ecosystem services from eye opening metaphor to complexity blinder abstract what started as a humble metaphor to help us think about our relation to nature has become integral to how we are addressing the future of humanity and the course of biological evolution the metaphor of nature as a stock that provides a flow of services is insufficient for the difficulties we are in or the task ahead indeed combined with the mistaken presumption that we can analyze a global problem within a partial equilibrium economic framework and reach a new economy project by project without major institutional change the simplicity of the stock flow framework blinds us to the complexity of the human predicament the ecosystem services approach can be a part of a larger solution but its dominance in our characterization of our situation and the solution is blinding us to the ecological economic and political complexities of the challenges we actually face

capital taxation and accumulation in a life cycle growth model almost all of the serious economic work on savings decisions within the past decade has relied on some variant of the life cycle hypothesis in which savings arise out of individual choices of an optimum lifetime consumption path this paper reexamines the incidence and welfare consequences of capital income taxes within a realistic life cycle model the results suggest that the elimination of capital income taxation would have very substantial economic effects for example a complete shift to consumption taxation might raise steady state output by as much as 18 percent and consumption by 16 percent the long run welfare gain from such a shift would for plausible parameter values exceed 150 billion annually stated somewhat differently shifting to consumption taxation would raise the lifetime utility of the representative consumer by the equivalent of about six years income in the new steady state these estimates dwarf estimates of the static welfare cost of taxation and significantly exceed even extreme previous estimates of the dynamic loss this study departs from earlier analyses of the effects of taxes on capital income in several respects probably the most important difference between this treatment and most preceding ones lies in the assumptions about the interest elasticity of saving it is shown below that the common two period formulation of saving decisions yields quite misleading results a more realistic model of life cycle savings demonstrates that for a wide variety of plausible parameter values savings are very interest elastic this implies that shifting away from capital income taxation would significantly increase capital formation making possible long run increases in consumption many studies of the welfare effects of capital income taxation have ignored the general equilibrium effects of increased capital formation in an economy with life cycle savings there is no presumption that the undistorted growth path corresponds to any sort of social optimum as peter diamond has shown life cycle savings can lead to a steady state capital intensity either greater or less than the golden rule level more generally it is clear that there is no reason to believe that a life cycle economy will maximize any particular intertemporal social welfare function a fundamental tenet of welfare evaluation is that preexisting distortions must be considered in evaluating the consequences of tax changes the results presented in this paper take explicit account of the nonoptimal character of the no tax steady state this explains in large part why such a sizeable welfare effect of capital taxes is found in an economy far from the golden rule level of capital intensity there are substantial gains in steady state consumption achievable through increased capital formation section i of the paper examines the aggregate savings function in a continuous time life cycle framework the second section clarifies the differences between wage and consumption taxes an aggregate production function is added to complete the model in the third section the effects of changes in capital taxes on both steady state incidence and welfare are considered within a general equilibrium framework the final section of the paper discusses some implications of the results and suggests areas which appear to warrant further study assistant professor of economics massachusetts institute of technology and research analyst national bureau of economic research i am grateful to alan auerbach martin feldstein laurence kotlikoff to the participants in the nber workshop on business taxation and to the harvard public finance seminar for useful discussions james poterba and james buchal performed the numerical calculations

wealth accumulation over the life cycle and precautionary savings this article constructs and simulates a life cycle model of wealth accumulation and estimates the parameters of the utility function the rate of time preference and the coefficient of risk aversion by matching the simulated median wealth profiles with those observed in the panel study of income dynamics and in the survey of consumer finances the estimates imply a low degree of patience and a high degree of risk aversion the results are used to study the importance of precautionary savings in explaining wealth accumulation they imply that wealth accumulation is driven mostly by precautionary motives at the beginning of the life cycle whereas savings for retirement purposes become significant only closer to retirement

taxation and excess burden a life cycle perspective a lifetime perspective is appropriate in assessing the welfare implications of government tax policies although a number of attempts have been made to ex amine the excess burden of taxation in life cycle models these have tended to ignore the role of human capital accumulation and or the leisure income choice in this paper we do numerical simulations with a model that takes both of these phenomena into account we find that under reasonable assumptions the failure to take into account distortions of human capital decisions produces substantial underestimates of the excess burden of income taxation in addition allowing for the endogeneity of human capital increases the efficiency of a personal consumption tax relative to that of an equal yield income tax this abstract was borrowed from another version of this item

consumption vs income taxes when private human capital investments are imperfectly observable abstract this paper considers optimal taxation in an endogenous growth model where private education investments are imperfectly observable consumption taxation is better than labor income taxation for public provision of goods unless educational investment is completely unobservable if subsidies are feasible for observed education investment the consumption tax rate is independent of the degree of observability but the subsidy rate is higher the lower is the observability if subsidies are not feasible the consumption tax rate is lower the more limited is the observability optimal tax rates for goods that provide consumption and education investment simultaneously are below normal rates for observed pure consumption growth and welfare are positively related to independent of the degree of observability without with subsidies

consumption path following a tax increase implications for the analysis of the welfare cost of taxation abstract the consumption path following a capital income tax increase is analyzed to demonstrate that short run increases in consumption dominate future declines in consumption for a considerable time it takes 25 years before a tax increase resutls in a loss of welfare

the transition from payroll to consumption receipts with endogenous human capital abstract the transition from payroll to consumption receipts is simulated in a life cycle growth model featuring adult human capital as in other studies savings are higher under the consumption base however unlike those studies much of the additional savings here take human form human capital production increases for all cohorts in or yet to join the labor market as of the tax change the additional human capital production tends to dampen physical capital accumulation when compared with otherwise identical simulations which hold human capital constant the implications for intergenerational incidence are similar to that found in other examinations of the transition to a consumption base

competitive consequences of interfirm collaboration how joint ventures shape industry profitability recent international business research on international joint ventures focuses on how firms can use such ventures for knowledge access and learning to enhance their competitiveness thereby increasing competition in the industry by contrast research in industrial organization economics has observed that firms can also use joint ventures in various ways to attenuate competition in this paper we join these two streams of research to investigate the conditions under which joint ventures reduce or enhance competition by empirically testing the effects of different types of joint ventures on industry profitability our results suggest that joint ventures can be pro competitive or anti competitive depending on whether or not they are formed between competing firms represent foreign market entry and operate in relatively concentrated industries our paper shows the importance of adopting a contingent approach to evaluating the competitive implications of joint ventures and it also points to the value of reinvigorating international business research on the competitive context and consequences of interfirm collaboration

corporate combinations and common stock returns the case of joint ventures the gain to stockholders from mergers is well documented however there is little evidence as to whether the source of the gain is due to synergy or management displacement merger is just one of an almost limitless variety of ways in which firms combine resources to accomplish some objective a joint venture is another in addition to being of interest as an independent phenomenon because the original managements of the parent firms remain intact under a joint venture investigation of wealth gains from joint ventures provides an opportunity to isolate the management displacement hypothesis from the synergy hypothesis as the source of gains in corporate combinations our results are 1 there are significant wealth gains from joint ventures 2 the smaller partner earns a larger excess rate of return while the dollar gains are more equally divided and 3 the gains scaled by resources committed yield premiums similar to those in mergers we are inclined to interpret our results as supportive of the synergy hypothesis as the source of gain from corporate combinations this paper is an empirical investigation of the common stock returns of u s companies that enter into joint ventures with other u s companies we consider joint ventures in the context of what is by now a burgeoning literature examining the security returns of companies involved in intercorporate mergers and tender offers 1 in this context our objective is to provide evidence as to the source of the well documented gains to stockholders of firms involved in mergers and tender offers in addition joint ventures are an interesting economic phenomenon in their own right they are undertaken by many of the largest u s companies involve billions of dollars in capital expenditures annually and are subject to considerable scrutiny in the popular press in this regard our analysis provides data on what is as yet a relatively unexplored area of economic activity 2 a corporate merger represents the joining together of all the resources of two companies under a single management to accomplish some set of objectives empirical studies have found that mergers generally result in significant increases in the total market values of the merging firms with the stockholders of the

marginal welfare costs of taxation with human and physical capital i introduction marginal welfare cost of taxation is the amount by which the social cost of an additional tax dollar differs from 1 because of distortionary taxation browning and johnson 1984 stuart 1984 browning 1987 ballard 1988 and allgood and snow 1998 use static models of the u s economy in which labor supplies adjust but the stocks of human and physical capital are fixed to calculate estimates of this welfare cost relevant to cost benefit analysis the studies by lucas 1990 and perroni 1995 incorporate human and physical capital into calculations of excess burden for the purpose of comparing alternative tax systems but do not address the welfare costs of marginal tax and spending reforms ballard et al 1985 and judd 1987 provide estimates of welfare cost using models that allow the stock of physical capital to change in response to marginal reforms but the stock of human capital is exogenous in these studies however judd 2001 argues that there is ample evidence indicating that human capital investment decisions have a significant effect on the cost of altering the tax system which suggests that these decisions could also have an important influence on marginal welfare cost in this article we present estimates of welfare costs for marginal reforms to government tax and spending policies when labor supply saving and education decisions are all endogenous we focus our analysis on marginal reforms because as skinner and slemrod 1985 observe most policy reforms enacted do not involve replacing one tax or spending system with another but instead typically entail marginal adjustments in tax laws and government appropriations using a perfect foresight overlapping generations model with a three period life cycle we derive analytical expressions for the changes in labor supply saving and education and use them to calculate marginal welfare cost as shown by auerbach et al 1983 in overlapping generations models steady state welfare comparisons of alternative tax policies are biased unless households are compensated for intergenerational redistribution along the transition path to arrive at our steady state estimates of welfare costs we adapt the compensation method introduced by gravelle 1991 for analyzing fundamental tax reforms to the context of incremental tax and spending reforms in a static one consumer model triest 1990 has shown that marginal welfare cost mwc is positive solely because of tax leakage the decline in tax revenue caused by reductions in the tax base we extend this insight to an intertemporal context that incorporates tax leakage arising from changes in both human and physical capital investment we evaluate three sets of reforms first a revenue neutral reduction in the tax on capital income funded by a higher tax on labor income second spending on a public good financed by either a higher tax on labor or interest income third a per capita lump sum transfer or demogrant also funded by either a higher tax on labor or interest income we find that marginal welfare costs are uniformly lower in the dynamic model where investment decisions are endogenous than in the static model where investment decisions are fixed and that the majority of the difference between the dynamic and static estimates is attributable to human capital decisions the principal reason is that a reallocation of time between labor hours and human capital investment has opposing and potentially offsetting effects on effective labor supply as a result labor supply responds less elastically in the dynamic model and changes in labor supply are the main source of tax leakage because wage taxation is the main source of tax revenue we also find that shifting marginal financing from capital to labor results in a lower welfare cost the reason being that such a change encourages saving which increases wage rates and stimulates labor supply leading to a reduction in marginal welfare costs

the effect of strategic alliances on firm productivity in south korea using a rich firm level data set from south korea this article analyses the impact of strategic alliances on firm performance focusing on how firm productivity is affected by alliance types such as joint venture joint technical development technical alliance joint marketing and coproduction as well as alliance structures such as intra and inter industry alliances total factor productivity tfp is estimated through the semi parametric method suggested by levinsohn and petrin 2003 in addition a two stage least squares 2sls method is applied to reduce the potential endogenous problem between productivity and strategic alliance choices the empirical results found in this article indicate that the engagement in joint ventures positively affects firm productivity and that the formation of international intra industry alliances has a positive impact on firm productivity

assessing the dynamic efficiency gains of tax reform when human capital is endogenous this paper develops a life cycle growth model with endogenous human capital accumulation and variable leisure which is employed to simulate dynamic equal yield changes from an income tax to a consumption tax although endogenizing human capital investment decisions raises partial equilibrium estimates of the efficiency costs of capital income taxation general equilibrium welfare impacts of unanticipated tax changes are little affected by the inclusion of endogenous human capital this finding cannot be fully explained by the presence of general equilibrium adjustments in factor prices and can be attributed in part to the existence of transitional rigidities in capital stocks copyright 1995 by economics department of the university of pennsylvania and the osaka university institute of social and economic research association

impacts of new entry and horizontal joint ventures on industrial rates of return data resources inc regional load curve models vols 1 and 3 aug sept 1981 engle robert clive w j granger allen mitchem and ramu ramanathan some problems in the estimation of daily load shapes and peaks modelling and analysis ofelectricity demand by time of day electric power research institute epri ea 1304 dec 1979 engle robert f clive w j granger and ramu ramanathan regional load curs e models querj s model long run forecasts and sensitidvity analysis epri ea 1672 vol 4 sept 1981 granger clive w j robert f engle ramu ramanathan and allan andersen residential load curves and time of day pricing an econometric analysis journal ofeconometrics 9 1979 13 32 granger clive w j et al a regional load curve model specification and estimation electric power research institute forthcoming graybill franklin theory and application of the linear model north scituate ma duxbury press 1976 hanushek eric a efficient estimators for regressing regression coefficients the american statistician 28 may 1974 66 67 mitchem allen a regional model of time of day elasticity demand a tiuo stage approach unpublished phd dissertation university of california at san diego 1981 poirier dale economic issues in land forecasting modelling and analysis of electricity demand by time oj day epri ea 1304 dec 1979 ramanathan ramu robert f engle and clive w j granger regional load curlve models querj s model long run forecasts and sensitivity analysis epri ea 1672 vol 2 aug 1981 university of arizona engineering experiment station modelling and analysis of electricity demand by time of day epri ea 1304 dec 1979 proceedings of the epri workshop at san diego u s department of commerce notes on temperaturehumidity index l s 5922 june 1959

taxes in a life cycle growth model with bequests and inheritances in a recent paper lawrence summers 1981 analyzes alternative taxes in a life cycle growth model this paper extends his analysis to include bequests and inheritances this inclusion is worth undertaking for several reasons first several recent empirical studies have suggested that bequests may account for an important share of the capital stock laurence kotlikoff and summers 1981 second it is important to explore whether the comparison of taxes is significantly affected when a bequest motive is introduced third the treatment of bequests under a consumption tax is controversial the endowment rationale calls for treating a bequest as taxable consumption by the deceased peter mieszkowski 1980 the real wage rationale calls for exempting bequests if such exemption raises the steady state capital intensity and real wage my 1980 article this paper confines itself to positive analysis of steady states transition paths and normative implications are explored elsewhere see my 1982 paper

the stability of joint ventures reciprocity and competitive rivalry the focus of the following empirical analysis is the influence of reciprocity and long term relationships on the stability of joint ventures these cooperative incentives are offset by industry structural conditions which may promote competitive rivalry among the partners to separate these effects on joint venture survival the hypothesized relationships are proxied by variables drawn from industry and questionnaire data and estimated under a hazard model specification a theoretical implication of the findings is to suggest a shift of attention from the transaction to the economic relationship as the unit of analysis copyright 1989 by blackwell publishing ltd

payments for ecosystem services as commodity fetishism abstract payments for ecosystem services pes economically reward resource managers for the provision of ecosystem services and are thus characterised by i an ecological function subject to trade ii the establishment of a standard unit of exchange iii and supply demand and intermediation flows between those who sell and buy ecosystem services this paper departs from the term commodity fetishism broadly understood as the masking of the social relationships underlying the process of production to illuminate three invisibilities in the commodification of ecosystem services firstly we argue that narrowing down the complexity of ecosystems to a single service has serious technical difficulties and ethical implications on the way we relate to and perceive nature secondly the commodification of ecosystem services denies the multiplicity of values which can be attributed to these services since it requires that a single exchange value is adopted for trading finally we suggest that the process of production exchange and consumption of ecosystem services is characterised by power asymmetries which may contribute to reproducing rather than addressing existing inequalities in the access to natural resources and services

eliminating interest taxation and tariffs the underpinnings for recent canadian policy blanchard s 1985 formulation of the overlapping generations model and the so cial welfare function advocated by calvo and obstfeld 1988 are used to analyse interest taxation and tariffs in a small open economy when the revenue lost from the elimination of these taxes is replaced by raising the tax on labour as in recent canadian experience a low social discount rate is required for the model to support lower interest income taxes while a high discount rate is needed to support the elimination of tariffs we illustrate the empirical importance of this simultaneous need for both a high and a low discount rate eliminer l imposition des revenus d interet et les droits de douane les soubassements de la politique canadienne re cente les auteurs utilisent la formulation blanchard du modele des generations qui se chevauchent et la fonction de bien etre social de calvo et obstfeld pour analyser les effets de l imposition des revenus d interet et des droits de douane dans une petite economie ouverte quand la perte de revenus attribuable a l elimination de ces taxes est comblee par un imp6t sur le travail comme ce fut le cas au canada il faut postuler un taux d escompte social bas pour qu on puisse endosser une politique de reduction de l imposition des revenus d interet alors qu il faut postuler un taux d escompte social eleve pour endosser une politique de reduction des droits de douane les auteurs montrent l importance empirique de cette necessite d avoir un taux d escompte a la fois bas et haut

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

impacts of domestic joint ventures on industrial rates of return a pooled cross section analysis 1964 1975 empirical evidence on the relations among diversification concentration and profitability is inconclusive on whether any relation exists in this note changes in diversification and concentration in u s manufacturing industries are examined over the period 1963 72 when a major expansion in diversification took place the zero order correlations between changes in concentration and in diversification either out of or into an industry tend to be positive and significant the relation becomes insignificant when other variables especially market growth are controlled however a positive relation between changes in concentration and inbound diversification does remain significant among the less concentrated industries where it seems more likely to reflect real economies enjoyed by diversifying companies than the exercise of market power

is college financial aid equitable and efficient nk reed based financial aid is often defended both on grounds of equity and efficiency equity because it provides equality of opportunity and efficiency because it encourages the formation of productive human capital james 1988 however need is now determined in a way that is both inequitable and inefficient an informal survey of my colleagues who do not study financial aid revealed no one who named the financial aid system as a substantial tax on savings however once this interpretation was suggested they quickly revealed their unanimous and disturbing impression that savings are summarily confiscated from parents upon their first child s matriculation at university though exaggerated this impression is not without foundation two families with identical earnings paths pay dramatically different amounts for college if one saves more than the other thus while the financial aid system may contribute to vertical equity since the poor get more aid than the rich its horizontal inequities are substantial moreover the federal rules for financial aid raise significant efficiency concerns 1 they might conceivably distort many household decisions including family size and the spacing of children however this paper will focus upon the most important incentive distorted by present policies the incentive to save because saving leads to receiving less financial aid a family s return to saving is substantially below the social return this may lead to families making inefficient intertemporal choices and correspondingly to an inefficient loss of capital formation

in markets we trust setting the boundaries of market based instruments in ecosystem services governance abstract a growing tendency to frame environmental problems as a failure to price ecosystem services has coincided with the rise of so called market based instruments mbis the aim of this introductory article to the special section in markets we trust contrasting views on the performance and legitimacy of market based instruments in global environmental governance is to promote critical reflection about the nature scope and limits of mbis in ecosystem services governance and to provide guidance on where the boundaries for the application of markets ought to be set first we examine the role that methodological assumptions and implicit normative positions play in shaping academic perception of the effectiveness and legitimacy of mbis second we examine mbis in the broader ideological context and socio political processes that have favored their development and implementation third we test claims of the literature on mbis against insights and data from case studies presented in the special section fourth we discuss the scope and limits of markets in ecosystem services governance in the light of biophysical institutional and normative boundaries we end with a summary of concluding remarks from the special section and by identifying critical tasks for the scientific and policy agenda on ecosystem services governance

measuring the welfare costs of inflation in a life cycle model abstract in a neoclassical growth model with life cycle households in which money is held to satisfy a cash in advance constraint the optimal steady state inflation rate is absurdly high in excess of 20 lump sum age independent money injections twist and flatten the lifetime profile of utility making this profile look more like the one that would be chosen by a planner the cost of monetary finance of lump sum payments is the distortion introduced to the labor leisure choice

can payments for environmental services help reduce poverty an exploration of the issues and the evidence to date from latin america summary this paper examines the main ways in which payments for environmental services pes might affect poverty pes may reduce poverty mainly by making payments to poor natural resource managers in upper watersheds the extent of the impact depends on how many pes participants are in fact poor on the poors ability to participate and on the amounts paid although pes programs are not designed for poverty reduction there can be important synergies when program design is well thought out and local conditions are favorable possible adverse effects can occur where property rights are insecure or if pes programs encourage less labor intensive practices 2004 elsevier ltd all rights reserved

the history of ecosystem services in economic theory and practice from early notions to markets and payment schemes article i nfo this paper reviews the historic development of the conceptualization of ecosystem services and examines critical landmarks in economic theory and practice with regard to the incorporation of ecosystem services into markets and payment schemes the review presented here suggests that the trend towards monetization and commodification of ecosystem services is partly the result of a slow move from the original economic conception of nature s benefits as use values in classical economics to their conceptualization in terms of exchange values in neoclassical economics the theory and practice of current ecosystem services science are examined inthelight ofthis historicaldevelopment from thisreview we conclude thatthefocus onmonetary valuation and payment schemes has contributed to attract political support for conservation but also to commodify a growing number of ecosystem services and to reproduce the neoclassical economics paradigm and the market logic to tackle environmental problems

macroeconomic effects of factor taxation with endogenous human capital evolution theory and evidence the distortionary effect of factor income taxation has been one of the central issues in public finance theory for example see feldstein 4 boadway 3 homma 6 summers 14 and judd 8 a tax on capital income in contrast to a tax on labor income has been claimed to create an intertemporal distortion that affects the future paths of macro aggregates adversely through the decumulation of physical capital hence it is generally concluded in the aforementioned literature that capital taxation is more distortionary in the long run than labor taxation in this paper we revisit this issue by constructing a dynamic general equilibrium model with infinitely lived perfectly foresighted agents unlike most of the existing literature we develop a growth model in which both physical and human capital are endogenously accumulated 2 within this framework a tax on labor generates a distortionary effect on both human capital evolution and future dynamic paths of output and consumption analogous to the case of capital taxation in contrast to results in previous work labor income taxation in our economy can be more distortionary than capital income taxation even in the long run many studies for years have focused on welfare comparison of factor taxes in most cases calibration or simulation exercises are performed and there has been no empirical research to con

progressive taxation in a dynastic model of human capital abstract we develop a quantitative theory of economic inequality to investigate the effects of replacing the current u s progressive income tax system with a proportional one the cross sectional implications of the theory are used to discipline the assessment of the effects of tax policy and circumvent the lack of conclusive micro evidence on the parameterization of the human capital production technology we find that the elimination of progressive taxation increases steady state level of output by 12 6 capital by 21 8 and consumption by 13 2 moreover it increases economic inequality and its persistence across generations

wages effort and incentive compatibility in life cycle employment contracts existing models of incentive compatibility in life cycle employment contracts arrive at different predictions partly because of the different kinds of contract breaking behavior allowed in them this paper sets out and classifies the full range of such behaviors argues that no model has yet incorporated all of them and examines the consequences of doing so in the context of lazear s well known model in the extended model wages cannot rise faster than marginal products throughout the entire contract and the set of feasible contracts can often be empty even when both parties can commit to terminate the contract whenever it is broken by the other party

savings and wealth in models with altruistic bequests during recent years much attention has been given to the role of bequests in explaining various aspects of economic behavior for example authors have studied the impact of bequests on physical wealth accumulation laurence kotlikoff and lawrence summers 1981 the interest elasticity of savings owen evans 1983 tax reform laurence seidman 1984 and the distribution of wealth alan blinder 1976a more recently economists have begun to distinguish between human and physical bequests gary becker and nigel tomes 1986 acknowledging the presence of bequest in human form is important in analyzing each of the issues mentioned above outlays on children affect the shape of the family s labor supply and expenditure profiles upon which the level of aggregate savings crucially depends if these outlays are interest sensitive substitutes for physical bequests they will also influence the interest elasticity of savings in the area of tax reform the neutrality of the consumption tax depends on the ability of the government to identify human capital bequests from general consumption raymond batina 1987 if this is not possible the portfolio choice of investment in human versus physical capital may be distorted at the margin finally the unequal transmission of wealth across generations may be explained by the lack of physical bequests and the inefficiently low levels of human bequests made by wealthconstrained households becker and tomes 1986 to distinguish clearly the behavior of constrained households from unconstrained households who make sizeable physical bequests both types of bequests must be recognized this paper introduces a model that makes explicit examination of these issues possible it extends lord s 1989 multiperiod model of life cycle savings and adult human capital investment by adding altruistically motivated human and physical bequests 2 the model is calibrated using microeconomic data on earnings time and goods expenditures on children s human capital and physical bequests we then use the model to examine the contribution of bequests to wealth accumulation and the level of savings this topic is the source of an important but yet unresolved debate between franco modigliani 1988 and kotlikoff 1988 kotlikoff maintains that u s wealth accumulation is primarily the consequence of bequests as opposed to life cycle savings for retirement one type of evidence cited by kotlikoff comes from simulation results demonstrating the failure of realistically calibrated life cycle models to generate sufficiently high saving rates and wealth income ratios alan auerbach and kotlikoff 1987 we show however that if a pure life cycle

the intertemporal allocation of expenditure on non durables services and durables this paper presents estimates of the parameters of a consumption function for u s quarterly seasonally unadjusted data on non durables services and durables the theoretical novelty in the approach we present is in the derivation of the consumption function from an underlying many goods allocation problem applying this model with an appropriate estimator to the data we find i the homogeneity restrictions suggested by theory are not rejected ii there is no evidence of excess sensitivity to income iii there is no evidence to suggest that agents cannot adjust their durable stocks as they would wish and iv the intertemporal substitution elasticity is not well determined

government debt in an overlapping generations model with bequests and gifts in 1974 robert barro argued that if individuals in successive generations were linked by bequests changes in the stock of government debt or in social security programs would have no effect on the steady state capital stock barro assumed that individuals held static expectations and that the size of the population was constant martin feldstein 1974 1977 had concluded that social security would reduce the capital labor ratio in models that did not admit a bequest motive and in his 1976 comment on barro argued that the introduction of government debt or social security into a perfect foresight dynamic growth model with bequests would still reduce the capital labor ratio barro replied that feldstein s criticisms were invalid if the steady state capital labor ratio were smaller than the golden rule level but would be correct if the opposite were true barro did suggest however that the latter possibility with overaccumulation of capital might be ruled out in his model as it was in miguel sidrauski 1967 but he was unable to demonstrate that the required behavior would be consistent with utility maximization by finite lived individuals 1976 p 345 although recent work by willem buiter 1979 jeffrey carmichael 1979 1982 truman bewley 1981 a b and others has helped to elucidate the nature of overlapping generations models with bequests and gifts and the issues in the barro feldstein debate they remain far from clear the purpose of this paper is to shed a little more light on the subject in what follows i contend that some of the authors cited above either have specified the individual s optimization problem in an asymmetric way or have failed to impose necessary conditions for a sensible optimization problem or both there is a natural specification of the barro model 1 that emphasizes the similarity between this model and optimal growth models see for example david cass 1965 peter diamond 1973 here in steady state equilibrium the aftertax interest rate r must equal the rate at which individuals discount the utility of their heirs p r p has become known as the modified golden rule and a meaningful individual optimization problem requires that p exceed n the natural growth rate of the economy my results confirm barro s hunch about his model in a barro model r must exceed n much of the barro feldstein 1976 interchange which assumed that r could have any relation to n is wrong headed barro and feldstein reach different conclusions about the effects of government debt and social security because they assume different individual utility functions also my results contrast sharply with those of buiter and carmichael for example carmichael concluded that with intergenerational transfers from parents to children bequests r must exceed n but with transfers in the opposite direction n must exceed r 1982 pp 205 06 indeed i believe that the buiter carmichael representation of the barro model is logically faulty see section ii in section i i outline an overlapping generations model with gifts and bequests and derive its steady state properties in the next section i discuss the shortand long run effects of introducing government debt into the model and contrast my results with those

reprint of ecosystem services concepts and approaches in conservation just a rhetorical tool abstract many commentators have raised questions about the recent focus on ecosystem services es concepts in conservation but little empirical analysis exists we present a novel empirical analysis using interviews and q methodology to examine how conservation practitioners and organisations are interpreting and using es concepts and associated approaches we find that these concepts are being adopted for instrumental imperatives to broaden constituencies and with an expectation of extending funding sources we uncover concerns within conservation that the utilitarian emphases of es concepts may compromise the ability to make non utilitarian arguments for nature in the future in relation to changing practice we examine shifts in partnerships and funding where es ideas provide a shared language about flows of value apparently accelerating the integration of conservation and the private sector whilst many respondents noted the significance of shifts related to es ideas some attempted to play these down presenting their organisation s adoption of these ideas as just a rhetorical tool however we argue that the adoption of es concepts cannot be presented as solely rhetorical given that these increasingly underpin and inform planning tools and policy instruments

market valuation of joint ventures joint venture characteristics and wealth gains abstract along with rd that is the nature of relationship between partners the relatedness and the strategic implication of joint ventures to partners the extent of partners control over joint ventures and the corporate governance in parent firms the data set consists of two party equity joint ventures in the electronics industry that were launched between 1979 and 1988 the unit of analysis is the 174 u s firms out of 158 joint ventures of which 113 were cross border agreements and 45 were between u s firms the study applies the event study method to assess stockholders risk adjusted wealth gains and a cross sectional analysis based on a generalized least squares model to test the hypotheses contrary to popular belief our results show an overall favorable reaction to joint venturing in the stock market even though there is substantial variation according to contextual influences the findings show that stock market valuations reflect the economic potential of joint ventures and are affected by the degree and type of control shareholders and partners can exercise the first key finding in the study is that the valuation effect of joint ventures is multifaceted the market valuation of joint ventures depends on the relationship between partners the nature of partners contributions the extent of partners control over joint ventures and the corporate governance in parent firms our findings also show that partner size which has not been studied in prior studies is a critical variable affecting wealth gains from joint ventures our results certainly shed light on understanding the effect of size on corporate wealth gains from joint ventures the results provide conflicting support for most hypotheses depending on firm size implying that joint ventures have different strategic and managerial implications for the partners depending on size shareholders tend to perceive joint ventures as a risky entrepreneurial operation particularly for the smaller partners it is indeed difficult to protect the smaller partners firm specific know how from being appropriated by the other partners accordingly smaller firms role and degree of control in a joint venture substantially affect wealth gains from their joint venturing with larger corporations shareholders value majority equity sharing by smaller partners as an important governance mechanism to control resource flows and avoid opportunistic behaviors by the larger partners whereas this study extends the previous findings on positive wealth gains of joint ventures by examining contextual influences it also attempts to fill the void in the field of corporate entrepreneurship despite the growing interest in corporate entrepreneurship there has been little attempt to empirically examine its potential association with corporate financial performance in particular with market based performance measures or wealth gains financial theory posits that accounting based performance measures do not properly measure the value of managers entrepreneurial decisions rappaport 1986 argued that the true measure of the long run value of an investment decision is economic value for shareholders as measured by abnormal stock returns i e wealth gains our study is an extension of this fast emerging field of study on the relationship between corporate entrepreneurship and financial performance by focusing on corporate wealth gains from joint venturing with other firms in pursuit of entrepreneurial goals