the variance gamma v g model for share market returns a new stochastic process termed the variance gamma process is proposed as a model for the uncertainty underlying security prices the unit period distribution is normal conditional on a variance that is distributed as a gamma variate its advantages include long tailedness continuous time specification finite moments of all orders elliptical multivariate unit period distributions and good empirical fit the process is pure jump approximable by a compound poisson process with high jump frequency and low jump magnitudes applications to option pricing show differential effects for options on the money compared to in or out of the money copyright 1990 by the university of chicago

territorial innovation models a critical survey moulaert f and sekia f 2003 territorial innovation models a critical survey reg studies 37 289 302 this paper provides a critical review of the literature on territorial innovation models industrial districts milieux innovateurs new industrial spaces local production systems etc the review is organized in two stages first the main features of each of these models and their view of innovation are compared second their theoretical building blocks are reconstructed and evaluated from the point of view of conceptual clarity and analytical coherence it is found that despite some semantic unity among the concepts used economies of agglomeration endogenous development systems of innovation evolution and learning network organization and governance territorial innovation models tims suffer from conceptual ambiguity the latter is mainly a consequence of the way territorial innovation is theorized i e in terms of technologically driven innovation and a business culture that is ma

making sense of the competitiveness debate the debate over national competitiveness is marked by some basic misperceptions with few exceptions those who use the term have a crude essentially mercantilist view of world trade in which competition among nations is just like competition between corporations not only do the authors and readers of reports on national competitiveness usually not understand comparative advantage they are unaware of the most basic adding up constraints economists however find it hard to believe that seemingly well informed people can really be this naive and assume that there must be more sophisticated ideas lying behind what they say the rationales offered by economists in turn offer false comfort to the would be sophisticates who like the term competitiveness they believe that they have transcended conventional economic theory when the fact is that they have failed to comprehend it in short the actual level of discussion is lower than any of the participants imagines copyright 1996 by oxford university press

upgrading in global value chains lessons from latin american clusters it has been shown that clustering helps local enterprises in industrial districts overcome growth constraints and compete in distant markets in advanced and less developed countries nevertheless recent contributions have stressed that more attention needs to be paid to external linkages and to the role played by global buyers to foster upgrading at cluster levels in this study we contribute to this debate focusing on the analysis of the relationships existing between clustering global value chains upgrading and sectoral patterns of innovation in latin america we find that sectoral specificities matter and influence the mode and the extent of upgrading in clusters integrated in global value chains

moving innovation systems research to the next level towards an integrative agenda the concept of innovation systems has been a guiding paradigm of innovation research and strongly influenced research and innovation policy since the early 1990s in spite of this success criticisms have been raised in recent years about whether it is still a suitable framework for addressing the innovation related challenges of the future in the present paper we claim that systemic explanations of innovation success have still a very important role to play in order to address the rising criticism however we have to reconsider the conceptual core of the family of innovation systems is approaches and sketch out a path for renewal the paper retraces the conceptual roots of is approaches assesses their uptake in different policy circles around the world discusses the conceptual core and explanatory ambition and finally formulates a future oriented research agenda for a more integrative innovation systems framework

labor contracts and business cycles this paper investigates the claim often put forth by real business cycle proponents that the poor performance of their models in matching real world aggregate labor market behavior is due to the fact that observed real wage payments do not correspond to the actual marginal productivity of labor but contain an insurance component that cannot be accounted for by the walrasian pricing mechanism to test this idea we dispense with the walrasian description of the labor market and introduce contractual arrangements between employees and employers assuming that employees are prevented from accessing capital markets and are more risk averse than employers we use the theory of optimal contracts to derive an equilibrium relation between aggregate states of the economy and wage labor outcomes this contractual arrangement is then embedded into a standard one sector stochastic neoclassical growth model in order to look at the business cycle implications of the contractual hypothesis the resulting dynamic equi

the effect of asymmetries on optimal hedge ratios there is widespread evidence that the volatility of stock returns displays an asymmetric response to good and bad news this article considers the impact of asymmetry on time varying hedges for financial futures an asymmetric model that allows forecasts of cash and futures return volatility to respond differently to positive and negative return innovations gives superior in sample hedging performance however the simpler symmetric model is not inferior in a hold out sample a method for evaluating the models in a modern risk management framework is presented highlighting the importance of allowing optimal hedge ratios to be both time varying and asymmetric

legitimizing research technology and innovation policies for transformative change combining insights from innovation systems and multi level perspective in a comprehensive failures framework abstract the recent policy debates about orientating research technology and innovation policy towards societal challenges rather than economic growth objectives only call for new lines of argumentation to systematically legitimize policy interventions while the multi level perspective on long term transitions has attracted quite some interest over the past years as a framework for dealing with long term processes of transformative change but the innovation systems approach is still the dominant perspective for devising innovation policy innovation systems approaches stress the importance of improving innovation capabilities of firms and the institutional settings to support them but they are less suited for dealing with the strategic challenges of transforming systems of innovation production and consumption and thus with long term challenges such as climate change or resource depletion it is therefore suggested to consider insights from transition studies more prominently in a policy framework that is based on the innovation systems approach and the associated notion of failures we propose a comprehensive framework that allows legitimizing and devising policies for transformative change that draws on a combination of market failures structural system failures and transformational system failures

exporting manufactures human resources natural resources and trade policy whether a country s exports consist mainly of manufactures or mainly of primary products depends fundamentally on the skills of its labour force relative to the extent of its natural resources this proposition derived from a modified version of heckscher ohlin theory is supported by a strong cross country correlation between the manufactured primary export ratio and the skill land ratio cross country variation in trade policies is now only a minor cause of variation in the manufactured primary export ratio

the private sector in agricultural research systems will it fill the gap abstract this article examines whether the private sector can fill the gap of declining public research in developing countries economic theory suggests private for profit research will focus on areas where returns to research are appropriable and reasonable profits are generated actual private for profit research activities concentrate on countries and industries with large markets appropriable returns strong science infrastructure and favorable government policies governments and donors can promote private research by easing constraints to private entry and operations but if governments stop funding research on public goods and technologies with limited market potential the private sector is unlikely to fill the gap completely

bivariate garch estimation of the optimal commodity futures hedge six different commodities are examined using daily data over two futures contract periods cash and futures prices for all six commodities are found to be well described as martingales with near integrated garch innovations bivariate garch models of cash and futures prices are estimated for the same six commodities the optimal hedge ratio ohr is then calculated as a ratio of the conditional covariance between cash and futures to the conditional variance of futures the estimated ohrs reveal that the standard assumption of a time invariant ohr is inappropriate for each commodity the estimated ohr path appears non stationary which has important implications for hedging strategies

sources procedures and microeconomic effects of innovation fabio arcangeli paul david frank engelman christopher freeman massimo moggi richard nelson luigi orsenigo nathan rosenberg michele salvati g n von tunzelman two anonymous referees and the participants at the meeting of the committee on distribution growth and technical progress of the italian national research council cnr rome november 16 1985 have helped with various redraftings a particularly grateful acknowledgment is for the insightful and patient help of moses abramovitz this work has been undertaken at the science policy research unit spru university of sussex as part of the research program of the designated research centre sponsored by the economic and social research council esrc earlier support to the research that led to this paper by the italian national research council cnr is also gratefully acknowledged the statistical research has been undertaken with the assistance of stephano brioschi ilaria fornari and giovannu prennushi

technological regimes and schumpeterian patterns of innovation this paper proposes that the specific pattern of innovative activities in an industry can be explained as the outcome of different technological learning regimes a technological regime is defined by the particular combination of technological opportunities appropriability of innovations cumulativeness of technical advances and properties of the knowledge base building upon the distinction between schumpeter mark i and schumpeter mark ii industries this paper provides empirical estimates of the relationships between indicators of the schumpeterian patterns of innovation concentration of innovative activities stability in the hierarchy of innovators and importance of new innovators and indicators of the variables defining technological regimes

real wages over the business cycle evidence from panel data one topic on which keynes did not disagree with classical economists was the cyclical behavior of real wages keynes 1936 as well as various classical writers predicted that real wages should move countercyclically quoting the general theory p 17 in general an increase in employment can only occur through the accompaniment of a decline in real wages thus i am not disputing this vital fact which the classical economists have rightly asserted as indefeasible this prediction is based on the premise of competition and a given short run capital stock increases in employment then correspond to more intensive use of capital and through diminishing product lower real wages for this reason evidence by dunlop 1938 and tarshis 1939 that real wages move procyclically was viewed as paradoxical both dunlop and tarshis based their findings on an observed positive correlation between real and money wages which given the procyclical movement of money wages implies a positive correlation between

public procurement and innovation resurrecting the demand side abstract demand is a major potential source of innovation yet the critical role of demand as a key driver of innovation has still to be recognised in government policy this article discusses public procurement as one of the key elements of a demand oriented innovation policy the paper starts by signaling the new significance of public procurement for innovation policy strategies at the eu level and in a range of european countries it then defines the concept of public procurement and embeds this concept within a taxonomy of innovation policies the rationales and justifications of public procurement policies to spur innovation are discussed followed by a consideration of the challenges and potential pitfalls as well as appropriate institutional arrangements and strategies including some recent empirical examples of good practice it concludes by confronting the public procurement approach with two of the most common objections to it and by considering future prospects

exploring the dynamics of water innovation foundations for water innovation studies the urgent need for innovation to address multifaceted and intertwined water related challenges is becoming increasingly clear acknowledged and responded to with cumulating sources and amounts of funding nevertheless the water sector has been claimed to be less innovative than other sectors this special volume on the dynamics of water innovation is based on the realization that in general there is a striking absence of academic studies on the dynamics of water innovation this sv is therefore designed to lay the foundations for the field of water innovation studies in an effort to integrate the emerging insights together the contributions in this sv capture the current understanding of the dynamics of water innovation and provide insights into how the water innovation process can be fostered the purpose of this introductory article is threefold namely to frame the discussion on water innovation dynamics in order to contextualise the contributions of this sv to provide systematic guidance for studying water innovation dynamics and to suggest the way forward for water innovation studies it captures the extent of the field of water innovation studies with a review of the literature of the last three decades and frames water innovations based on five decades of innovation research and drawing on three areas management strategy and policy we provide an innovation studies taxonomy that consists of four organising dimensions type of innovation stage of innovation level of analysis and measurement this taxonomy enables researchers to study the dynamics of water innovation from different combinations of conceptual and thematic angles drawing on the field of innovation studies in a systematic fashion finally we reflect on the way forward for water innovation studies with suggestions for future research 2017 the authors

testing between competing models of real business cycles this paper tests a real business cycle model with efficient long term labor contracts the efficient long term contract model against a standard real business cycle model the intertemporal substitution model in the former model employment and real wages are determined by bilateral dynamic bargaining between firms and workers in the latter model employment and real wages are determined instead by the dynamic optimization of households within the competitive market framework we estimate each model using aggregate japanese data our results show that the data are consistent with the efficient long term contract model but are inconsistent with the intertemporal substitution model a business cycle phenomenon is typically found in time series data on employment and real wages according to the data of almost all developed countries employment fluctuations are considerably greater than wage fluctuations many recent economic studies have attempted to explain this phenomenon most of these studies fall into the equilibrium business cycle theory in which business cycles are the result of individual agents optimizing in a competitive environment among the most famous early examples of such a theory are the rational expectations general equilibrium models of lucas 1972 and barro 1976 which stress the role of nominal shocks in the presence of imperfect information more recently the predominant equilibrium business cycle theory has been the real business cycle model of kydland and prescott 1982 long and plosser 1983 and king and plosser 1984 which emphasizes the importance of real shocks to production technology real business cycle theory considers a model economy populated by a single infinitely lived individual with given initial resources production possibilities and tastes the representative individual chooses a preferred consumption production plan and the resulting allocation is pareto optimal the implications of real business cycle theory are thus derived from the pareto optimal equilibrium allocation as calculated from the planning problem of a social planner or representative agent a policy implication of this theory is that monetary policy has no significant effect

excess sensitivity of consumption to current income liquidity constraints or myopia this paper asks whether the empirical rejection of the rational expectations permanent income hypothesis occurs because agents are myopic in the sense that the marginal propensity to consume out of transitory income is non zero or because some agents face liquidity constraints the finding that the estimate of the mpc out of transitory income is dramatically affected in both magnitude and statistical significance by the inclusion of a proxy for liquidity constraints suggests that liquidity constraints are an important part of the explanation of the observed excess sensitivity of consumption to current income la sensibilite excessive de la consommation au revenu courant contraintes sur la liquidite ou myopie ce memoire examine la question a savoir pourquoi l hypothese du revenu permanent avec anticipations rationnelles n est pas v6rifiee empiriquement est ce parce que les agents economiques sont myopes i e que leur propension marginale a consommer a partir de leur revenu transitoire n est pas nulle ou bien est ce que certains agents economiques font face a des contraintes sur leur liquidite le fait que l estimation de la propension marginale a consommer le revenue transitoire est affectee par l inclusion d une variable qui tente de capturer l importance des contraintes sur la liquidit6 tant dans l 6valuation de sa taille que dans sa signification statistique suggere que ces contraintes jouent un role important dans l explication de cette sensibilite excessive qu on observe de la consommation aux changements dans le niveau de revenu courant almost all the recent empirical tests of the rational expectations permanent income hypothesis re pih have rejected the hypothesis using a rich variety of data sets and estimation methods the empirical work indicates that the failure of the re pih is significant both statistically and quantitatively the null hypothesis in this empirical literature typically consists of the joint hypothesis that 1 agents expectations are formed rationally 2 desired consumption is determined by permanent income and 3 capital markets are perfect in the sense that agents can lend or borrow against 1 studies rejecting the re pih include blinder 1981 flavin 1981 hall and mishkin 1982 hayashi 1982 and sargent 1978 in his original paper hall 1978 did not reject the re pih decisively however flavin 1981 showed that with a minor alteration in the specification of the alternative hypothesis the re pih could be rejected using hall s test and data set bernanke 1981 studying panel data on automobile expenditures did not find evidence against the hypothesis for an extensive survey of the empirical literature on the rational expectations permanent income hypothesis see king 1983 canadian journal of economics revue canadienne d economique xviii no 1 february fevrier 1985 printed in canada imprime au canada 0008 4085 85 117 36 1 50 canadian economics association this content downloaded from 157 55 39 17 on wed 31 aug 2016 05 08 58 utc all use subject to http about jstor org terms

sectoral patterns of technical change towards a taxonomy and a theory abstract the purpose of the paper is to describe and explain sectoral patterns of technical change as revealed by data on about 2000 significant innovations in britain since 1945 most technological knowledge turns out not to be information that is generally applicable and easily reproducible but specific to firms and applications cumulative in development and varied amongst sectors in source and direction innovating firms principally in electronics and chemicals are relatively big and they develop innovations over a wide range of specific product groups within their principal sector but relatively few outside firms principally in mechanical and instrument engineering are relatively small and specialised and they exist in symbiosis with large firms in scale intensive sectors like metal manufacture and vehicles who make a significant contribution to their own process technology in textile firms on the other hand most process innovations come from suppliers these characteristics and variations can be classified in a three part taxonomy based on firms 1 supplier dominated 2 production intensive 3 science based they can be explained by sources of technology requirements of users and possibilities for appropriation this explanation has implications for our understanding of the sources and directions of technical change firms diversification behaviour the dynamic relationship between technology and industrial structure and the formation of technological skills and advantages at the level of the firm the region and the country

systems thinking market failure and the development of innovation policy the case of australia innovation policy is increasingly informed from the perspective of a national innovation system nis but despite the fact that research findings emphasize the importance of national differences in the framing conditions for innovation policy prescriptions tend to be uniform justifications for innovation policy generally relate to notions of market failure that are applicable in all nations in all conditions in this paper we develop a broad framework for nis analysis involving free market coordination and complex evolutionary system approaches within this framework we explore the evolving relationship between market failure and systems approaches to innovation policy in the case of australia drawing on information and analysis collected for a major review of australia s nis and the government s 10 year plan in response to it we show how the free market trajectory of policy making of past decades is being extended complemented and refocused by new approaches to complex evolutionary system thinking these approaches are shown to emphasize the importance of systemic connectivity evolving institutions and organizational capabilities nonetheless despite the fact that there has been much progress in this direction in the australian debate the predominant logic behind policy choices still remains one of addressing market failure and the primary focus of policy attention continues to be science and research rather than demand led approaches we discuss how the development and elaboration of notions of systems failure rather than just market failure can further improve policy making in the future

the observational implications of labor contracts in a dynamic general equilibrium model economies are studied where labor contracts even without changing real allocations can make equilibria appear different one basic example is that wage observations generated by long term employment contracts are biased measures of theoretical market wages this idea is analyzed in a dynamic stochastic economic model including both overlapping generations of finite lived workers and infinite horizon employers so that the implications for business cycle life cycle and cross sectional phenomena can be explicitly addressed understanding contracts in this way potentially allows us to reconcile several ostensibly anomalous aspects of the data with equilibrium theory

analyzing the functional dynamics of technological innovation systems a scheme of analysis various researchers and policy analysts have made empirical studies of innovation systems in order to understand their current structure and trace their dynamics however policy makers often experience difficulties in extracting practical guidelines from studies of this kind in this paper we operationalize our previous work on a functional approach to analyzing innovation system dynamics into a practical scheme of analysis for policy makers the scheme is based on previous literature and our own experience in developing and applying functional thinking it can be used by policy makers not only to identify the key policy issues but also to set policy goals

a new test of the three moment capital asset pricing model this paper tests the kraus litzenberger 1976 three moment capital asset pricing model using hansen s 1982 generalized method of moments gmm the gmm approach does not impose strong distributional assumptions on the asset returns this is an interest ing issue since there is no obvious multivariate distribution for returns that also exhibits co skewness using monthly stock returns to test the model there is some evidence that systematic skewness is priced

estimation of the optimal futures hedge standard approaches to designing a futures hedge often suffer from two major problems first they focus only on minimizing risk so no account is taken of the impact on expected return second in estima ting the hedge ratio no allowance is made for time variation in the distribution of cash and futures price changes this paper describes a technique for estimating the optimal futures hedge that corrects these problems and illustrates its use in hedging treasury bonds with t bond futures copyright 1988 by mit press

financial markets and wages we study a labor market equilibrium model in which flrms sign optimal long term contracts with workers firms that are flnancially constrained ofier an increasing wage proflle they pay lower wages today in exchange of higher wages once they become unconstrained and operate at a larger scale in equilibrium constrained flrms are on average smaller and pay lower wages in this way the model generates a positive relation between flrm size and wages using data from the national longitudinal survey of youth nlsy we show that the key dynamic properties of the model are supported by the data jel classiflcation g31 j31 e24

collective efficiency growth path for small scale industry this study is concerned with the growth of small local industry in developing countries and explores one particular route for understanding and fostering such growth it focuses on the clustering of firms and the competitive advantage which they derive from local external economies and joint action captured in the concept of collective efficiency following a conceptual discussion the article explores the economic and institutional conditions which enhance or hinder collective efficiency this includes a case study which suggests that responding to opportunity and crisis requires shifting from mere reliance on external economies to joint action and from ascribed to earned trust

intertemporal substitution in labor supply evidence from micro data the sensitivity of the supply of labor to intertemporal variation in the wage is an important issue in macroeconomics the analysis of social security and pensions and the study of life cycle patterns of work this paper explores two approaches to the measurement of intertemporal substitution that have appeared in the literature the first approach is to use consumption to control for wealth and unobserved expectations about future wages in the labor supply equation the second approach is to estimate a first difference equation for hours in which labor supply from the previous period serves as a control for wealth and wage expectations the results indicate that intertemporal substitution elasticity for married men is positive but small

reconceptualising the policy mix for innovation abstract recent years have seen the emergence take up and use of the term policy mix by innovation policy makers and by policy analysts and scholars alike imported from economic policy debates the term implies a focus on the interactions and interdependencies between different policies as they affect the extent to which intended policy outcomes are achieved however the meaning of the term remains ambiguous nonetheless we argue that the emergence of the policy mix concept into common use in the field of innovation policy studies provides us with a window of opportunity to reconsider some basic and often hidden assumptions in order to better deal with a messy and complex multi level multi actor reality we draw upon a range of literatures to re conceptualise the basic building blocks of innovation policy studies in order to arrive at a useful definition of policy mix tensions and interactions of different kinds across a series of dimensions we suggest that this reconceptualisation has important implications for the future scope and focus of prescriptive and analytical innovation policy studies

the structuration of socio technical regimes conceptual foundations from institutional theory abstract in recent years socio technical transitions literature has gained importance in addressing long term transformative change in various industries in order to account for the inertia and path dependency experienced in these sectors the concept of the socio technical regime has been formulated socio technical regimes denote the paradigmatic core of a sector which results from the co evolution of institutions and technologies over time despite its widespread acceptance the regime concept has repeatedly been criticized for lacking a clear operationalization as a consequence empirical applications tend to depict regimes as too monolithic and homogenous not adequately considering persistent institutional tensions and contradictions these are however crucial for assessing transition dynamics in this paper we revisit two concepts from institutional theory that enable an explicit identification of socio technical regimes and more generally a specification of the semi coherence of socio technical systems first we will show that levels of structuration can be conceptualized as degrees of institutionalization thereby treating institutionalization as a variable with different effects on actors the stability of the system and thus the potential for change secondly we draw on the institutional logics approach to characterize the content of various structural elements present in a system and to trace conflicts and contradictions between them we illustrate this approach with an empirical in depth analysis of the transformation of the australian urban water sector since the 1970ies

structural reforms and technological behaviour abstract the opening up to foreign competition the deregulation of a vast array of markets and the privatization of public sector firms have been inducing major changes in the structure and behaviour of the latin american economies the aim of this paper is to describe some of these changes and to identify the new patterns of firm behavior the new institutional environment and the new policy agenda gradually emerging in the region in the field of science and technology as a result of recent trade liberalization and market deregulation efforts

optimal hedge ratio estimation and hedge effectiveness with multivariate skew distributions this article proposes to use the three multivariate skew distributions generalized hyperbolic distribution multivariate skew normal distribution and multivariate skew student t distribution for estimating the minimum variance hedge ratio in a dynamic setting three criteria for measuring hedge effectiveness are employed hedging instrument effectiveness overall hedge effectiveness and relative to optimal hedge ratio effectiveness rhre three portfolios of spot and futures series are formed for empirical analysis the outcomes confirm that the three multivariate skew distributions are more helpful in deciding the minimum variance hedge ratio especially the generalized hyperbolic distribution than the symmetrical normal and student t distributions this outperformance is significant especially at critical market moments and it is indicated by three hedge effectiveness measures this advantage is held without the cost of lowering portfolio return in addition there is speculation possibility exist

the architecture and dynamics of industrial ecosystems diversification and innovative industrial renewal in emilia romagna the paper aims at advancing our understanding of the architecture and diversification dynamics of industrial ecosystems and identifying policies for the innovative industrial renewal of mature economies industrial ecosystems are here defined as multi tiered production systems involving heterogeneous agents operating in sectoral value chains and contributing to the capability domains of the ecosystem and its participants with closely complementary but dissimilar sets of resources and capabilities the geographical boundaries of the industrial ecosystem are shaped by the evolving interdependencies linking organisations within the ecosystem and by the new linkages consolidating beyond that thus the industrial ecosystem is a structured production space centred mainly on its productive organisations as well as other institutions intermediaries and demand side actors purposefully involved in co value creation processes along various types of diversification and innovative industrial renewal trajectories drawing on a five year research programme in the emilia romagna industrial ecosystem a number of case studies are introduced to highlight these trajectories and the underpinning structural learning dynamics the paper concludes by identifying a number of policy implications focusing on strategies for enhancing the structural readiness of the industrial ecosystem and promoting smart diversification and innovative industrial renewal policies jel classifications d20 o25 o30

a time series analysis of real wages consumption and asset returns summary this paper re examines whether the time series properties of aggregate consumption real wages and asset returns can be explained by a neoclassical model previous empirical rejections of the model have suggested that the optimal labour contract model might be appropriate for understanding the time series properties of the real wage rate and consumption we show that an optimal contract model restricts the long run relation of the real wage rate and consumption we exploit this long run restriction cointegration restriction for estimating and testing the model using ogaki and park s 1989 cointegration approach this long run restriction involves a parameter that we call the long run intertemporal elasticity of substitution ies for non durable consumption but does not involve the ies for leisure this allows us to estimate the long run ies for non durable consumption from a cointegrating regression tests for the null of cointegration do not reject our model as a further analysis our estimates of the long run ies for non durable consumption are used to estimate the discount factor and a coefficient of time nonseparability using hansen s 1982 generalized method of moments we form a specification test for our model a la hausman 1978 from these two steps this specification test does not reject our model this paper re examines whether the time series properties of aggregate consumption real wages and asset returns are consistent with a simple neoclassical representative agent economy previous empirical explorations of this issue have rejected the neoclassical model in large part because the marginal rate of substitution between consumption and leisure does not equal the real wage as is implied by the the first order conditions of the model in this paper we argue that an optimal labour contracting model is more appropriate for understanding the time series behaviour of real wages and consumption we show that a version of the optimal contract model restricts the long run relation between real wages and consumption we exploit this longrun restriction ri cointegration restriction to estimate preference parameters and test the model first we employ the cointegration approach suggested by ogaki and park 1989 to estimate the long run intertemporal elasticity of substitution for non durable consumption from a cointegrating regression we test the model by testing for the cointegration restriction

systems competition and network effects this paper discusses firm behavior market performance and the public and private institutions that arise in systems markets i e markets where consumers use compatible components together to generate benefits in such markets which include communications networks and hardware software networks popular products are inherently more valuable these network effects can drive corporate strategies and are critical in understanding innovation in many high technology markets the discussion here emphasizes the dynamics of consumer adoption decisions in the presence of network effects competition between incompatible systems and how suppliers choose which components are compatible and which are not

recovery of a mexican cluster devaluation bonanza or collective efficiency abstract mexico as many other developing countries in latin america and elsewhere has been moving in the 1980s toward a liberalized trade regime after a long period of import substitution this paper analyzes the impact of trade liberalization on the cooperative behavior of shoe firms located in a cluster in guadalajara the empirical evidence shows that cooperation has increased it also suggests that cooperation positively influences firms performance and together with a favorable market environment contributes to the cluster s recovery the study is based on fieldwork carried out in guadalajara in 1996 qualitative information was collected through in depth interviews and quantified responses came from a questionnaire survey covering a sample of 63 shoe manufacturing enterprises

market structure and competitive equilibrium in dynamic economic models abstract recently theorists have analyzed economies which potentially contain both finite and infinite horizon overlapping generations using arrow debreu complete markets typically applied models assume recursive spot and contingent securities markets implying a different equilibrium concept indeed if infinite horizon agents are present recursive equilibria cannot exist without some side conditions on debt with the right side conditions we show that every recursive market equilibrium allocation is a complete market equilibrium allocation and vice versa this bridges a gap between theory and applications and extends existing equivalence results on market structure

the economics of technical change this paper reviews the recent rapidly growing literature on technical change in the economy it concentrates on innovations and their diffusion at firm and industry level since this was the area designated as relatively weak in earlier literature surveys the review argues that the extensive empirical evidence and theoretical analysis now available presents a basic challenge to neoclassical theory after indicating some weaknesses in the neo schumpeterian literature the paper concludes by advocating an experiment with a new form of assessment by neighboring disciplines to economics itself which would take full account of the fundamental issues at stake in this modern methodenstreit c 1994 academic press inc copyright 1994 by oxford university press