climates and their effects on human welfare recent climate science supports the view that the climate stabilization will require very low ghg emissions in the future we ask is a path of low emissions compatible with sustainable levels of human welfare with steady growth in human quality of life addressing these questions requires both defining welfare criteria and empirically estimating the possible paths of the economy we specify and calibrate a dynamic model with four intertemporal links education physical capital knowledge and the environment in line with nordhaus 2008a and with the stern review 2007 we assume that ghg emissions allow increased production while a higher stock of atmospheric carbon decreases production our index of human welfare which we call quality of life quol emphasizes education knowledge and the environment affected by greenhouse gas emissions in addition to consumption and leisure thus we avoid a consumptionist fallacy that welfare depends only on commodity consumption and perhaps leisure we reject discounted utilitarianism as a normative criterion and consider two alternatives the first is an intergenerational maximin criterion which maximizes the quality of life of the first generation subject to maintaining at least that level for all successive generations the second is human development optimization that seeks the maximization of the quol of the first generation subject to achieving a given constant rate of growth in all subsequent generations hence our analysis focuses on a human notion of sustainability as opposed to the conventional green sustainability limited to keeping the quality of the environment constant because our dynamic optimization programs defy explicit analytical solutions our approach has been computational as a benchmark we consider a simple model with physical and human capital for which we prove a turnpike theorem we then devise a computational algorithm inspired by the turnpike property to construct feasible although not necessarily optimal paths in the more complex and realistic model our analysis indicates that with ghg emission paths entailing very low emissions in the future positive rates of growth in quol are possible while the first generation experiences a quol higher than the historical reference level we also observe a tradeoff between the quality of life of the first generation and the rate of growth in the quality of life yet generation 1 s sacrifice for the sake of a higher growth rate appears to be small the paths that we compute involve investments in knowledge at noticeably higher levels than in the past

the economic analysis of biodiversity an assessment biodiversity is complex difficult to define difficult to measure and often involves international and intergenerational considerations biodiversity loss presents significant economic challenges a great deal of economics is required to understand the issues but a simple and important observation is that most species and ecosystems are not traded in markets so prices are often absent and biodiversity is under provided despite the formidable obstacles to high quality economic analysis economics has plenty to offer to biodiversity policy first economic valuation techniques can be employed to roughly estimate the value of the benefits provided by biodiversity and ecosystems second assessing the optimum amount of biodiversity involves recognizing that the conversion of natural capital into manufactured and human capital has so far generated vast amounts of wealth while there may have been too much biodiversity in the past economic analysis suggests that this is a difficult position to hold now third econometric techniques and carefully designed policy studies can assist in determining what policies are most suited to different contexts to cost effectively reduce biodiversity loss fourth political economy is helpful because international coordination is often required ecosystems do not respect national borders and many biodiverse ecosystems are in poorer countries this paper synthesizes the issues and proposes a research agenda which includes improving the measurement and accounting of natural capital improving valuation techniques and theory to provide greater guidance as to the optimum biodiversity and developing our understanding of the merits of different alternatives for government intervention to reduce biodiversity loss

imitation costs and patents an empirical study it has long been recognised that the costs of imitating new products have an important effect on the incentives for innovation in a market economy as arrow i962 and others have pointed out if firms can imitate an innovation at a cost that is substantially below the cost to the innovator of developing the innovation there may be little or no incentive for the innovator to carry out the innovation in their discussions of the innovation process economists frequently have called attention to the major role played by the costs of imitation but there has been little or no attempt to measure these costs to test various hypotheses concerning the factors influencing them or to estimate their effects in this paper we report some findings of what seems to be the first study of this topic in addition we present data regarding the effects of patents on imitation costs and on the rate of innovation

evaluating projects and assessing sustainable development in imperfect economies we are interested in three related questions 1 how should accounting prices be estimated 2 how should we evaluate policy change in an imperfect economy 3 how can we check whether intergenerational well being will be sustained along a projected economic programme we do not presume that the economy is convex nor do we assume that the government optimizes on behalf of its citizens we show that the same set of accounting prices should be used both for policy evaluation and for assessing whether or not intergenerational welfare along a given economic path will be sustained we also show that a comprehensive measure of wealth computed in terms of the accounting prices can be used as an index for problems 2 and 3 above the remainder of the paper is concerned with rules for estimating the accounting prices of several specific environmental natural resources transacted in a few well known economic institutions

on limiting or encouraging rivalry in technical progress the effect of patent scope decisions abstract this essay is on the effects of the scope of a patent e g how broad its allowed claims on subsequent inventing in a field it is argued that this depends on the topography of technical advance in a field in particular on how inventions are linked to each other and in the extent to which rapid technical advance requires a diversity of actors and minds as contrasted with being facilitated by express coordination of inventive activity technical advance is examined in several different fields with a focus on how patents influenced the pace and quality of development the authors conclude that allowing and enforcing broad patent claims tends to hinder technical progress

ownership risk investment and the use of natural resources the effect of insecure ownership on ordinary investment and natural resource use is examined insecure ownership is postulated to depend on the type of government regime in power and the prevalence of political violence or instability the political determinants of economy wide investment are estimated from cross country data and the results are used to form an index of ownership security when introduced into empirical models of natural resource use this index has a significant and quantitatively important effect on the use of forests and petroleum contrary to conventional wisdom ownership risk slows resource use in some circumstances

ethics politics and nonsatiation in consumption a synthesis in contrast with the production of goods and services by firms where the production costs are minimized under appropriate behavioral assumptions consumer producers in neoclassical theory maximize consumption expenditure i e production costs of their outputs according to kenneth boulding were the impact upon the limited resources available on planet earth taken into account consumption expenditure should be minimized we propose that we keep consumer theory as a reasonable description of reality however we should evaluate the long run consequences of such postulated behavior in a larger context which as a consequence of larger population with increasing per capita consumption comprises the overburdening of natural resources by decomposing the time horizon of cultural evolution into shorter periods of adjustment we may then distinguish several types of institutional determination of how societies take decisions as a group and individually the consumer theory simply reflects the predominant ethical values of which ideologies political platforms and demand patterns are shorter run adjustments

spatial aggregation and the value of natural capital abstract location matters for the value of capital assets the value of changes in natural capital wealth can depend on whether natural capital asset prices are measured locally and then aggregated or whether average values are applied over aggregate representative areas spatial heterogeneity of resource characteristics and institutions impact approximations of the intertemporal welfare function and accounting price function because when spatial aggregation precedes valuation it implies greater arbitrage opportunities leading to more inelastic shadow accounting price functions than when valuation is done locally and then aggregated aggregation of observed values across varying resource and institutional characteristics can lead to omitted variables bias we illustrate these results in the context of groundwater in the kansas high plains aquifer and demonstrate that the accounting price function is less elastic when the accounting price is measured locally failure to measure locally and then aggregate could lead to undervaluing scarce resources and overvaluing plentiful ones which biases wealth accounts in favor of passing the non declining wealth sustainability test

the economics of product patents this paper develops a model of product patents in which the patent changes the nature of market entry behavior rather than preventing entry entirely the model incorporates three levels of action namely the innovator s patenting decision the potential entrant s location decision and possible court action the analysis demonstrates how the characteristics of the patents system and the enforcement framework can influence rivals variety choices and thus the market equilibrium it also considers how the system can in principle be adjusted to improve social welfare copyright 1990 by american economic association

are we consuming too much this paper articulates and applies frameworks for examining whether consumption is excessive we consider two criteria for the possible excessiveness or insufficiency of current consumption one is an intertemporal utility maximization criterion actual current consumption is deemed excessive if it is higher than the level of current consumption on the consumption path that maximizes the present discounted value of utility the other is a sustainability criterion which requires that current consumption be consistent with non declining living standards over time we extend previous theoretical approaches by offering a formula for the sustainability criterion that accounts for population growth and technological change in applying this formula we find that some poor regions of the world are failing to meet the sustainability criterion in these regions genuine wealth per capita is falling as investments in human and manufactured capital are not sufficient to offset the depletion of natural capital

how broad should the scope of patent protection be i explore the trade off between a patent s length that is its lifetime and its width that is its scope of coverage a wider patent generally reduces the distortion of consumers choices between the patented brand of the product and unpatented lower priced varieties sold by competitors but also permits higher prices which increase relative to profits the deadweight losses from consumers switching consumption out of the product class i show under what conditions infinitely lived but very narrowly focused patents are the socially efficient way to reward innovation and under what conditions very short lived but very broad patents are optimal

the economics of the climate i review the economic characteristics of the climate problem focusing on the choice of discount rates in the presence of a stock externality risk and uncertainty ambiguity and the role of integrated assessment models iams in analyzing policy choices i suggest that iams can play a role in providing qualitative understanding of how complex systems behave but are not accurate enough to provide quantitative insights arguments in favor of action on climate issues have to be based on aversion to risk and ambiguity and the need to avoid a small but positive risk of a disastrous outcome

low climate stabilisation under diverse growth and convergence scenarios abstract in the last decade a number of papers have analysed the consequences of achieving the greenhouse gas concentration levels necessary to maintain global temperature increases below 2 c above preindustrial levels most models and scenarios assume that future trends in global gdp will be similar to the growth experienced in the past century which would imply multiplying current output by about 19 times in the 21st century however natural resource and environmental constraints suggest that future global economic growth may not be so high furthermore the environmental implications of such growth depend on how it is distributed across countries this paper studies the implications on ghg abatement policies of low global gdp growth and high convergence levels in gdp per capita across countries a partial equilibrium model poles of the world s energy system is used to provide detailed projections up to 2050 for the different regions of the world the results suggest that while low stabilisation could be technically feasible and economically viable for the world in all the scenarios considered it is more likely to occur with more modest global growth however that will imply higher global abatement costs relative to gdp convergence in living standards on the other hand places greater pressures in terms of the required reduction in emissions in general we find that there are major differences between regions in terms of the size and the timing of abatement costs and economic impact

sustainability in uncertain economies a stochastic growth model with a list of capital assets i e reproducible capital non renewable resources the knowledge base and institutions is studied to evaluate the effects of different sources of uncertainty on sustainability it is also discussed which measure can serve as an index of intergenerational welfare to evaluate sustainable development under uncertainty the aim is to consider a more comprehensive setting than is usually explored in the literature and to generalize arrow dasgupta and maler results to the case of uncertainty

novelty and disclosure in patent law the stringency of the novelty requirement in patent law affects the pace of innovation because it affects the amount of technical information that is disclosed among firms it also affects ex ante profitability of research we compare weak and strong novelty requirements from the standpoint of social efficiency we ask how our answer depends on the rule that determines which firm gets a patent when two firms have patents pending on the same technology the possible rules are first to invent which applies in the u s and first to file which applies everywhere else

accounting for u s real exchange rate changes this study measures the proportion of u s real exchange rate movements that can be accounted for by movements in the relative prices of nontraded goods the decomposition is done at all possible h

regional inflation spatial locations and the balassa samuelson effect evidence from japan we empirically analyse regional inflation using data from japan where there is no regulation to impede the free movement of labour capital goods and services across regions in particular our analysis will focus on the geographical location of regions and the productivity known as the balassa samuelson bs effect as explanations for the dynamics of regional inflation based on a spatial model which is consistent with the theoretical specification of the bs we have confirmed that while it is a relatively small country in terms of land area both spatial location and productivity are important determinants of regional inflation

irreversibility and uncertainty cause an intergenerational equity efficiency trade off abstract two important policy goals in intergenerational problems are pareto efficiency and sustainability i e intergenerational equity we demonstrate that the pursuit of these goals is subject to an intergenerational equity efficiency trade off our analysis highlights two salient characteristics of intergenerational problems and policy i temporal irreversibility i e the inability to revise one s past actions and ii uncertainty of future consequences of present actions in human environment systems we employ a two non overlapping generations model that combines an intragenerational production decision on the use of circulating capital and a non renewable resource with a negative intergenerational externality as an unforeseen contingency if initially unknown problems become apparent and policy is enacted after irreversible actions were taken policy making faces a fundamental trade off between ex post pareto efficiency and sustainability that is one can achieve either one of these two goals but not both

the environment as a commodity all economic activity is based ultimately on re sources found in nature whether it is consumption the point in exposing the morphology of produced or production or whether it is exchange the comgoods and services is not to construct a resource moditi es which are involved are made of constitutheory of a value there are any number of natural ents provided by nature thus the ingredients of resources and this alone precludes such an at any manufactured good are other produced goods tempted theory from being coherent my purpose labour time and skills and natural resources each rather is to use it to express surprise at the fact that of these constituent produced goods is in turn made despite the centrality of natural resources in eco up from the ingredients that went into its manufacnomic activity they find little room in economics ture namely labour time and skills natural rediscourses interest in resource economics more sources and further produced goods it follows particularly environmental economics has only that any manufactured commodity is ultimately a been intermittent and if we are currently witness combination of labour and natural resources ing a resurgence and this special issue is an ex ample of it we have also just lived through a labour too is a produced good even raw labour is decade long neglect during which much valuable an output manufactured by those natural resources research could have been done 2 we are way behind which sustain life resources such as the multitude where we should have been and could have been

regulating environmental threats environmental consequences of natural resource exploitation often entail threats of future occurrences of detrimental abrupt events rather than or in addition to inflicting a damage gradually the possibility of abrupt occurrence of climate change related calamities is a case in mind the uncertainty associated with the realization of these threats and their public bad nature complicate the design of optimal economic response we derive a pigouvian hazard tax schedule that implements the socially optimal outcome the tax is based on the expected cost of the hazard generating activities and serves to reduce hazardous emissions well in advance of the catastrophic occurrence a numerical example illustrates possible effects of the proposed regulation scheme implications for climate policy are discussed

pre grant patent publication and cumulative innovation abstract we examine the implications of pre grant publication pp of patent applications in the context of a cumulative innovation model we show that pp leads to fewer applications and fewer inventions but it may raise the probability that new technologies will reach the product market and thereby enhances consumer surplus and possibly total welfare as well

status effects and negative utility growth this paper explains the observed stagnation of happiness measures through a growth model in which agents care about conspicuous consumption normal goods confer direct utility while status goods confer utility only at the expense of others firms can improve the quality of both goods through r d the nash equilibrium of the consumer game results in the share of expenditure on status goods increasing with the number of times the status good has been improved as the economy grows resources for innovation are transferred entirely to status good r d the resulting long run rate of utility growth is negative

patent litigation as an information transmission mechanism patent litigation reveals important information about the validity of the contested patent to other potential entrants this paper explores the implications of such informational externalities for entry dynamics in the presence of multiple potential entrants the nature of the entry game can be one of either waiting or preemption depending on the degree of patent protection therefore the payoffs for the patentee and the initial imitator are discontinuous in the degree of patent protection furthermore strengthening intellectual property rights is not necessarily desirable for the patentee the analysis may also help explain the apparently puzzling practice of delaying patent suits copyright 1998 by american economic association

inclusive wealth with a changing but aging population we consider the effect of population age distribution in inclusive wealth accounting numerical results demonstrate that the wealth of nations with an aging demographic structure as well as those with a rapidly increasing working age generation may have been overestimated

knowledge disclosure as intellectual property rights protection abstract we consider the problem of an inventor who discloses knowledge under the threat of a rival who may patent a competing idea disclosure diminishes the probability that the rival has of receiving a patent legal externality but it also decreases the rival s marginal r d cost knowledge externality our results reveal that i when the knowledge externality is large small relative to the legal one an increase decrease in the patentability standard leads to higher disclosure and promotes r d and ii if subsequent research creates positive external effects the patentability standard should be set to promote further disclosure and r d in equilibrium the impact on the equilibrium configuration of changes in market profits is also examined

choices and the value of natural capital sustainability requires maintaining opportunities for future generations so they can meet their needs opportunities are passed to future generations through a set of capital assets nature provides an important class of these assets but markets seldom reveal the marginal value of natural capital rather the marginal social worth or asset price must be imputed based on intertemporal exchange in the context of assessing whether intertemporal allocation rules lead to sustainable development appropriate asset prices must be based on the actual allocations and trade offs society makes therefore measuring economic programmes that enable the measurement of asset prices is an important empirical task we review the theory of measuring natural capital asset prices and discuss the key elements of measuring economic programmes that enable the measurement of natural capital asset prices we place the measurement of economic programmes and natural capital asset prices in the context of wealth based sustainability metrics