an examination of the antecedents and implications of patent scope this paper focuses on the concept of patent scope and contributes to existing research in three ways first it offers a re examination of the construct and identifies two dimensions of patent scope 1 the number of variations of the core inventive idea identified in the patent reflected in the number of claims in the patent e g merges and nelson 1994 and 2 the positioning of those variations in the inventive space which is reflected in the number of technological classes in which patent examiners classify those claims second it investigates the implications of patent scope for the firm s subsequent inventive performance and finds that when the scope of a patents spans across a higher number of technological classes the extent to which the inventing firm itself succeeds in building on the knowledge underlying its own patent is lower third it investigates the antecedents of scope and suggests that prior investment in scientific knowledge and in related inventive experience are two factors that affect the scope of the patents that firms develop the theoretical predictions elaborated in this paper are supported by an empirical examination of a longitudinal sample of firms in the photonics industry

towards an attention based view of the firm the central argument is that firm behavior is the result of how firms channel and distribute the attention of their decision makers what decision makers do depends on what issues and answers they focus their attention on what issues and answers they focus on depends on the specific situation and on how the firm s rules resources and relationships distribute various issues answers and decision makers into specific communications and procedures the paper develops these theoretical principles into a model of firm behavior and presents its implications for explaining firm behavior and adaptation 1997 by john wiley sons ltd

optimal lot sizing for an unreliable production system based on net present value approach abstract the paper considers the net present value npv approach to determine the economic manufacturing quantities for an unreliable production system over an infinite planning horizon the npv of the expected total cost is obtained under general failure time and general repair time distributions and its asymptotic characteristics are examined by perturbation of the instantaneous discount rate the criteria for the existence and uniqueness of the optimal production time lot size are derived under exponential failure and constant zero repair time the performance of the npv model is compared with the traditional long run average cost model in terms of the npv of the expected total cost based on the optimal decisions of the two models from numerical experiments it is observed that the decision based on the average cost can be 10 worse than the decision based on the npv depending upon the machine failure rate

determining optimal lot size for a two warehouse system with deterioration and shortages using net present value abstract in this paper we develop a deterministic inventory model for deteriorating items with two warehouses by minimizing the net present value of the total cost deterioration rates of items in the two warehouses may be different in addition we allow for shortages and complete backlogging we then prove that the optimal replenishment policy not only exists but also is unique under some condition further the result reveals that the reorder interval based on the average total cost if it exists must be longer than that derived using net present value finally we use yang s h l yang european journal of operational research 157 2004 344 356 numerical example to illustrate the model and conclude the paper with suggestions for possible future research

general technological capabilities product market fragmentation and markets for technology abstract the combination of a firm capability i e ability to generate general purpose technologies and a market structure condition i e fragmentation of downstream submarkets may encourage licensing in an industry that is the probability of licensing should increase when product markets are fragmented and technologies support general purposes evidence consistent with these predictions emerges from a 1993 to 2001 panel of 87 firms that owned at least one u s software security patent between 1976 and 2001 the analysis uncovers some fundamental characteristics of how external knowledge exploitation functions in particular technology markets thrive when product markets are fragmented and firms have the capability to produce general technologies

global and domestic utilization of industrial relevant science patent citation analysis of science technology interactions and knowledge flows abstract the development of science based technologies may draw heavily on codified and tacit outputs from both domestic research bases and foreign sources having a view of the scientific underpinnings of these technical innovations and related knowledge diffusion and utilization processes especially those concerning public financed basic research is of major importance to policymakers nowadays some of those scientific and technical inputs are pivotal to technical inventions and are acknowledged as such by explicit references citations to related research papers in the reference list on the corresponding patents this case study deals with citations to dutch authored research papers on uspto patents granted during the period 1987 1996 results of the citation analysis reveal several important features of contributions made by the dutch science base to dutch invented and or foreign invented patents such as 1 a marked overall increase of patent citations to dutch research papers and 2 significant differences between domestic and foreign citation patterns where 3 domestic citation links are dominated by author inventor self citations and patents originating from the large r d intensive multinational firms such as philips these findings provide new empirical evidence that patent citation analysis produces systemic quantitative data providing strategic background information regarding nation specific and sector specific factors in domestic and cross border science technology linkages and knowledge flows

the changing technology of technological change general and abstract knowledge and the division of innovative labour abstract in the past most innovations have resulted from empiricist procedures the outcome of each trial yielding knowledge that could not be readily extended to other contexts while trial and error may remain the primary engine of innovation developments in many scientific disciplines along with progress in computational capabilities and instrumentation are encouraging a new approach to industrial research instead of relying purely on trial and error the attempt is also to understand the principles governing the behaviour of objects and structures the result is that relevant information whatever its source can now be cast in frameworks and categories that are more universal the greater universality makes it possible for the innovation process to be organised in new ways firms can specialise and focus upon producing new knowledge and the locus of innovation may be spread across both users and producers more generally the use of general and abstract knowledge in innovation opens up the possibility for a division of labour in inventive activity the division of innovative labour the implications for public policy especially that on intellectual property rights are discussed

patent quality and research productivity measuring innovation with multiple indicators we analyse the determinants of the decline in research productivity using panel data on manufacturing firms in the us for the period 1980 93 we focus on three factors the level of demand the quality of patents and technological exhaustion we develop an index of patent quality using detailed patent information and show that using multiple indicators substantially reduces the measured variance in quality research productivity at the firm level is inversely related to patent quality and the level of demand as predicted by theory and patent quality is positively associated with the stock market value of firms

individual demands from household aggregates time and age variation in the composition of diet this paper uses non parametric regression with smoothness induced by imposition of a roughness penalty to estimate time dependent relationships between age and intakes of energy total fat and saturated fatty acids employing data on household food acquisitions from a continuous survey covering the period 1975 94 a discrete analogue of the bivariate thin plate spline smoother is used to smooth the estimates across age and time with age and calendar time specific estimated intakes in hand it is possible to track changes with age within cohorts of particular interest in this application are estimates of the change through time and across age in measures of dietary composition which figure in many governments dietary targets such as the proportion of energy derived from fat the method used here can be applied in any situation in which household aggregate data are available on consumption of private goods and there is a need to model the demands of household members or to control for household composition opening the way to the construction of individual pseudo panels from household aggregates 1998 john wiley sons ltd

supply chain networks with corporate financial risks and trade credits under economic uncertainty abstract the focus of this paper is to provide an analytical framework which can be used to investigate how financial risks affect the values of interconnected supply chain firms from a network perspective and how financial risks affect the supply chain firms profitability as well as the cash and credit transactions in particular we develop a variational inequality equilibrium model in conjunction with capital asset pricing model capm and the net present value npv to determine the optimal supply chain prices profits and implicit equity values of supply chain firms under financial risks and economic uncertainty we illustrate the analytical framework with computational studies which yield interesting managerial implications to the following questions 1 how do financial risks and economic uncertainty affect the values of interconnected supply chain firms from a network perspective 2 how do financial risks and economic uncertainty affect the supply chain firms profitability as well as the cash and credit transactions 3 how does the effect of financial risks change under different competition scenarios

the saving of the elderly in micro and macro data examination of household micro data on the elderly has generally concluded that they do not dissave significantly whereas estimates using aggregate macro data have shown that the presence of a large elderly population leads to a lower saving rate this paper shows that if interactions between generations are important one would not expect these estimates to be the same the paper presents new evidence that bequests are plausibly the source of this discrepancy examination of data from young households that have received or expect bequests confirms that bequests are indeed an important factor determining the saving of the young

fortune favors the prepared firm a critical factor in industrial competitiveness is the ability of firms to exploit new technological developments we term this ability a firm s absorptive capacity and argue that such a capability not only enables a firm to exploit new extramural knowledge but to predict more accurately the nature of future technological advances we develop a stylized model in which we focus exclusively on firms decisions to invest in their absorptive capacities we first examine a monopolist s investment decision analyzing the path dependence of its investment and the effect of uncertainty we then consider the effect of competition by modeling the impact of entry on an incumbent s investment behavior implications for management and public policy are then discussed

appropriability and commercialization evidence from mit inventions the effects of appropriability on invention have been well studied but there has been little analysis of the effect of appropriability on the commercialization of existing inventions exploiting a database of 805 attempts by private firms to commercialize inventions licensed from the massachusetts institute of technology mit between 1980 and 1996 we explore the influence of several appropriability mechanisms on the commercialization and termination of projects to develop products based on university inventions our central hypothesis is that the relationship between a licensee s decision to either terminate or commercialize the invention is driven by the current market value of the invention as well as the option value of delaying its commercialization we use a competing risks framework that allows for nonparametric heterogeneity and correlated risks we find that better appropriability in the sense of more effective patent strength and secrecy has a strong negative effect on the hazard of license termination the effectiveness of learning has a strong positive effect on the hazard of technology commercialization while lead time has a negative effect

98 effective integer ratio lot sizing for one warehouse multi retailer systems a warehouse supplies n retailers constant external demand occurs at each retailer and shortages are not allowed there are linear holding costs and fixed costs for ordering at the warehouse and at each retailer the goal is to minimize the long run average cost over an infinite time horizon we define a new class of policies for this problem whose simple structure facilitates both computation and implementation the cost of a policy that is optimal within this class is shown to be within 2 of the cost of an optimal policy for the original problem in the worst case such a policy can be computed in on log n time

growth and saving among individuals and households the lifecycle theory of saving and consumption predicts that changes in an economy s rate of economic growth will affect its aggregate saving rate by changing the lifetime resources of younger people relative to older people however studies that track the saving behavior of cohorts of household heads over time as they age have yielded estimates of age saving profiles that are too flat for growth to have much effect on the aggregate saving rate one problem with the cohort approach is that multigenerational households are common in many counties and the age saving profiles of households may be quite different from the age saving profiles of individuals that make up households in this paper we propose a method for estimating individual age saving profiles using household data this method is applied to data from taiwan and thailand we find that the individual method yields results that are more favorable to the lifecycle model these results imply that changes in the rate of economic growth may in som

why do firms do basic research with their own money abstractthe question to be addressed is why do private firms perform basic research with their own money interest in this question derives from both analytical and utilitarian considerations there is empirical evidence in the united states which provides the main context for this paper supporting the view that basic research makes a significant contribution to the productivity growth of the economy 4 7 it is widely held that social returns from basic research are significant and higher than private returns and it is for this reason that most such activities continue to be financed by the taxpayer this also implies that measures aimed at increasing basic research by the private sector will be welfare improving in the united states the federal government in the years since the second world war has provided the vast majority of all funds devoted to basic research although the federal share has been declining in recent years and although that share is at its lowest level in about 20 years it still constitutes about two thirds of the total 10 this abstract was borrowed from another version of this item

optimal ordering policies under conditions of extended payment privileges this paper develops optimal order quantities for firms that are offered a one time opportunity to delay payment for an order of a commodity such delayed payments result in a reduction of the effective purchase cost which is a function of the return available on alternative investments the number of units of the commodity ordered and the length of the extended period optimal order quantities are developed for extended payment privileges that occur at a reorder point of between reorder points six suppliers extended payment scenarios are evaluated a simulation analysis is conducted to determine the sensitivity of derived models to changes in the various input parameters the simulation with realistic parameter values reveals that the additional discounted order quantity is insensitive to large changes in the ordering cost and unit price sensitive to changes in the carrying cost and return rate of funds but without significantly affecting the total cost and extremely sensitive to the annual demand

look before you leap market opportunity identification in emerging technology firms entrepreneurs play a fundamental role in bringing new technologies to market because technologies are often configurable to serve a variety of different markets it is possible for entrepreneurs to identify multiple market opportunities prior to the first market entry of their emerging firms and if they elect to do so to therefore have a choice of which market to enter first the empirical results presented in this paper offer three new insights regarding this important early stage choice in new firm creation first they reveal that serial entrepreneurs have learned through prior start up experience to generate a choice set of alternative market opportunities before deciding which one to pursue in their new firm creation second the analysis indicates that entrepreneurs who identify a choice set of market opportunities prior to first entry derive performance benefits by doing so third the positive relationship between the number of market opportunities identified prior to first entry and new firm performance is nonlinear and subject to decreasing marginal return the research literature has yet to acknowledge the notion of multiple opportunity identification prior to entry and the related idea of selecting the most favorable market opportunity for the creation of a new technology firm

inventory models with variable lead time and present value the figures for inventory make up a huge proportion of a company s working capital because of this we formulated the optimal replenishment policy considering the time value of money to represent opportunity cost in this article we provide a mixed inventory model in which the distribution of lead time demand is normal to consider the time value first the study tries to find the optimal reorder point and order quantity at all lengths of lead time with components crashed to their minimum duration secondly we develop a method to insure the uniqueness of the reorder point to locate the optimal solution finally some numerical examples are given to illustrate our findings

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

a penny for your quotes patent citations and the value of innovations the use ofpatents in economic research has been seriously hindered by the fact that patents vary enormously in their importance or value and hence simple patent counts cannot be informative about innovative output the purpose of this article is to put forward patent counts weighted by citations as indicators of the value of innovations thereby overcoming the limitations of simple counts the empirical analysis of a particular innovation computed tomography scanners indeed shows a close association between citation based patent indices and independent measures of the social value of innovations in that field moreover the weighting scheme appears to be nonlinear increasing in the number of citations implying that the informational content of citations rises at the margin as in previous studies simple patent counts are found to be highly correlated with contemporaneous rd however here the association is within afield over time rather than cross sectional

economic analysis and the quest for competitive advantage curred in the past decade between applied microeconomists and those who study business strategy business strategists have cast up a series of questions for industrial economists who have responded with numerous applications of economic theory and quantitative research methods this interchange has been fruitful and indeed more fruit remains for the picking i shall argue for centering the collaborative effort on what may be called committed competition rivalrous moves among incumbent producers that involve resource commitments that are irrevocable for nontrivial periods of time most concerns of business strategy are with policy choices that

production and inventory model using net present value using the net present value is the standard methodology in theoretical analysis and the most frequently used method for making financial decisions however net present value is rarely used in production and inventory decisions the main reasons appear to be the complexity of the formulae and the robustness of the eoq model we investigate the general multiproduct multistage production and inventory model using the net present value of its total cost as the objective function a power of two heuristic gives us a near optimal solution to this problem if the base period is fixed or varied the solution based on the best power of two heuristic will be within 6 2 or 2 1 of the optimal this result is surprisingly similar to models using the long term average cost the average cost does not reflect the time value of money does this mean that decisions based on average cost are significantly inferior to those based on net present value the answer is quite surprising if we include discounted production cost in the holding cost it turns out that the decision based on average cost is only 9 6 in terms of the net present value of the total cost worse than the decision based on the net present value however the reorder interval based on the average cost could be much longer than that derived using net present value this result shows that average cost is a good approximation to the net present value when the demands are deterministic

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

holding costs under push or pull conditions the impact of the anchor point holding costs are traditionally determined from the investment in physical stock during a cycle an alternative approach instead derives holding costs from net present value npv functions it is known that applying both frameworks to the same system can lead to different holding cost valuations but little explanation has been offered by introducing the anchor point in a model this paper shows for four different systems that traditional holding cost models implicitly assume pull conditions while current npv approaches model push conditions this explains in part the differences between the methods it is shown that the anchor point concept allows the construction of npv models under pull conditions giving results in better correspondence with traditional models the traditional framework is restricted to pull conditions and important considerations could be easily overlooked leading to wrong valuations of holding costs npv seems superior as such considerations are automatically incorporated the application to multi echelon inventory systems provides interesting insights on the roles of echelon stocks and lead times and offers potential for future research

technological pre adaptation speciation and emergence of new technologies how corning invented and developed fiber optics this article investigates how established firms innovate and even initiate new technological trajectories we build on and expand the notion of technological speciation to describe how a new technology emerges when a firm leverages its technological knowledge into a new application domain current research on technological speciation does not investigate how firms accumulate the technological knowledge which they eventually redeploy into different domains nor does it clarify the precise role of luck historical accidents and foresight strategy in shaping the overall process this requires a finer grained investigation of the microprocesses and evolutionary forces underlying the dynamics of technological speciation to this end we use a longitudinal case study of corning s invention and development of fiber optics technology we focus less on testing theory and more on describing a phenomenon to generate new theoretical insight

on the cost of capital in inventory models with deterministic demand abstract in the operations management literature the financial risk in an inventory model is usually assumed to be captured by the constant weighted average cost of capital wacc of the firm this assumption is at best an approximation since this cost depends on the risk of the cash flows which in turn depends on the inventory policy we investigate what the right cost of capital should be in an inventory model with deterministic demand to do so we study an inventory model with a generic inventory cost function where risk depends on the inventory decision made additive and multiplicative financial noise functions are included to assess the impact of these on both the cost of capital of the firm and the optimal inventory policy we find that in contrast to previous models risk is not in general a monotone function of inventory also a rate close to the risk free rate which typically deviates significantly from the wacc should be used to value inventory related investments when the inventory cost function is dominated by holding cost for large order quantities even if investments are subject to other sources of financial variability

contracting for tacit knowledge the provision of technical services in technology licensing contracts abstract recent research on the economic payoff from new technology has emphasized the importance of tacit knowledge or know how this paper shows that arm s length contract can overcome the problems in contracting for know how by bundling complementary inputs with know how in a technology package and leveraging the superior enforceability of contracts over the latter in the empirical part of this paper the relationship between bundling and transfer of know how is analyzed using indian data the results imply that tied sales of inputs may increase the efficiency of contracts involving the transfer of know how a striking result in the context of the current north south debates on intellectual property rights is the packaging of patents with know how

demographic change and the uk savings rate microeconomic data are used to explore the effects of a changing age structure on the uk s aggregate personal savings rate the findings suggest that changes to the population s age structure have had detectable sustained but relative to the yearly changes observed in the savings rate over the previous century modest effects on aggregate personal sector savings it is estimated that the projected changes to the uk s age structure over the next 40 years are likely to raise the uk s savings rate but by no more than two percentage points no basis is found for the view that the aggregate savings rate will decline as a result of the anticipated ageing of the uk population

the eqq model with stochastic demand and discounting abstract we generalize bather s eqq model with stochastic demand to the case with discounting we consider two cases one with and one without demand backlogging important implications of discounting are investigated useful insights and formulas are provided

is there a retirement savings puzzle in this paper we ask whether households are saving enough for their retirement we use data on income expenditure and expenditure components to analyse patterns of behaviour at and around the time of retirement for successive date of birth cohorts we compare periods of unemployment to periods of retirement and separate expenditures into categories reflecting work related expenditures basic necessities and other goods we find that income typically falls by more at unemployment than retirement but the reverse is true for expenditure we observe falls in expenditure at retirement for all expenditure categories using a stochastic life cycle model including mortality rates we assess the anticipated impact of retirement on consumption against that of unemployment the inter relationship between goods and leisure explains a large part of the persistent fall in expenditure at retirement we argue that the only way in which the life cycle hypothesis could be reconciled with the remaining unanticipated dip in consumption would be with the systematic arrival of unexpected adverse information at the time of retirement