bullwhip and batching an exploration the rounding of orders to achieve a batch size is recognised as a source of the bullwhip problem within supply chains while it is often advocated that batch sizes should be reduced as much as possible there has been limited investigation into the impact of batching on bullwhip here we consider scenarios where orders are placed only in multiples of a fixed batch size for both deterministic and stochastic demand rates we derive a closed form expression for bullwhip when demand is deterministic this is validated through a simple model of a production control system an expression for bullwhip in a pass on orders scenario with stochastic demand is also derived and validated using simulation we show the impact of changing batch size on bullwhip in a production control system our results show that a manager may achieve economies through batching while minimising the impact on bullwhip through the careful selection of the batch size

technological discontinuities and the challenge for incumbent firms destruction disruption or creative accumulation the creative destruction of existing industries as a consequence of discontinuous technological change is a central theme in the literature on industrial innovation and technological development established competence based and market based explanations of this phenomenon argue that incumbents are seriously challenged only by competence destroying or disruptive innovations which make their existing knowledge base or business models obsolete and leave them vulnerable to attacks from new entrants this paper challenges these arguments with detailed empirical analyses of the automotive and gas turbine industries we demonstrate that these explanations overestimate the ability of new entrants to destroy and disrupt established industries and underestimate the capacity of incumbents to perceive the potential of new technologies and integrate them with existing capabilities moreover we show how intense competition in the wake of technological discontinuities driven entirely by incumbents may instead result in late industry shakeouts we develop and extend the notion of creative accumulation as a way of conceptualizing the innovating capacity of the incumbents that appear to master such turbulence specifically we argue that creative accumulation requires firms to handle a triple challenge of simultaneously a fine tuning and evolving existing technologies at a rapid pace b acquiring and developing new technologies and resources and c integrating novel and existing knowledge into superior products and solutions

technology uncertainty sunk costs and industry shakeout i propose a novel explanation for new industry shakeouts because of capacity sunk costs and the fear of backing the wrong technology firms initially invest up to a small capacity leading to a large number of initial entrants as the dust settles and a dominant technology emerges surviving firms expand to their long term optimal capacity which results in a reduction in the number of competitors notwithstanding the increase in total market output copyright 2012 the author 2011 published by oxford university press on behalf of associazione icc all rights reserved oxford university press

the enactment of socio technical transition pathways a reformulated typology and a comparative multi level analysis of the german and uk low carbon electricity transitions 1990 2014 abstract this paper aims to make two contributions to the sustainability transitions literature in particular the geels and schot 2007 res policy 36 3 399 transition pathways typology first it reformulates and differentiates the typology through the lens of endogenous enactment identifying the main patterns for actors formal institutions and technologies second it suggests that transitions may shift between pathways depending on struggles over technology deployment and institutions both contributions are demonstrated with a comparative analysis of unfolding low carbon electricity transitions in germany and the uk between 1990 2014 the analysis shows that germany is on a substitution pathway enacted by new entrants deploying small scale renewable electricity technologies rets while the uk is on a transformation pathway enacted by incumbent actors deploying large scale rets further analysis shows that the german transition has recently shifted from a stretch and transform substitution pathway to a fit and conform pathway because of a fightback from utilities and altered institutions it also shows that the uk transition moved from moderate to substantial incumbent reorientation as government policies became stronger recent policy changes however substantially downscaled uk renewables support which is likely to shift the transition back to weaker reorientation

the governance of sustainable socio technical transitions a quasi evolutionary model of socio technical transitions is described in which regimes face selection pressures continuously differentiated transition contexts determine the form and direction of regime change in response to these pressures the articulation of pressures and the degree to which responses are coordinated and based on resources available within the regime define the transition context four alternative contexts are described endogenous renewal re orientation of trajectories emergent transformation and purposive transitions agency and power in the governance of regime transformation are analysed power to affect change depends on regime membership the distribution of resources for change and expectations

can rural electric cooperatives survive in a restructured us electric market an empirical analysis this paper examines the ability of rural electric distribution cooperatives to continue operating in their present form in a restructured electricity market more specifically i develop and estimate a quadratic cost model which unlike many of the cost functions employed in studies of this nature conforms to all of the properties of a proper cost function using 1996 data i find that these firms are not operating in a cost minimizing fashion this finding seems to occur because each is too small in terms of the quantity of electricity distributed as a result mergers between these firms could yield substantial savings and help ensure their survival in their present form in a deregulated market

incumbents diversification and cross sectorial energy industry dynamics abstract within the sustainability transitions literature established mature or incumbent firms have been stereotyped as locked in to socio technical regimes however we believe regimes have been black boxed and few studies have explored incumbents responses to transition processes this article aims to achieve an improved understanding of incumbents in established energy sectors and their extent of involvement in other niche energy sectors to this avail we analyze data from a first of its kind survey of 133 incumbent firms in norway s two main energy sectors namely oil gas and hydropower providing inter temporal dimensions our data covers incumbents diversification activities beyond their primary sector both in the past cancelled activities present ongoing activity in secondary sectors and future ambitions of diversification and also distinguishes between producers and product service suppliers by incorporating insights on firm diversification our analysis sheds new light on the complex transformation processes associated with sustainability transitions empirical results show considerable heterogeneity in incumbents responses to changing selection pressures which can be explained by recognition that windows of opportunity are opening and some incumbents see potential to leverage their resources and capabilities to capture value in new niche energy sectors in both domestic and international markets

understanding carbon lock in abstract this paper narrative argues that industrial economies have been locked into fossil fuel based energy systems through a process of technological and institutional co evolution driven by path dependent increasing returns to scale it is asserted that this condition termed carbon lock in creates persistent market and policy failures that can inhibit the diffusion of carbon saving technologies despite their apparent environmental and economic advantages the notion of a techno institutional complex is introduced to capture the idea that lock in occurs through combined interactions among technological systems and governing institutions while carbon lock in provides a conceptual basis for understanding macro level barriers to the diffusion of carbon saving technologies it also generates questions for standard economic modeling approaches that abstract away technological and institutional evolution in their elaboration the question of escaping carbon lock in is left for a future paper

implementing renewable energy portfolio standards the good the bad and the ugly in a two state comparison abstract understanding how household practices with regard to energy usage change and how to most effectively encourage the adoption of technologies that utilize renewable energy sources at the residential scale are important issues for addressing the environmental impacts of energy use here the social practices model spaargaren 2003 is applied to examine solar technology adopters in two u s states who were interviewed about adopting residential solar electric technology and specifically about their experiences with the rebate and incentive programs available to them examining the policies and interrogating their potentially unintended consequences from the perspective of the user sheds light on how residential solar incentive programs act as systems of provision shaping the practices of solar technology adopters in hopes of improving these incentive programs and effectively encouraging increased residential solar technology adoption findings suggest that feed in tariffs offer additional positive outcomes related to broadening the context for adoption and encouraging future energy conservation while size restrictions wholesale pricing in net metering agreements and inconsistent policy mechanisms across utilities in the same state all have potentially unintended negative consequences utilizing a perspective attentive to social practice offers a means of improving the design and implementation of energy policy

disruption disintegration and the dissipation of differentiability this paper proposes a deductively derived model to help managers who preside over decisions to integrate or outsource to assess ex ante whether when and why it might be strategically and competitively important to develop internal capabilities to perform certain activities in house and when it would be sensible and safe to outsource elements of value added among the paper s conclusions are that the competitive advantage from vertical integration is strongest in tiers of the market where customers are under served by the functionality or performance available from products in the market vertical integration tends to be a disadvantage when customers are over served by the functionality available from products in the market vertically integrated firms will therefore often dominate in the most demanding tiers of markets that have grown to substantial size while a horizontally stratified or disintegrated industry structure will often be the dominant business model in the tiers of the market that are less demanding of functionality

internationalising in small incremental or larger steps we argue that companies may enter foreign environments either incrementally as suggested by long established theory or by taking larger steps that may result in lower initial performance but through learning and experience lead to increased performance in future expansions this idea is corroborated by the experience of dutch companies entering into central and eastern europe we also find that expansion steps may be too large thereby limiting the exploration of foreign environments our study suggests that sequential internationalisation strategies do still matter and that companies have to balance exploitation and exploration in internationalisation

information distortion in a supply chain the bullwhip effect this article originally appeared in management science april 1997 volume 43 number 4 pp 546 558 published by the institute of management sciences consider a series of companies in a supply chain each of whom orders from its immediate upstream member in this setting inbound orders from a downstream member serve as a valuable informational input to upstream production and inventory decisions this paper claims that the information transferred in the form of orders tends to be distorted and can misguide upstream members in their inventory and production decisions in particular the variance of orders may be larger than that of sales and distortion tends to increase as one moves upstream a phenomenon termed bullwhip effect this paper analyzes four sources of the bullwhip effect demand signal processing rationing game order batching and price variations actions that can be taken to mitigate the detrimental impact of this distortion are also discussed

creative destruction or mere niche support innovation policy mixes for sustainability transitions recently there has been an increasing interest in policy mixes in innovation studies while it has long been acknowledged that the stimulation of innovation and technological change involves different types of policy instruments how such instruments form policy mixes has only recently become of interest we argue that an area in which policy mixes are particularly important is the field of sustainability transitions transitions imply not only the development of disruptive innovations but also of policies aiming for wider change in socio technical systems we propose that ideally policy mixes for transitions include elements of creative destruction involving both policies aiming for the creation of new and for destabilising the old we develop a novel analytical framework including the two policy mix dimensions creation and destruction by broadening the technological innovation system functions approach and specifically by expanding the concept of motors of innovation to motors of creative destruction we test this framework by analysing low energy policy mixes in finland and the uk we find that both countries have diverse policy mixes to support energy efficiency and reduce energy demand with instruments to cover all functions on the creation side despite the demonstrated need for such policies unsurprisingly destabilising functions are addressed by fewer policies but there are empirical examples of such policies in both countries the concept of motors of creative destruction is introduced to expand innovation and technology policy debates to go beyond policy mixes consisting of technology push and demand pull instruments and to consider a wider range of policy instruments combined in a suitable mix which may contribute to sustainability transitions

the variability of aggregate demand with s s inventory policies this paper develops a general theory of the aggregate implications of s s inventory policies it is shown that s s policies add to the variability of demand with the variance of orders exceeding the variance of sales overall the s s theory contradicts the widely held notion that retail inventories act as a buffer protecting manufacturers from fluctuating sales in 1951 arrow harris and marschak 3 introduced the s s form of inventory policy the policies are designed for retailers of finished goods who face economies of scale when placing orders with their suppliers to pursue an s s inventory policy the retailer establishes a lower stock point s and an upper stock point s no order is placed until inventories fall to s or below whereupon they are restored to the maximum of s a general proof of the optimality of these s s inventory policies was provided by scarf 13 at the microeconomic level the model has been extensively investigated formulae are available to compute optimal policies e g ehrhardt 6 and these policies are xidely used in industry e g schwartz ed 14 in addition the model has been extended to increasingly complex demand environments e g karlin and fabens 11 in contrast little is known about the macroeconomic implications of s s policies several recent papers have begun to correct this deficiency akerlof has suggested that pursuit of constant threshold money holding policies of the s s variety might be responsible for the observed low short run income elasticity of the demand for money akerlof 1 and akerlof and milbourne 2 in the operations research literature ehrhardt schultz and wagner 7 analyzed the demand environment of a wholesaler supplying several retailers they required that the distinct retailers have independent sales ruling out the analysis of common factors in sales finally simulation results of blinder 4 suggested a role for the s s model in understanding retail sector inventories however the theoretical difficulties with the model remained unresolved blinder commented if firms have a technology that makes the s s rule optimal aggregation across firms is inherently difficult indeed it is precisely this difficulty which has prevented the s s model from being used in empirical work to date blinder 4 p 459 in this paper we present a general theory of the aggregate implications of s s policies our central finding is that s s policies add to the variability of demand with the variance of orders exceeding the variance of sales this result holds even in the presence of common factors in retail sales in addition a close connection

properties of lot sizing rules under lumpy demand when a lot sizing problem is viewed from a context of buyer supplier relationships an important phenomenon frequently encountered by the supplier is a so called lumpy demand however there has been very little attention devoted to study the behaviour and performances of lot sizing rules under the situation of lumpy demand this paper presents both analytical and experimental studies of lot sizing rules for lumpy demand situations the analytical study is based on the assumption that constant demand occurs for every fixed number of periods in the experimental study both the quantity of and the time between demands are allowed to vary the studies show that analytical results provide good insights in understanding the behaviour and performances of lot sizing rules when more realistic situations are addressed in the experimental study the paper also confirms that the results of lot sizing studies under the situation of non lumpy demand cannot be entirely generalised to the situation with lumpy demand r 2002 elsevier science b v all rights reserved

transition pathways revisited established firms as multi level actors in the heavy vehicle industry abstract the multi level perspective on sustainability transitions positions established firms incumbents as defenders of existing technologies at the regime level by contrast it positions new entrants at the niche level as promoters of new technologies this paper challenges the positioning of firms as actors on either regime or niche levels based on a comparative analysis of technology strategies in the heavy vehicle industry the paper shows that established firms are active at both levels developing several technology alternatives simultaneously this means that incumbents technology strategies determine important parts of the required niche regime interactions the paper also shows how incumbents may pursue contrasting technology strategies while some adopt a dualistic approach keeping regime and niche level activities technologically and commercially separate others develop integrated strategies where niche activities are leveraged to impact upon the regime level the cases studied illustrate how the success of such integrated strategies depends on the emergence of bridging policies bridging policies are relevant both for linking early niche markets to broader regime level markets and for supporting further technological advancements of niche markets

internationalization as a strategy to overcome industry barriers an assessment of the marine energy industry abstract research on conditions to develop new innovations within emerging renewable energy industries is often done with a national focus however recent research on international entrepreneurship has revealed that firms operate on international levels very early in their life time thus based on former research on international entrepreneurship and case examples we build the propositions that firms in the marine energy industry use internationalization as a strategy to overcome industry barriers our primary source of data is a unique dataset from a global survey of all the companies in the marine energy industry who are aiming to commercialize a wave or tidal energy device this paper is organized in two steps first we identified the most challenging industry barriers perceived by companies second we use these to form propositions which we assess through empirical data the two most challenging barriers perceived by the companies are need for capital and need for supportive political schemes our findings reveal that internationalization certainly is a common strategy to access capital and attractive support schemes in foreign countries the early internationalization has implications for researchers managers and policy makers

smart grids and the transformation of the electricity sector ict firms as potential catalysts for sectoral change abstract the sustainability challenges associated with increasing demand and generation of electricity require a far reaching transformation of the energy system smart grid technologies are expected to play a major role in such sectoral transformation while a growing body of literature is concerned with the dynamics and particularities of sectoral transformation most contributions have focused on exogenous shocks or new technological developments as drivers of change this paper complements the existing perspectives by exploring the role of actors as catalysts for transformation within the field of smart grid we study the transformative influence of ict firms on the energy sector in europe more specifically we analyze actor participation in 450 european smart grid projects between 2000 and 2011 as well as acquisitions in the field we find that incumbent firms from the ict sector have gained influence and drive transformation through the creation of variety in terms of technology business models and value chains as a strategic reaction electricity sector incumbents have recently acquired many start ups specialized in ict technology and thus expanded their competence base we conclude that entrants from another sector can be important catalysts for sectoral transformation and should be analyzed more systematically in transition studies

the destabilisation of existing regimes confronting a multi dimensional framework with a case study of the british coal industry 1913 1967 because innovation studies are oriented towards novelty scholars in this field have paid less attention to the destabilisation of existing regimes this paper discusses four views on industry destabilisation and presents an encompassing conceptual framework which addresses interactions between the build up of external pressures industry response strategies and the gradual weakening of commitment to existing regime elements we confront the framework with an in depth longitudinal case study of the british coal industry 1913 1967 specific conclusions are developed about different degrees of regime inertia the ebb and flow of external pressures the relative importance of economic and socio political pressures and interactions between them

inventory performance under pack size constraints and spatially correlated demand abstract motivated by a problem facing a large retailer we consider the impact of pack size on the performance of a periodic review inventory system in the presence of spatial i e between retailers correlation of demand which we model using an equicorrelated multivariate poisson distribution employing simulation we utilise a full factorial experiment to provide support for decisions on product and supplier selection and whether or not packs should be split during distribution we consider variables such as pack size correlation and the number of branches and discuss how they and their interactions impact performance metrics such as inventory and shortage levels and the bullwhip effect

technological innovations and sectoral change transformative capacity adaptability patterns of change an analytical framework following up on recent debates about sectoral systems of innovation and production the paper introduces a heuristic framework for analyzing and explaining distinct patterns of technology based sectoral change the concept is based on two interrelated influencing factors the first is the sectoralspecific transformative capacity of new technologies themselves that is their substantial or incremental impact on socioeconomic and institutional change in a given sectoral system the second is the sectoral adaptability of socioeconomic structures institutions and actors confronted with the opportunities presented by new technologies the first factor the sectoral transformative capacity of new technologies enables us to identify the technology based pressure to change and adjust the structural institutional and organizational architectures of the sectoral system the second complementary factor sectoral adaptability helps us to discern the distinct social patterns of anticipating and adopting this technology based pressure the specific interplay between the two influencing factors creates distinguishable modes of sectoral transformation ranging from anticipative and smooth adjustments to reactive and crisis ridden patterns of change even processes of radical sectoral change continue over longer periods of mismatch and are characterized by numerous and mostly gradual organizational structural and institutional transformations

strategic niche management from a business perspective taking cleaner vehicle technologies from prototype to series production strategic niche management has been outlined as a policy approach to assist development and diffusion of cleaner new technologies based on a case study describing the efforts of a leading actor in the heavy vehicle industry to develop and commercially introduce hybrid electric vehicles this paper discusses strategic niche management from the perspective of the manufacturing firm in particular the paper analyses experiences from extensive field tests executed in london tests which involved a number of different manufacturers hybrid systems and vehicles the scale of this technological niche added confidence and credibility to the technology and helped opening up an important niche market which was supported by an extensive subsidy scheme the analysis shows how the field tests and the subsidies jointly functioned as bridging policies that facilitated an important step in the market formation process the analysis further points at a critical tension between niches and the volume oriented business of a major vehicle manufacturer showing how investments in new technology need to be warranted in market trends and projections of future sales and production volumes to become accepted within a vehicle manufacturer s organization

managing supply chain demand variability with scheduled ordering policies this paper studies supply chain demand variability in a model with one supplier and n retailers that face stochastic demand retailers implement scheduled ordering policies orders occur at fixed intervals and are equal to some multiple of a fixed batch size a method is presented that exactly evaluates costs previous research demonstrates that the supplier s demand variance declines as the retailers order intervals are balanced i e the same number of retailers order each period this research shows that the supplier s demand variance will generally decline as the retailers order interval is lengthened or as their batch size is increased lower supplier demand variance can certainly lead to lower inventory at the supplier this paper finds that reducing supplier demand variance with scheduled ordering policies can also lower total supply chain costs

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

patterns of innovation and organizational demography in emerging sustainable fields an analysis of the chemical sector this paper examines the patterns of environmental innovation in the chemical sector and focuses in particular on detecting whether the rise of sustainable chemistry technologies sct has stimulated the emergence of new organizations this question is important to assess the extent to which sct are sustaining the technological advantage of industry incumbents or are creating opportunities for new firms aspiring to develop radically new environmental innovations we found that sct still represent a relatively low proportion of chemical technologies and that they have not stimulated in a significant way the emergence of new firms however the importance of new firms has grown in the last 20 years and their technologies seem to have a higher potential of radicalness than incumbents technologies this indicates that although incumbents advantage remains strong a small group of young firms has started to weaken such advantage moreover the important role played by research organizations in generating sct may signal that technological opportunities are expanding and that some governments in particular the us government are committed to develop sct these results suggest that if supported by effective policies technological ferment in the field which at the present appears still limited has a potential of growth

on bullwhip in supply chains historical review present practice and expected future impact abstract demand amplification or bullwhip as it is now called is not a new phenomenon since evidence of its existence has been recorded at least as far back as the start of the 20th century and is well known to economists yet industry worldwide still has to cope with bullwhip measured not just in terms of the 2 1 amplification which is frequently quoted but sometimes it is as high as 20 1 from end to end in the supply chain this can be very costly in terms of capacity on costs and stock out costs on the upswing and stockholding and obsolescence costs on the downswing in this paper we have identified 10 published causes of bullwhip all of which are capable of elimination by re engineering the supply chain we offer evidence on the present health of a family of supply chains and pinpoint much good practice this is in anticipation that such excellence will become normative in the near future as the learning experience gathers momentum and provided that human factors are properly addressed

the rural utility response to colorado s electricity mandates abstract when colorado voters passed amendment 37 in 2004 it became the first state to pass a renewable portfolio standard at the ballet box suggesting broad appeal to harness and pay for renewable energy while large urban utilities are prepared to make this transition smaller cities and rural areas for various financial and scale issues are severely disadvantaged in trying to incorporate more renewable energy sources into their electricity mix this was evident by the state s support for amendment 37 which was passed due to strong support in the denver metro area representing nearly half of the state s population support for the bill was poor in the rest of the state nevertheless in 2007 the state expanded up amendment 37 by forcing the utilities in rural communities to diversify their electricity mix this study surveyed the managers at the state s various rural electric cooperatives and municipal utilities in an effort to gage their attitudes concerning carbon legislation conservation and efficiency programs and their plans for making the transition away from fossil fuel generation

sprayed to death path dependence lock in and pest control strategies theoretical literature on the economics of technology has emphasized the effects on technological trajectories of positive feedbacks in a competition among technologies that all perform a similar function the presence of increasing returns to adoptions can force all but one technology from the market furthermore the victor need not be the superior technology this paper provides an empirical study of one technological competition which illuminates this theoretical work it uses theoretical results to explain why chemical control of agricultural pests remains the dominant technology in spite of many claims that it is inferior to its main competitor integrated pest management copyright 1996 by royal economic society

optimal centralized ordering policies in multi echelon inventory systems with correlated demands this paper treats a depot warehouse system in which demand occurs at the warehouse or retail level this work differs from a number of other studies in that we allow item demands to be correlated both across warehouses and also correlated in time our motivation for this generalization arises from our experience with an actual system of this type used by a major national producer and distributor of consumer products we observed both high correlations between successive monthly demands around 0 7 and correlations between demands for an item at different locations also about 0 7 in a given time period we derive an explicit expression for the optimal safety stock as a function of the level of correlation through time the analysis requires two assumptions 1 the allocation assumption and 2 the equal coefficient of variation assumption similar assumptions have been used by other researchers finally numerical evaluations are included to illustrate the impact of the various magnitudes of correlation

socio technical inertia understanding the barriers to electric vehicles it is widely accepted that electrification of the transport sector is one of several technological trajectories that could redress some of the environmental issues associated with the growth in travel demand including climate change and oil demand at a global scale and air quality and noise pollution at the urban scale electric vehicles have been considered a promising technology at repeated intervals over the last century but this promise has not been realised this paper is a contribution to understanding the key tools and strategies that might enable the successful introduction of new technologies and innovations by exploring the key barriers to electric vehicles encountered in two countries uk and germany where the automobile industry has been historically significant the study evaluates stakeholders opinions on relevant regulation infrastructure investment r d incentives and consumer incentives the key findings of the research are that the introduction and penetration of evs is confronted by several barriers that inhibit a larger market penetration under current conditions which in turn casts doubt on the assumptions of strategic niche management and transitions theory