interrupted work careers depreciation and restoration of human capital the quantitative effects and even the existence of a human capital depreciation phenomenon have been a subject of controversy in the recent literature prior work however was largely cross sectional and the longitudinal dimension if any was retrospective using longitudinal panel data on married women in nls we have now established that real wages at reentry are indeed lower than at the point of labor force withdrawal and the decline in wages is greater the longer the interruption another striking finding is a relatively rapid growth in wages after the return to work this rapid growth appears to reflect the restoration or repair of previously eroded human capital the phenomenon of depreciation and restoration is also visible in data for immigrants to the united states however while immigrants eventually catch up with and often surpass natives returnees from the nonmarket do not fully restore their earnings potential

does marriage really make men more productive this paper presents new descriptive evidence regarding marital pay premiums earned by white males longitudinal data indicate that wages rise after marriage and that cross sectional marriage premiums appear to result from a steepening of the earnings profile data from a company personnelfile that includes information on job grades and supervisor performance ratings reveal large marital status pay differences within a narrow range of occupations managers and professionals and environments a single firm married workers tend to be located in higher paying job grades there are very small pay differentials within grades married men receive higher performance ratings than single men as a result they are much more likely to be promoted controlling for rated performance however eliminates the promotion differential sanders korenman is an assistant professor of economics and public affairs at princeton university and is a faculty associate of the office of population research at princeton university and a research affiliate of the national bureau of economic research nber david neumark is an assistant professor of economics at the university of pennsylvania and a research affiliate of the nber korenman wishes to acknowledge the hewlett foundation and the harvard university center for population studies for financial support the authors are grateful to james medofffor making available an extract from the company personnelfile questions regarding data availability should be directed to professor james

learning by doing and the introduction of new goods a dynamic general equilibrium model is developed in which goods are valued according to the characteristics they contain the set of goods produced in any period is endogenously determined and learning by doing is the force behind sustained growth it is shown that the set of produced goods changes in a systematic way over time with goods of higher quality entering each period and those of lower quality dropping out the model is then used to study the effect of introducing a traditional sector in which there is no learning

intellectual property rights violations and spillovers in north south trade abstract the article examines the role of technological spillovers when northern and southern firms compete in quantities on the common world market and when only the northern firm is supposed to conduct innovative activity the intensity of spillovers is interpreted as an indicator of the strength of intellectual property rights ipr protection in this light the paper reconsiders the questions raised in the recent economic analysis of ipr protection in north south relations when and whether the southern countries benefit in welfare terms from protecting ipr how the north fares in this story how large is the conflict between the north and south and what is the optimal level of ipr protection at the world level the paper shows that the common belief that the south generally benefits from relaxing ipr protection while the north is worse off does not carry over in the applied duopoly model with spillovers in this respect the congruence of interests between north and south with respect to southern ipr protection regime should not be an exceptional or even impossible state of affairs

the gender gap in earnings at career entry we propose a new approach to analyzing gender differences in wages this approach identifies several alternative explanatory mechanisms to account for the sorting of women and men into different types of jobs that offer different levels of reward because labor market rewards derive from labor market positions we study matching processes operating at the micro level that sort workers into existing slots in a given macro level structure of jobs and associated wages we focus on the explanation of gender differences in wages at career entry analyzing data from the national longitudinal survey of youth collected between 1979 and 1991 we find that at career entry women earn 84 cents for every dollar men earn gender differences in worker characteristics account for only about 30 percent of this wage gap gender differences in occupational aspirations have the most important effect accounting for 16 percent of the wage gap and gender differences in job related skills and credentials account for about 14 percent of the wage gap gender differences in adult family roles have little direct effect our analysis further suggests that the external influences of employing organizations and network processes on gender differences in occupational and industrial placement at career entry account for another 42 percent of the wage gap t is well established that in the united states on average women s wages are lower than those of men data on the 1992 annual earnings of full time year round workers ages 16 and older indicate that on average women earned 71 cents for every dollar earned by men u s bureau of the census 1993 we analyze gender differences in wages at career entry when market con

international outsourcing and factor prices with multistage production we develop a dual representation of the technology of international fragmentation for an industry using 2 factors in a continuum of stages we then derive a generalised factor price frontier which incorporates an endogenous adjustment of the margin of fragmentation using this frontier in a 2 2 general equilibrium model we investigate the role of outsourcing in the adjustment to a decline in the final output price of the multistage industry and the attendant factor price effects we also explore the implications of an improved technology of international fragmentation on the margin of fragmentation and on domestic factor prices

a strategic approach to the product life cycle abstract this paper analyzes the steady state open loop nash equilibrium of a game in which a northern monopolist devotes resources to new product development and a southern planner diverts resources into reverse engineering to learn the technology to produce these a steady state equilibrium technology gap exists showing that a constant technology gap over time may be explained by optimal strategic behavior of decision makers in a product cycle model given resource costs neither the northern monopolist nor the southern planner wants to alter the gap finally analysis of comparative steady states shows the importance of strategic versus non strategic behavior

incomplete contracts and the product cycle the incomplete nature of contracts governing international transactions limits the extent to which the production process can be fragmented across borders in a dynamic general equilibrium ricardian model of north south trade the incompleteness of international contracts is shown to lead to the emergence of product cycles because of contractual frictions goods are initially manufactured in the north where product development takes place as the good matures and becomes more standardized the manufacturing stage of production is shifted to the south to benefit from lower wages following the property rights approach to the theory of the firm the same force that creates product cycles i e incomplete contracts opens the door to a parallel analysis of the determinants of the mode of organization the model gives rise to a new version of the product cycle in which manufacturing is shifted to the south first within firm boundaries and only at a later stage to independent firms in the south relative to a world with only arm s length transacting allowing for intrafirm production transfer by multinational fi rms is shown to accelerate the shift of production towards the south while having an ambiguous effect on relative wages the model delivers macroeconomic implications that complement the work of krugman 1979 as well as microeconomic implications consistent with the findings of the empirical literature on the product cycle

intellectual property rights and foreign direct investment abstract this paper develops a product cycle model with endogenous innovation imitation and foreign direct investment fdi we use this model to determine how stronger intellectual property rights ipr protection in the south affects innovation imitation and fdi we find that stronger ipr protection keeps multinationals safer from imitation but no more so than northern firms instead the increased difficulty of imitation generates resource wasting and imitation disincentive effects that reduce both fdi and innovation the greater resources absorbed in imitation crowd out fdi reduced fdi then transmits resource scarcity in the south back to the north and consequently contracts innovation

intellectual property rights licensing and innovation in an endogenous product cycle model abstract we develop a dynamic general equilibrium model of the product cycle to study the effects of stronger intellectual property rights iprs in the south on the incentives of firms in the north to innovate and to license advanced technologies innovation and licensing are random processes requiring resources stronger iprs increase the licensor s share of rents and reduce the costs of licensing contracts thus the returns to both licensing and innovation would rise while additional resources would be available for r d in consequence innovation and technology transfer would rise however the effect of stronger iprs on relative wages between regions is ambiguous

heterogeneous technologies strategic groups and environmental efficiency technology gaps for european countries abstract this paper measures technology tg and environmental efficiency technology gaps eetgs in 25 european countries over two distinct periods 2002 and 2008 examining the possible effect of adopted environmental regulations and the kyoto protocol commitments on environmental efficiency technology gaps however the introduction of the metafrontier in our analysis puts into our discussion the role of heterogeneous technologies and its effect on the above mentioned measures employing a directional distance function we investigate whether there is an actual difference in terms of environmental efficiency and efficiency performance among european countries considering the technological frontiers under which they operate the construction of individual frontiers has been realized employing a large number of variables that are highly correlated with countries learning and absorbing capacity new technological knowledge and using economic theory and classical frontier discrimination like developed vs developing north vs south and participation in the eurozone or not the overall results indicate a crucial role of heterogeneous technologies for technology gaps in both periods moreover a significant decrease for both measures although in different percent has been recorded emphasizing the key role of knowledge spillovers

spiders and snakes offshoring and agglomeration in the global economy abstract global production sharing is determined by international cost differences and frictions related to the costs of unbundling stages spatially the interaction between these forces depends on engineering details of the production process with two extremes being snakes and spiders snakes are processes whose sequencing is dictated by engineering spiders involve the assembly of parts in no particular order this paper studies spatial unbundling as frictions fall showing that outcomes are very different for snakes and spiders even if they share some features both snakes and spiders have in common a property that lower frictions produce discontinuous location changes and overshooting parts may move against their comparative costs because of proximity benefits and further reductions in frictions lead these parts to be reshored predictions for trade volumes and the number of fragmented stages are quite different in the two cases for spiders a part crosses borders at most twice the value of trade increases monotonically as frictions fall except when the assembler relocates and the direction of parts trade is reversed for snakes the volume of trade and number of endogenously determined stages is bounded only by the fragmentation of the underlying engineering process and lower frictions monotonically increase trade volumes

the production life cycle tasks in production have different dynamics in comparison with individual products we build a general equilibrium model where three forces offshoring learning and wage interact to determine how production fragmentation evolves over time we show that the production process follows a life cycle its fragmentation emerges deepens and converges our model is stylized and versatile which can be used to tractably characterize the loci of global output productivity welfare and value added distribution as production fragmentation progresses this article is protected by copyright all rights reserved

price as a stimulus to think the case for willful overpricing consumers aware of a new benefit will often experience uncertainty about its personal relevance or usage value this paper shows that the decision to deliberate further to resolve this uncertainty and reach a polarized judgment of personal relevance critically depends on the posted price in particular a price above the consumer s initial willingness to pay might be thought provoking and enhance the perception of relevance with a certain probability this behavioral mechanism is introduced formally and by way of an experiment with reference to the purchase of organic lettuce and fair trade coffee accounting for the effect of price as a stimulus to think a monopolistic firm should either over price transgressive pricing or under price regressive pricing in comparison to the consumer s willingness to pay under certain circumstances the firm should also empower consumers with means that reduce the effort of deliberation

can globalisation stop the decline in commodities terms of trade in this paper we address the following question would a fully integrated world economy eliminate the widely reported decline in the terms of trade of primary commodities we address the question by looking at the terms of trade within the us a highly integrated economy our findings show two results first us internal real commodities terms of trade over the 1947 1998 period experienced slowly declining but significant trends second once we control for the effect of us prices on international terms of trade we find a long run relationship between the us and international relative prices these findings support the view that the decline of commodities terms of trade bears no relationship with the process of globalisation this seems to indicate that if world terms of trade behaved as the us terms of trade neither increased integration nor protectionist measures would eliminate this trend

a model for valuing new technologies under a pull incentives environment abstract investment in innovation and research development r d projects is one of the key strategies that firms need to implement to enhance growth increase profitability and create value on the other hand r d projects are characterized by significant levels of risk due to limited information and uncertainty over both the investment costs and the expected returns in order to encourage the development of high risk but relevant r d projects some risks can be mitigated by other project stakeholders through the use of pull incentives such as a minimum guaranteed demand in this article we propose an adaptation of a real option model for valuing r d projects where we incorporate a pull incentive for the final product using a market sales function that decreases in time and is strictly positive over the product s life cycle we apply this model to the case of the development of a power line communication modem plc for smart grids in the brazilian electricity market where a power utility firm agreed to bear part of the development risk by means of a minimum guaranteed demand and solve using monte carlo simulation the results suggest that this guarantee has significant impact on the project value which is not captured by traditional valuation methods or even real option methods that do not incorporate this concept

the socioeconomic determinants of ill gotten gains within person changes in drug use and illegal earnings generalizing from the sociology of earnings attainment we develop a conceptual model of social embeddedness in conventional and criminal activities to explain illegal earnings among criminal offenders to isolate the effects of time varying factors such as legal earnings drug use and criminal opportunities we use data from the national supported work demonstration project to estimate fixed effects models predicting month to month changes in illegal earnings we find that criminal earnings are sensitive to embeddedness in conforming work and family relationships criminal experience and the perceived risks and rewards of crime moreover heroin and cocaine use creates a strong earnings imperative that is difficult to satisfy in the low wage labor market and offenders earn far more money illegally when they are using these drugs than during periods of abstinence

technological innovations capital mobility and the product cycle innorth south trade this paper constructs a general equilibrium model of north south tradein which the north continually introduces new goods the rate at whichtechnology diffuses to the south is a function of differences in the cost of production in the two regions the key result of the model is that labor force growth in the south initially increases real wages inthe north a standard result in classical trade models but in the long run reduces northern wages by accelerating the transfer of technology and drawing capital out of the north as well copyright 1986 by american economic association

appropriate technology in a model of multinational duopoly this paper seeks to motivate the observed tendency of multinationals with home bases in ldcs to adopt labour intensive technology relative to their counterparts in industrial countries two multinationals play a spatial duopoly game in which the location mode of market service exports or on site production and technology choice of the third world multinational are simultaneously determined the model is calibrated using observed data on transport costs factor shares research intensity and international income distribution ldc firms are shown to prefer labour intensive technological adaptation even when the option of producing on site in high income markets is available

the narrow moving band the dutch disease and the competitive consequences of mrs thatcher notes on trade in the presence of dynamic scale economies abstract this paper presents a model of trade in which comparative advantage instead of being determined by underlying attributes of countries evolves over time through learning by doing in this model arbitrary patterns of specialization once established tend to become entrenched over time the model sheds light on three widely held views that do not make sense in more conventional models first is the view that temporary protection of selected sectors can permanently alter the pattern of comparative advantage in the protecting country s favor second is the view that seemingly favorable developments such as the discovery of exportable natural resources may lead to a permanent loss of other sectors and reduce welfare in the long run third is the possibility that a temporary overvaluation of a currency due to tight money can lead to a permanent loss of competitiveness in some sectors

scale economies wage differentials and north south trade abstract this paper attempts to isolate the effect of external economies of scale in production on the pattern of north south trade the results show that when the relative wage is higher in the north and only the north innovates the south produces and exports those goods with the lowest economies of scale while the remaining set of goods is produced and exported by the north production subsidies offered by the south raise southern income and welfare but if the north introduces a new set of goods the benefits of the subsidies to the south dissolve

why do some occupations pay more than others social closure and earnings inequality in the united states1 this article elaborates and evaluates the neo weberian notion of social closure to investigate positional inequality in the united states it argues that social and legal barriers around occupations raise the rewards of their members by restricting the labor supply enhancing diffuse demand channeling demand or signaling a particular quality of service hypotheses derived from the closure perspective are evaluated using new data that map five institutionalized closure devices licensing educational credentialing voluntary certification association representation and unionization onto 488 occupations results from multilevel models demonstrate that closure practices particularly those that generate tangible restrictions on the labor supply shape the contemporary structure of occupational earnings returns to these strategies vary across occupations but are not tightly linked to the complexity of the occupation s knowledge base if suitably elaborated closure theory thus offers a promising complemen

offshoring along the production chain recent contributions on offshoring often assume that firms can freely split their production process into separate steps which can be ranked according to the cost savings from producing abroad we replace this assumption by the notion of a technologically determined sequence of production steps in our model cost savings from offshoring fluctuate along the production chain and moving unfinished goods across borders causes transport costs we show that in such a setting firms may refrain from offshoring even if relocating individual steps would be advantageous conversely small variations in model parameters may lead to a large increase in offshoring activities

modeling choice strategies for noncomparable alternatives theoretical models are developed for two strategies consumers use to choose among noncomparable alternatives the models view consumers as trading off decision error and processing effort when selecting a decision strategy the models predict the use of choice strategies and implicit abstraction processes for noncomparable alternatives in a number of different circumstances

intellectual property piracy in a north south context empirical evidence the protection of intellectual property rights ipr has been a contentious issue for more than 20 years industrialized nations have moved to knowledge based economies and simultaneously trade barriers have fallen making intellectual property ip vulnerable adding to this vulnerability are conflicting international institutional environments belief systems and economic realities the debate over ipr protection has become a significant global trade issue pitting the net technology producing north against the net technology consuming south with this in mind there has been much debate about the impact of alternative ipr regimes tight or loose on the welfare of southern economies policy makers in both the south and the north search for arguments to convince recalcitrant southern countries to follow the northern model of strict ipr regimes the south faced with a dilemma searches for arguments to justify looser regimes or convince its populace that tighter regimes are in the best interest of the nation the objective of this research is to add empirical clarity about the welfare impacts of weak ipr on the firm and host country to this end we employ a novel methodological design and unique context the research design is deductive in that we use the empirical setting of pioneer argentina s a a seller of bioengineered agricultural seeds to test the existing theory of weak ipr impacts in a north south context

quality ladders and product cycles we develop a two country model of endogenous innovation and imitation in order to study the interactions between these two processes firms in the north race to bring out the next generation of a set of technology intensive products each product potentially can be improved a countably infinite number of times but quality improvements require the investment of resources and entail uncertain prospects of success in the south entrepreneurs invest resources in order to learn the production processes that have been developed in the north all r d investment decisions are made by forward looking profit maximizing entrepreneurs the steady state equilibrium is characterized by constant aggregate rates of innovation and imitation we study how these rates respond to changes in the sizes of the two regions and to policies in each region to promote learning

a decision theoretic model of innovation technology transfer and trade we analyse a dynamic north south model of innovation technology transfer and trade northern firms conduct r d using labour which has alternative uses producing in the r d sector or a nontraded good sector since technology transfer prevents the north from fully appropriating benefits of r d the optimal rate of innovation for either profit maximizing firms or a utility maximizing northern planner is less than globally optimal an increased transfer rate intensifies competition of lower wage southern workers with northern workers in production so profit maximizing northern firms irrespective of their number or cooperation in r d reallocate labour toward r d

consumer choice strategies for comparing noncomparable alternatives research on consumer choice has focused on easily comparable alternatives a subset of the choices consumers regularly face this paper outlines the problem and two general strategies for comparing noncomparable alternatives a subset of choices that has been overlooked in the literature experiments are reported that support use of the strategies

where ricardo and mill rebut and confirm arguments of mainstream economists supporting globalization most noneconomists are fearful when an emerging china or india helped by their still low real wage rates outsourcing and miracle export led developments cause layoffs from good american jobs this is a hot issue now and in the coming decade it will not go away prominent and competent mainstream economists enter into the debate to educate and correct warm hearted protestors who are against globalization here is a fair paraphrase of the argumentation that has been used recently by alan greenspan jagdish bhagwati gregory mankiw douglas irwin and economists john or jane doe spread widely throughout academia yes good jobs may be lost here in the short run but still total u s net national product must by the economic laws of comparative advantage be raised in the long run and in china too the gains of the winners from free trade properly measured work out to exceed the losses of the losers this is not by mysterious fuzzy magic but rather comes from a sharing of the trade induced rise in total global vectors of the goods and services that people in a democracy want never forget to tally the real gains of consumers alongside admitted possible losses of some producers in this working out of what schumpeter called creative capitalist destruction correct economic law recognizes that some american groups can be hurt by dynamic free trade but correct economic law vindicates the word creative destruction by its proof sic that the gains of the american winners are big enough to more than compensate the losers

putting things in order trade dynamics and product cycles we develop a procedure to rank order objects using censored panel data sets we illustrate this by ranking countries and commodities using disaggregated american import data and find evidence that

on the number and size of nations this paper studies the equilibrium determination of the number of countries in different political regimes and in different economic environments with more or less economic integration we focus on the trade off between the benefits of large jurisdictions and the costs of heterogeneity of large and diverse populations our model implies that i democratization leads to secessions ii in equilibrium one generally observes an inefficiently large number of countries iii the equilibrium number of countries is increasing in the amount of economic integration

product and process innovation in the product life cycle estimates for u s manufacturing industries many theoretical analyses of international trade focus on the effects and endogenous determination of product innovation technology transfer and product obsolescence despite these theoretical innovations few direct tests of the empirical power of product cycle models have been conducted although a number of studies have examined general relationships between trade and innovation usually measured by expenditures on research and development rd and then estimate these predictions using data for eleven two digit manufacturing industries in the united states during the period from 1974 to 1988 the distinction between productand process oriented technological change is important because it yields predictions that aid in assessing the power of the product cycle models most empirical studies aggregate productand process oriented technological change with the notable exceptions of the studies of productivity growth by link 22 and terlecky 31

product cycles and market penetration this paper constructs a quality ladders product cycle model with multiple quality levels a lower quality level of each product sells due to differences in willingness to pay for quality across consumers the model determines how far southern firms penetrate high technology product markets expanded resources or weakened protection of intellectual property rights in the south relative to the north lead to increased southern market penetration as observed with east asian countries either cause of increased southern market penetration implies a reduction in the wage in the north relative to the south and a reduction in the rate of innovation copyright 1997 by economics department of the university of pennsylvania and the osaka university institute of social and economic research association

moving up or moving out a unified theory of r d fdi and trade abstract this paper introduces industrial heterogeneity in r d productivity into the quality ladder model of the north south trade to study how firms choices made between r d and foreign direct investment fdi vary across industries and how such choices consequently determine the evolution of comparative advantage and trade it shows that trade reveals product cycle dynamics in medium tech industries but remains static in others high tech industries experience continued innovation in the north with no migration of product lines medium and low tech industries migrate south via fdi to exploit low production costs with the south then replacing the north as the dominant exporter however medium tech industry production eventually shifts back to the north when superior products are marketed by northern innovators making the end of one complete product cycle and the start of the next because of marginal r d productivity the relocated low tech industries are not presented with the option of moving up and thus stagnate