investment in cleaner technology and signaling distortions in a market with green consumers abstract i analyze the pricing and investment behavior of a firm that signals the environmental attributes of its production technology through its price to uninformed environmentally conscious consumers i then analyze the effect of change in environmental regulation on the signaling outcome and the firm s ex ante incentive to invest in cleaner technology when regulation is weak a firm signals cleaner technology through higher price in this case the firm earns lower profit when it has cleaner technology and thus has no incentive to invest in cleaner technology the price charged by the clean firm declines sharply beyond a critical level of regulation when regulation is sufficiently stringent the firm with cleaner technology charges lower price but earns higher signaling profit and ex ante the firm has positive incentive to invest in cleaner technology with weak regulation the incentive of the firm to directly disclose its environmental performance rather than signal it through price is increasing in the level of regulation the opposite holds when regulation is sufficiently stringent

a two echelon sustainable supply chain coordination under cap and trade regulation this paper analyses the decision behaviour and coordination mechanisms for a two echelon sustainable supply chain under a cap and trade regulation in a make to order setting carbon emissions are generated primarily by the downstream manufacturing process and the market demand of the supply chain is affected by two decision variables the sustainability level and the selling price the impact of the unit emissions trading price on the optimal decision variables in both centralized and decentralized systems is revealed the comparison of decentralized and centralized systems shows that the increase in total profit in centralized system is at most 1 3 that in decentralized system to achieve the same profit as the centralized system we consider two contracts to coordinate the sustainable supply chain revenue sharing and two part tariff contracts by analysing the conditions for a win win outcome we prove that only the two part tariff contract can lead to perfect coordination finally sensitivity analysis of the key parameters is undertaken as part of a numerical example illustrating the theoretical results

on inventory control of product recovery systems subject to environmental mechanisms abstract the aim of this paper is to study the impact of inventory control in reducing the carbon footprint of an organization through a stochastic inventory model our research extends the traditional minimization cost problem by incorporating environmental legislation we consider a finite horizon closed loop system whereby decisions are subject to an emissions trading scheme and to random demand and returns demand can be satisfied by two sources the primary source is environmentally friendly but expensive whereas the second is cost effective but with negative environmental consequences the problem is formulated as a stochastic dynamic problem where replenishment and carbon management decisions must be made at each period the objective is to describe how replenishment and carbon management strategies are affected by environmental constraints in particular considering the computation restriction of dynamic programming in order to extend the results we propose a genetic algorithm to find near optimal solutions for larger instances a sensitivity analysis is performed to identify the impact of carbon allowance prices emission cap and other environmental factors in the decision making process the results indicate that environmental strategies and their factors have an impact on replenishment decisions there is an emission cap from which a company must focus on strategic decisions rather than on tactical and operational decisions in addition if the carbon allowance price is such that the environmental benefit absorbs the cost of less polluting technology a change in the inventory policy must be made

optimization of manufacturing systems under environmental considerations for a greenness dependent demand abstract in this work we show that the optimization models for manufacturing systems should evolve to consider the environmental impacts of manufacturing activities and to integrate the environmental performance of finished products in particular the selection of manufacturing processes technologies and input items components should be revised with environmental consideration with this scope in mind we develop two optimization models where we consider the selection of production processes and the choice of input products in the first model a single product is offered by the firm and the demand of this product depends on its greenness in the second model the market is segmented between ordinary and green customers and the firm offers a different variety of the output product to each segment in this case both the demand and the price depend on the product greenness in both models the greenness of the output product is a decision variable that is simultaneously determined along with the other decisions in addition the models integrate environmental legislations we conduct numerical experiments on a case study from the textile sector in order to show how the integration of the product greenness impacts on the system profit and decisions

optimal production and carbon emission reduction level under cap and trade and low carbon subsidy policies abstract in recent years massive carbon emissions have caused serious global environmental damage such as a worsening greenhouse effect and thick haze to curb carbon emissions as well as maintain sustainable economic development governments promote the development of low carbon economy by issuing multiple policies among which the cap and trade policy ctp and low carbon subsidy policy lcsp are widely adopted moreover manufacturers are increasingly adopting carbon emission reduction technology to produce greener products considering related government policies and rising environmental awareness among consumers to give policy making insights to governments as well as production and carbon emission reduction decision making insights to manufacturers this paper investigates the impacts of ctp and lcsp on the production and carbon emission reduction level of a manufacturer and explores which policy is better for society the results show that the carbon emission reduction level increases as the carbon trading price increases whereas it is independent of the unit low carbon subsidy interestingly the carbon trading price does not always have a negative effect on the manufacturer s profit and the cap does not always produce a positive effect on the manufacturer s profit more importantly we find that lcsp is more beneficial to society when the environmental damage coefficient is less than a threshold but otherwise ctp is more beneficial

research advances in environmentally and socially sustainable operations abstract consumers and governments are pressuring firms to strike a balance between profitability and sustainability however this balance can only be maintained in the long run if the firm can take a holistic approach to sustain the financial flow profit resource flow planet and development flow people for the entire ecosystem comprising poor producers in emerging developing markets global supply chain partners consumers in developed countries and the planet by considering the flows associated with different entities within the ecosystem we classify and summarize recent operations research management science or ms research developments also we identify several gaps for future research in this important area

design for the environment a quality based model for green product development green product development which addresses environmental issues through product design and innovation as opposed to the traditional end of pipe control approach is receiving significant attention from customers industries and governments around the world in this paper we develop a quality based model for analyzing the strategic and policy issues concerning the development of products with conflicting traditional and environmental attributes on the demand side of the problem we use the framework of conjoint analysis to structure the preferences of the ordinary and green customers on the supply side we apply the theories in optimal product design and market segmentation to analyze the producer s strategic decisions regarding the number of products introduced and their prices and qualities on the policy side we evaluate the effects of environmental standards on the economic and environmental consequences of green product development by jointly considering the interactions among the customers preferences the producer s product strategies and the environmental standards imposed by governments we present some interesting findings that can be used to manage and regulate the development of green products two major findings show that green product development and stricter environmental standards might not necessarily benefit the environment

preference disaggregation 20 years of mcda experience abstract the philosophy of preference disaggregation in multicriteria decision aid systems mcda is to assess infer global preference models from the given preferential structures and to address decision aiding activities this paper presents a panorama of preference disaggregation methods and summarises the most important results and applications over the last 20 years

environmental resource planning under cap and trade models for optimization abstract under the conditions of a cap and trade c t program manufacturers are restricted in total greenhouse gas emissions but allowed with options to acquire and dispose environmental resource e g certified emission quota ceq or commercialized permit for emission of certain pollutant via a market system or conduct self purification sp to reduce emission level to satisfy their overall emission needs due to production or service activities this paper analyzes the operational decisions of production systems under cap and trade conditions in which the problem is modeled as a multi stage dynamic optimization problem for each planning period the model specifically addresses the decisions on purchasing ceq reducing emission via sp and carrying over surplus emission quota seq to meet the required emission level driven by production demand for the period it also makes sure that the sum of reduced emission over the whole planning horizon meets exactly a goal of emission reduction specified at the manufacturers discretion other important problem characteristics addressed include the unit cost for reducing emission level via sp to reflect the fact that the cost increases as accumulated emission reduction increases i e the more reduced the more difficult to reduce and time related cost associated with green investment for emission reduction e g interest cost of short term loans these characteristics make the model and related analysis useful for both practitioners and researchers in this area numerical experiments were designed and carried out to verify and validate the proposed concepts

toward a theoretical model of voluntary overcompliance abstract we explain why some firms voluntarily overcomply with environmental regulation in our model all consumers value environmental quality but differ in their willingness to pay which depends on their income levels publicly available information on environmental performance of firms enables consumers to identify clean firms firms participate in a two stage duopoly game where they first choose their levels of cleaning technology and next engage in price competition the market gets segmented by income levels a minimum standard binding on the dirty firm has the effect of improving the performance of the cleaner firm a subsidy obtains the same competitive outcome

comparisons of initial carbon allowance allocation rules in an o2o retail supply chain with the cap and trade regulation abstract this paper focuses on an o2o retail supply chain in the context of low carbon environment the decision models are constructed under three cases without cap and trade regulation cap and trade regulation based on grandfathering mechanism and cap and trade regulation based on benchmarking mechanism the emission reduction strategies of the supply chain members in the three cases are then discussed the paper compares the effects of the grandfathering and benchmarking mechanisms on the firm s decisions profits and social welfare firstly the results show that the unit carbon quota plays a decisive role in firm s decisions compared with the grandfathering methodology the benchmarking one can more effectively push manufacturers to produce low carbon products and motivate retailers to promote low carbon products secondly it is profitable for the retailer to cooperate with a manufacturer who has lower emission reduction cost simultaneously the retailer will prefer the benchmarking mechanism to the grandfathering mechanism thirdly for the government it is beneficial to use grandfathering mechanism for low carbon emission firms and use benchmarking mechanism for high carbon emission firms also the paper provides government and firms with conditions where the benchmarking allocation method is more suitable for sustainable development the government s decision on benchmarks is a critical factor in maximizing the social welfare

addressing climate change with a comprehensive us cap and trade system there is growing impetus for a domestic us climate policy that can provide meaningful reductions in emissions of carbon dioxide co2 and other greenhouse gases i describe and analyse an up stream economy wide co2 cap and trade system which implements a gradual trajectory of emissions reductions with inclusion over time of non co2 greenhouse gases and includes mechanisms to reduce cost uncertainty initially half of the allowances are allocated through auction and half through free distribution with the share being auctioned gradually increasing to 100 per cent over 25 years the system provides for linkage with emission reduction credit projects in other countries harmonization over time with effective cap and trade systems in other countries and regions and appropriate linkage with actions taken in other countries in order to establish a level playing field among domestically produced and imported products

impact of efficiency investment and competition on low carbon manufacturing abstract low carbon economy has become a top agenda for many countries following the agreement in the paris meeting on climate change in this article we take price and emission sensitive demand into account and incorporate competition between the two rival manufacturers in the demand function this research takes more proactive actions incorporating carbon emissions in the strategic and operational decisions which complements the existing literature on low carbon manufacturing in which the carbon emissions attribute is often used as a constraint or only the single manufacturer s demand is considered based on game theory the pricing and carbon emissions reduction decisions are investigated our study contributes to the existing literature on low carbon manufacturing by specifically examining the impact of production efficiency carbon emissions reduction efficiency and market power structure on achieving low carbon manufacturing through the systematic analysis of optimal pricing and green technology investment decisions to improve the economic and environmental performance under different market power structures our findings provide valuable managerial implications which will help many manufacturing firms to make important strategic and operational decisions regarding low carbon manufacturing

sustainable allocation of greenhouse gas emission permits for firms with leontief technologies abstract in this paper we deal with production situations where a cap or limit to the amount of greenhouse gas emissions permitted is imposed fixing a tax for each ton of pollutant emitted is also considered we use bankruptcy rules to define cooperative games with externalities associated with these situations and analyze the existence of coalitionally stable allocations of the emission permits we prove that the constrained equal awards cea rule provides stable allocations and as a direct mechanism it is incentive compatible these two facts have interesting managerial implications to control pollution emissions

marketplaces markets and market design marketplaces are often small parts of large markets and both markets and marketplaces come in many varieties market design seeks to understand what marketplaces must accomplish to enable different kinds of markets marketplaces can have varying degrees of success and there can be marketplace failures i ll discuss labor markets like the market for new economists and also markets for new lawyers and doctors that have suffered from the unraveling of appointment dates to well before employment begins markets work best if they enjoy social support but some markets are repugnant in the sense that some people think they should be banned even though others want to participate in them laws banning such markets often contribute to the design of illegal black markets and this raises new issues for market designers i ll briefly discuss markets and black markets for narcotics marijuana sex and surrogacy and the design of markets for kidney transplants in the face of widespread laws against and broader repugnance for compensating organ donors i conclude with open questions and engineering challenges

customer regulatory and competitive pressure as drivers of environmental innovation we develop an economic analysis in order to examine the effects of consumer regulatory and competitive pressure on firm investments in environmentally friendly production specifically we ask why do firms vary in their levels of environmental innovation under what conditions are such pressures effective in bringing about environmental innovation we first consider a monopolist who faces the twin pressures of reduced customer demand and regulatory penalties as a result of its emissions in response to these pressures the firm has the opportunity to make a costly investment in reduction of emissions secondly we consider a competitive scenario in which two firms compete for environmentally sensitive customers solving our model we find that pressure has the intended effect as long as the firm s initial level of emissions is below a certain threshold if the emissions are above this threshold we find that pressure might have an adverse effect on the firm s environmental investment and that subsidies that support environmental innovation can be a better alternative we also show that competition over environmentally sensitive customers can improve the effectiveness of environmental pressures

academic economists behaving badly a survey on three areas of unethical behavior thomas l martin this article measures the degree to which academic economists have engaged in unethical behavior and the degree to which academic economists believe the profession as a whole engages in unethical behavior three main types of unethical behavior are examined 1 falsification of research 2 expropriation of graduate student research or including an undeserving co author on a research paper and 3 exchange of grades for gifts money or sex using a unique data set gathered at the 1998 american economic association aea meetings we find that there is a significant amount of misconduct particularly in the second category jel a11 a13 i introduction both the popular and academic press have noted the existence of falsified research in the hard sciences and in medicine u s nuclear weapons tests conducted in the 1950s came under attack in the 1960s for allegedly using false data and defrauding federal courts concerning the health impact on downwind humans and livestock the discovery of the deception of research subjects and the reporting of fabricated experiments led to a new emphasis in the 1960s and 1970s on the ethics of scientific research shrader frechette 1994 federally funded research in particular came under closer scrutiny of the white house and various executive branch agencies lafollette 1994 recently front page stories in major newspapers have reported that robert p liburdy a cell biologist at lawrence berkeley laboratories resigned after investigators with the office of research integrity of the department of health and human services concluded that he falsified key data tying cancer to electrical power lines schevitz 1999 broad 1999 in economics research with no lives in danger it would seem that such behavior would be easier to rationalize an inflated t ratio here an undeserving co author there who really is hurt by such behavior academic economists after all do not have patients 1 nevertheless most scholars would agree that research is intended to further the pursuit of truth fraudulent or unethical research will poison the well of that scientific truth ethical conduct in research is not a matter of etiquette but a question of the moral principles by which any researcher is guided in the past few decades there have been efforts to examine the ethics of research in the areas of hard science medicine engineering and national security see e g hook 19771 bulmer 1982 sieber 19921 2 a few decades ago our own discipline experienced an unfathomable event the quarterly journal of economics was forced to withdraw a published article after learning that its author had simply copied the work of another economist qje 1984 a similar incident recently occurred in the economics journal kyklos forcing the editors to issue a public apology that included a strong statement plagiarism jeopardizes scientific research kyklos 1999 311 these pieces of evidence suggest that unethical research practices occur within economics but very little nonanecdotal evidence exists to measure the extent of such behavior our study is an attempt to measure the degree to which individual academic economists have engaged in unethical behavior and the degree to which academic economists bel ieve the profession as a whole engages in unethical behavior three main types of behavior are examined 1 falsification of research 2 expropriation of graduate student research or including an undeserving co author and 3 exchange of grades for gifts money or sexual favors we examine the self reported unethical behavior of the profession through anonymous responses because of the extremely sensitive nature of the questions we split the sample by using direct response questions for one group and the added protection of a randomized response technique for the other ii the survey method the ethics surveys were hand delivered to approximately 1 000 academic economists about 20 of the participants attending the january 1998 meetings of the american economic association aea in chicago illinois

sustainable economic production quantity models for inventory systems with shortage abstract recently new economic order production quantity models have shifted away from focusing only on economic issues and towards combined economic environmental concerns because of sustainable development goals despite this shift only a few works have addressed sustainable economic production quantity epq the theoretical sustainable eoq and epq models are basic models that ignore many real life conditions such as the possibility of stock out in inventory systems in this paper we develop four new sustainable economic production quantity models that consider different shortage situations to find optimal values of inventory system variables we solve four independent profit maximization problems for four different situations these proposed models include a basic model in which shortages are not allowed and when shortages are allowed the lost sale full backordering and partial backordering models can be selected by operations managers depending on the manufacturer s motivation to improve service levels we have also proposed an algorithm for determining optimum values of the decision variables for these sustainable economic production quantity models finally the formulated models are explained with some different examples and the obtained results have been analyzed and discussed these results show that the sustainable economic production quantity with partial backordering model is a general and more realistic model that can be used in many real cases with a reasonable profit amount compared with the three other proposed models

an optimization model for a monopolistic firm serving an environmentally conscious market use of chemical reaction optimization algorithm this work considers a monopolist firm which faces the following twin challenges of serving an environmentally sensitive market the first challenge is the demand s elasticity to emissions and price to entice its emission conscious customers and generate higher demand the firm incrementally invests in cleaner production technologies it also adopts a voluntary limit on its emissions from transportation however such investments and penalty lead to the second challenge of reduced net profit to address above trade off a non linear programming nlp model with a maximization quadratic profit function has been formulated recently developed chemical reaction optimization algorithm with superior computational performance has been adopted to solve the nlp the output of the model provides near optimal monopolistic price best attainable reduction in manufacturing emissions through proportional investment and makes a choice of suitable mode of transportation for each type of product offered by the firm three types of sensitivity analyses were performed by varying contextual parameters customers emission elasticity penalty charged per unit emission and investment coefficient the results underpin the importance of investments in cleaner technologies and the need of financial aids for profit maximizing firms operating in cleaner markets this work provides a decision making tool to determine the near optimal degree of each of the above dimension in multiple business fronts

design of sustainable supply chains under the emission trading scheme increase in environmental concerns together with legislations are forcing industries to take a fresh look at the impact of their supply chain operations on the environment this paper introduces a mixed integer linear programming based framework for sustainable supply chain design that considers life cycle assessment lca principles in addition to the traditional material balance constraints at each node in the supply chain indeed the framework distinguishes between solid and liquid wastes as well as gaseous emissions due to various production processes and transportation systems the framework is used to evaluate the tradeoffs between economic and environmental objectives under various cost and operating strategies in the aluminum industry the results suggest that current legislation and emission trading schemes ets must be strengthened and harmonized at the global level in order to drive a meaningful environmental strategy moreover the model demonstrates that efficient carbon management strategies will help decision makers to achieve sustainability objectives in a cost effective manner

inventory management under joint product recovery and cap and trade constraints abstract the influence of environmental legislation in inventory control policies is explored previous work on product recovery is extended using the introduction of a cap and trade mechanism in an infinite horizon inventory system in which demand and returns are uncertain demand is met through two different sources namely manufacturing and remanufacturing which differ in cost and greenhouse gas emissions the main contributions of this paper are 1 comparison of system operation in terms of cost and environmental performance under conventional and green inventory policies and 2 managerial insights into the structure of green inventory policies to illustrate the impact of a cap and trade scheme a numerical example is used we solved the problem as a markov decision process and characterized the inventory policies based on the optimal replenishment strategy we also conducted a sensitivity analysis to examine the effect of underlying environmental parameters such as the emission cap and the allowance price in the policy structures the results indicate that decisions are sensitive to carbon prices the inventory policy could play an important role in compliance with environmental legislation although there is threshold carbon price beyond which the company must focus on strategic decisions rather than tactical decisions

the credibility revolution in empirical economics how better research design is taking the con out of econometrics since edward leamer s memorable 1983 paper let s take the con out of econometrics empirical microeconomics has experienced a credibility revolution while leamer s suggested remedy sensitivity analysis has played a role in this we argue that the primary engine driving improvement has been a focus on the quality of empirical research designs the advantages of a good research design are perhaps most easily apparent in research using random assignment we begin with an overview of leamer s 1983 critique and his proposed remedies we then turn to the key factors we see contributing to improved empirical work including the availability of more and better data along with advances in theoretical econometric understanding but especially the fact that research design has moved front and center in much of empirical micro we offer a brief digression into macroeconomics and industrial organization where progress by our lights is less dramatic although there is work in both fields that we find encouraging finally we discuss the view that the design pendulum has swung too far critics of design driven studies argue that in pursuit of clean and credible research designs researchers seek good answers instead of good questions we briefly respond to this concern which worries us little

the role of co opetition in low carbon manufacturing abstract low carbon manufacturing has become a strategic objective for many developed and developing economies this study examines the role of co opetition in achieving this objective we investigate the pricing and emissions reduction policies for two rival manufacturers with different emission reduction efficiencies under the cap and trade policy we assume that the product demand is price and emission sensitive based on non cooperative and cooperative games the optimal solutions for the two manufacturers are derived in the purely competitive and co opetitive market environments respectively through the discussion and numerical analysis we uncovered that in both pure competition and co opetition models the two manufacturers optimal prices depend on the unit price of carbon emission trading in addition higher emission reduction efficiency leads to lower optimal unit carbon emissions and higher profit in both the pure competition and co petition models interestingly compared to pure competition co opetition will lead to more profit and less total carbon emissions however the improvement in economic and environmental performance is based on higher product prices and unit carbon emissions

timing and eco nomic efficiency of climate friendly investments in supply chains abstract emission trading schemes such as the european union emissions trading system euets attempt to reconcile economic efficiency with ecological efficiency by creating financial incentives for companies to invest in climate friendly innovations using real options methodology we demonstrate that under uncertainty economic and ecological efficiency continue to be mutually exclusive this problem is even worse if a climate friendly project depends on investing in of a whole supply chain we model a sequential bargaining game in a supply chain where the parties negotiate over implementation of a carbon dioxide co2 saving investment project we show that the outcome of their bargaining is not economically efficient and even less ecologically efficient furthermore we show that a supply chain becomes less economically efficient and less ecologically efficient with every additional chain link finally we make recommendations for how managers or politicians can improve the situation and thereby increase economic as well as ecological efficiency and thus also the eco efficiency of supply chains

on the distributional conditions for a consumption oriented three moment capm in this paper we develop sufficient conditions on probability distributions for a three moment mean variance and skewness consumption oriented capital asset pricing model capm to price correctly a subset of assets the assumptions that individuals in an allocationally efficient capital market have identical probability beliefs and monotone increasing strictly concave utility functions displaying nonincreasing absolute risk aversion imply an aggregate preference function that exhibits preference for expected return aversion to variance of return and preference for positive skewness for otherwise arbitrary preferences we show that quadratic characteristic lines are sufficient for a subset of assets to be priced according to a three moment consumption oriented capm

the meaning of failed replications a review and proposal the welcome rise of replication tests in economics has not been accompanied by a consensus standard for determining what constitutes a replication a discrepant replication in current usage of the term can signal anything from an unremarkable disagreement over methods to scientific incompetence or misconduct this paper proposes a standard for classifying one study as a replication of some other study it is a standard that places the burden of proof on a study to demonstrate that it should have obtained identical results to the original a conservative standard that is already used implicitly by many researchers it contrasts this standard with decades of unsuccessful attempts to harmonize terminology and argues that many prominent results described as replication tests should not be described as such adopting a conservative standard like this one can improve incentives for researchers encouraging more and better replication tests

are all economic facts greatly exaggerated theory competition and selectivity there is growing concern and mounting evidence of selectivity in empirical economics most empirical economic literatures have a truncated distribution of results the aim of this paper is to explore the link between publication selectivity and theory contests this link is confirmed through the analysis of 87 distinct empirical economics literatures involving more than three and a half thousand separate empirical studies using objective measures of both selectivity and contests our meta meta analysis shows that publication selection is widespread but not universal it distorts scientific inference with potentially adverse effects on policy making but competition and debate between rival theories reduces this selectivity and thereby improves economic inference

the carbon constrained eoq model with carbon emission dependent demand abstract currently companies are looking for solutions to reduce carbon emissions associated with their operations operational adjustments such as modifications in batch sizes or order quantities have proven to be an effective way to decrease emissions in this paper a novel model is proposed that takes into account the link between an inventory policy eoq total carbon emissions and both price and environmental dependent demands in the case of an exogenous price two optimal quantities are determined which maximize a retailer s profit and which minimize carbon emissions conditions that allow a company to maximize profit while minimizing emissions and mechanisms that allow a firm to maximize its profit and to decrease its carbon emissions are determined in the case of an endogenous price some empirical results are also discussed when a firm optimizes its profit through both its selling price and its order quantity some experiments match empirical observations on the one hand an environmental strategy is more significant for cheaper and green labeled products on the other hand a public mechanism such as a carbon tax will decrease total and marginal emissions

dangerous interconnectedness economists conflicts of interest ideology and financial crisis this study investigates potential conflicts of interest among academic economists and some measures to address them we investigated the financial affiliations of 19 prominent academic financial economists who were associated with two economist groups proposing financial reform measures in the wake of the 2008 financial crisis we assessed whether they had private financial affiliations and identified the degree to which these economists disclosed these affiliations in their academic and media publications from 2005 to 2009 and again from january 2011 through april 2011 we found that private affiliations were common but that these academic economists disclosed these affiliations infrequently and inconsistently we advocate the adoption of a code of ethics by the economics profession similar to those commonly implemented by other disciplines prescribing more transparent conduct for economists facing such potential conflicts of interest

what s to know about the credibility of empirical economics the scientific credibility of economics is itself a scientific question that can be addressed with both theoretical speculations and empirical data in this review we examine the major parameters that are expected to affect the credibility of empirical economics sample size magnitude of pursued effects number and pre selection of tested relationships flexibility and lack of standardization in designs definitions outcomes and analyses financial and other interests and prejudices and the multiplicity and fragmentation of efforts we summarize and discuss the empirical evidence on the lack of a robust reproducibility culture in economics and business research the prevalence of potential publication and other selective reporting biases and other failures and biases in the market of scientific information overall the credibility of the economics literature is likely to be modest or even low

a co moment criterion for the choice of risky investment by firms this paper uses taylor series expansions and the assumption of small risks to derive a co moment criterion that firms should maximize so that the resulting equilibrium is pareto optimal this is done in two models of production under uncertainty the state of nature sn model in which the firms outputs depend on states of nature and financial markets are complete with respect to these states of nature and the probability p model in which the firms risky outputs are modeled by their joint probabilities and financial markets span the outcome space of the firms the theoretical criterion in the sn model is market value maximization while in the p model it is maximization of a firm s contribution to social welfare we show that both criteria can be transformed into a common co moment criterion which a firm should maximize taking as given the production decisions of other firms and the co moment prices which can be deduced from the security prices the co moment criterion provides a unifying framework for the two equilibrium models of production under uncertainty has the merit of being based on information which is readily available to firms and provides greater insight than the theoretical criterion into the risk characteristics of its profit stream which a firm should focus on when choosing its investment plan

systemic risk and international portfolio choice returns on international equities are characterized by jumps moreover these jumps tend to occur at the same time across countries leading to systemic risk we capture these stylized facts using a multivariate system ofjump diffusion processes where the arrival of jumps is simultaneous across assets we then determine an investor s optimal portfolio for this model of returns systemic risk has two effects one it reduces the gains from diversification and two it penalizes investors for holding levered positions we find that the loss resulting from diminished diversification is small while that from holding very highly levered positions is large returns on international equities are characterized by jumps 1 moreover these jumps tend to occur at the same time across countries implying that conditional correlations between international equity returns tend to be higher in periods of high market volatility or following large downside moves 2 our objective in

alcohol marketing adolescent drinking and publication bias in longitudinal studies a critical survey using meta analysis this paper presents a meta analysis of prospective cohort longitudinal studies of alcohol marketing and adolescent drinking which accounts for publication bias the paper provides a summary of 12 primary studies of the marketing drinking relationship each primary study surveyed a sample of youth to determine baseline drinking status and marketing exposure and re surveyed the youth to determine subsequent drinking outcomes logistic analyses provide estimates of the odds ratio for effects of baseline marketing variables on adolescent drinking at follow up using meta regression analysis two samples are examined in this paper 23 effect size estimates for drinking onset initiation and 40 estimates for other drinking behaviours frequency amount bingeing marketing variables include ads in mass media promotion portrayals brand recognition and subjective evaluations by survey respondents publication bias is assessed using funnel plots that account for missing studies bivariate regressions and multivariate meta regressions that account for primary study heterogeneity heteroskedasticity data dependencies publication bias and truncated samples the empirical results are consistent with publication bias omitted variable bias in some studies and lack of a genuine effect especially for mass media the paper also discusses dissemination bias in the use of research results by primary investigators and health policy interest groups

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

an examination of the reliability of prestigious scholarly journals evidence and implications for decision makers in universities all over the world hiring and promotion committees regularly hear the argument this is important work because it is about to appear in prestigious journal x moreover those who allocate levels of research funding such as in the multi billion pound research assessment exercise in uk universities often come under pressure to assess research quality in a mechanical way by using journal prestige ratings this paper s results suggest that such tendencies are dangerous it uses total citations over a quarter of a century as the criterion the paper finds that it is far better to publish the best article in an issue of a medium quality journal like the oxford bulletin of economics and statistics than to publish the worst article or often the worst 4 articles in an issue of a top journal like the american economic review implications are discussed

an empirical investigation of green purchase behaviour among the young generation due to an increasing awareness in environmental impact consumers are more sensitive towards green products when making their purchasing decisions the young generation who represents the future of our society seems to have a different attitude and belief which enables them to reflect on their choice of green products this research empirically examines the influence of ecological affect and ecological knowledge on the green purchasing behaviour of the young generation a survey was administered to young consumers between the age of 18 and 30 structural equation modelling was applied to test the hypotheses the analysis result confirms that the ecological effect and knowledge are significant in determining young consumers green involvement as well as their actual purchase

how many parts to make at once reprinted from factory the magazine of management volume 10 number 2 february 1913 pp 135 136 152 interest on capital tied up in wages material and overhead sets a maximum limit to the quantity of parts which can be profitably manufactured at one time set up costs on the job fix the minimum experience has shown one manager a way to determine the economical size of lots

impact of product pricing and timing of investment decisions on supply chain co opetition abstract in supply chain co opetition firms simultaneously compete and co operate in order to maximize their profits we consider the nature of co opetition between two firms the product supplier invests in the technology to improve quality and the purchasing firm buyer invests in selling effort to develop the market for the product before uncertainty in demand is resolved we consider three different decision making structures and discuss the optimal configuration from each firm s perspective in case 1 the supplier invests in product quality and sets the wholesale price for the product the buyer then exerts selling effort to develop the market and following demand potential realization sets the resale price in case 2 the supplier invests in product quality followed by the buyer s investment in selling effort then after demand potential is observed the supplier sets the wholesale price and the buyer sets the resale price finally in case 3 both firms simultaneously invest in product quality and selling effort respectively subsequently observing the demand potential the supplier sets the wholesale price and the buyer sets the resale price we compare all configuration options from both the perspective of the supplier and the buyer and show that the level of investment by the firms depends on the nature of competition between them and the level of uncertainty in demand our analysis reveals that although configuration 1 results in the highest profits for the integrated channel there is no clear dominating preference on system configuration from the perspective of both parties the incentives of the co opetition partners and the investment levels are mainly governed by the cost structure and the level of uncertainty in demand we examine and discuss the relation between system parameters and the incentives in desiging the supply contract structure

transforming sustainability challenges into competitive advantage multiple case studies kaleidoscope converging into sustainable business models abstract recent tendency has been pushing organizations to rethink their role in society and making organization reflect that profit may not be the only and foremost important business performance criteria thus recent literature has been exploring the sustainable business models sbm s as a way to insert sustainability goals into the core of business decisions this research aims to advance in this body of knowledge and proposes a theory and practice based framework to support organizations towards more sbm making explicit main elements to align business to sustainability performance goals to support the argument that there is no unique solution to design sbm this research performs a multiple case studies in eleven organizations from diverse sectors situated in brazil and in the united kingdom results show that sbm is not an attempt to deny business as usual perspective but rather it seeks to complement this view by adding a more axiological and systemic approach in particular three convergent aspects were identified in the case studies as relevant efforts support the integration of sustainability into sbm s value creation and delivery system 1 the connection between business purpose and employees values and believes 2 the pro active and clear engagement in solving sustainability problems and 3 the need for system level changes to enable successful sbm s this systemic thinking is highlighted by the concept emerged from the research the cascaded sustainable value captured representing that as sbm s are part of a value network value delivered by the organizations is captured not only by stakeholders to which they have direct contact but rather this is also deployed to stakeholders of focal company s stakeholders this distinction is not always trivial for companies so the proposed concept can support advances in sbm discussions further studies are called to the challenge of making explicit that sbm s are not only companies that directly addresses a specific social and or environmental problem but rather is an emerging paradigm on how to manage efficient businesses in any sector to add positive value to the globe

including sustainability criteria into inventory models research on sustainability performance has considerably enriched operations management literature in recent years however work with quantitative models is still scarce this paper contributes by revisiting classical inventory methods taking sustainability concerns into account we believe that reducing all aspects of sustainable development to a single objective is not desirable we thus reformulate the classical economic order quantity model as a multiobjective problem we refer to this model as the sustainable order quantity model then a multi echelon extension of the sustainable order quantity model is studied for both models the set of efficient solutions pareto optimal solutions is analytically characterized these results are used to provide some insights about the effectiveness of different regulatory policies to control carbon emissions we also use an interactive procedure that allows the decision maker to quickly identify the best option among these solutions the proposed interactive procedure is a new combination of multi criteria decision analysis techniques

a century of evolution from harris s basic lot size model survey and research agenda abstract determining the economic lot size has always represented one of the most important issues in production planning this problem has long attracted the attention of researchers and several models have been developed to meet requirements at minimum cost in this paper we explore and discuss the evolution of these models during one hundred years of history starting from the basic model developed by harris in 1913 up to today following harris s work a number of researchers have devised extensions that incorporate additional considerations the evolution of eoq theory strongly reflects the development of industrial systems over the past century here we outline all the research areas faced in the past by conducting a holistic analysis of 219 selected journal papers and trying to give a comprehensive view of past work on the eoq problem finally a new research agenda is proposed and discussed

a sustainable production inventory model for a controllable carbon emissions rate under shortages abstract carbon emissions are the key factor of global warming nowadays some countries have focused on reducing carbon emission carbon tax and cap policies are the key mechanism utilized in many countries to achieve this keeping this issue in mind a sustainable economic production quantity sepq carbon tax and cap model has considered for a controllable carbon emissions rate by investing in green technology gt efforts under different with and without shortage situations this study has three models a a sustainable economic production quantity carbon tax and cap model with no shortages b a sustainable economic production quantity carbon tax and cap with partial backordering and c a sustainable economic production quantity carbon tax and cap with full backordering with and without green technology investment a solution methodology has been proposed for determining the optimal strategies of cycle time green technology investment and the fraction period length in positive inventory level several numerical examples have studied to validate the sustainable economic production quantity models the results of this paper are a sustainable economic production quantity carbon tax and cap partial backlogging case has a better justifiable profit with the highest cycle time and the lowest value of the fraction length period as well as the lower green technology investment cost compared with other models finally sensitivity analysis has provided with the managerial implication of the optimal feasible solution with respect to some key parameters

managing carbon footprints in inventory management abstract there is a broad consensus that mankind must reduce carbon emissions to mitigate global warming it is generally accepted that carbon emission trading is one of the most effective market based mechanisms to curb the amount of carbon emissions this paper investigates how firms manage carbon footprints in inventory management under the carbon emission trading mechanism we derive the optimal order quantity and analytically and numerically examine the impacts of carbon trade carbon price and carbon cap on order decisions carbon emissions and total cost we make interesting observations from the numerical examples and provide managerial insights from the analytical results

how credible is trade union research forty years of evidence on the monopoly voice trade off this article is the second in a series to celebrate the 70th anniversary of the ilr review the series features articles that analyze the state of research and future directions for important themes this journal has featured over many years of publication in this article the authors assess the credibility of research that has tested the theoretical contests between the monopoly and the collective voice model of unions developed by freeman and medoff in what do unions do the authors go beyond prior analyses by examining more than 2 000 estimates that consider the effects of unions on a broad range of organizational and individual outcomes including productivity productivity growth capital investment profits and job satisfaction they advance our understanding of the current empirical findings and credibility of this research by using meta statistical analysis to evaluate research quality publication selection bias statistical power and heterogeneity the authors conclude that compared to other ar

optimizing cooperative carbon emission reduction among enterprises with non equivalent relationships subject to carbon taxation abstract getting enterprises to reduce carbon emissions cooperatively is an effective way of sharing the burden of carbon taxation it is easier for core enterprises to promote cooperation because of their dominant positions in the supply chain the main goal of this paper is to provide a potential method for the core enterprise to organize this cooperation successfully we explore how core enterprises should allocate their reduction investments and coordinate the selection of technology upgrade strategies so as to maximize their profits without disrupting the profits of cooperating enterprises for a supply chain where there are non equivalent relationships between enterprises the main hypotheses are that each enterprise only produces one product and each production process in each enterprise can only select one production technology and the intermediate products are mainly traded among cooperative enterprises a model based on independent carbon emission reduction model i is first constructed and used to analyze each enterprises basic information when they reduce carbon emission without cooperation considering total costs profits and so on then based on this information a model including cooperation is proposed model ii in model ii the enterprises are divided into core and cooperative enterprises and both capital and technical cooperation are considered a multi agent system is presented to simulate the negotiations between the enterprises and is then used to solve model ii finally a numerical example is considered to examine the feasibility of the proposed model the results indicate that a cooperative carbon emission reduction strategy has more advantages than the independent carbon emission reduction approach a notable advantage is that it can further rationalize the emission reduction structure of the supply chain through rational allocation of reduction investments and thus further restores profits

the effects of emission trading on production and inventories in the arrow karlin model abstract the paper deals with the effect of introduction of tradable permits on the production inventory strategy of a firm it is assumed that the firm will minimize its costs the cost function consists of linear holding and convex production costs after introducing emission trading the cost function will contain a linear emission procurement selling cost we will compare the optimal production inventory strategy before tradable permits and thereafter the mathematical investigation is based on the well known dynamic arrow karlin model

a theory of consumer boycotts under symmetric information and imperfect competition this article models strategic interactions between non identical duopolistic firms and a public interest environmental organisation eo that promotes green production practices by threatening consumer boycotts against brown producers the article describes when boycotts are deterred by prior firm commitments to be green and also when a boycott arises in equilibrium despite symmetric information when a boycott arises it is either a small persistent boycott against the small firm in the industry or a large transitory boycott against the large firm in the industry that prompts the target firm to accede to the boycott demands quickly

portfolio selection and asset pricing three parameter framework idiosyncratic security risks are modelled as following a joint spherical distribution characterized by a mean vector and a generalized covariance matrix skewness is generated by a single factor for the whole economy but upon which different securities have different loadings this results in three fund separation two funds to span the spherical risk and one more fund to span the additional skewness risk a three parameter normative portfolio analysis that allows short sales restrictions is developed in addition a three parameter capital asset pricing model is provided

environmentally responsible inventory models non classical models for a non classical era abstract mathematical models of inventory typically include the three inventory associated costs of surplus shortage and ordering these classic inventory models are then analysed so as to choose inventory parameters that usually minimise the total cost of operating the inventory system being investigated unfortunately classic inventory models do not provide a meaningful basis for analysing many real and increasingly important practical inventory problems and situations it is therefore not surprising that over recent years several authors have discussed these issues in broad terms and suggested that a new paradigm needs to be developed this paper develops some specific aspects of this discussion in particular the paper identifies a range of inventory problems that are not covered appropriately by traditional inventory analysis one of these is to design responsible inventory systems i e systems that reflect the needs of the environment the paper then examines the importance of inventory planning to the environment in greater detail for example packaging is important not only because of its costs and the protection that it provides to the inventory items but also because of its eventual effects on the environment in terms of the use of resources and potential landfill for similar reasons waste which can result from poor inventory management is highly important the location of stores is important because location affects transport costs thus the influence of the secondary aspects of most inventory models packaging waste and location are important but even more important are the inter relations with the total system in particular the location of the manufacturing plants and the effect that inventory planning has on the logistics chain potentially have considerable environmental implications inventory is part of a wider system however until the cost charged for an activity reflects the true environmental cost of that activity it is likely that decisions will be made on the basis of erroneous data in that situation we are faced with either determining the environmental cost of specific actions or to use environmental costs that are somewhat contrived in which case it may be more sensible to use very different performance measures and models the paper discusses these ideas and ways in which inventory policies may reassure us with our environmental concerns

the power of bias in economics research we investigate two critical dimensions of the credibility of empirical economics research statistical power and bias we survey 159 empirical economics literatures that draw upon 64 076 estimates of economic parameters reported in more than 6 700 empirical studies half of the research areas have nearly 90 of their results under powered the median statistical power is 18 or less a simple weighted average of those reported results that are adequately powered power 80 reveals that nearly 80 of the reported effects in these empirical economics literatures are exaggerated typically by a factor of two and with one third inflated by a factor of four or more

a comparative analysis of greening policies across supply chain structures abstract in this paper we examine an apparel serial supply chain whose players initiate product greening we consider situations in which the players cooperate or act individually our problem is motivated by recent developments in the supply chains of global apparel players we build game theoretic models and show how greening levels prices and profits are influenced by channel structures we also study the impact of greening costs and consumer sensitivity towards green apparels we propose a two part tariff contract to coordinate the green channel our key contribution lies in the model of decision making of various supply chain structures and analyzing its impact on the players and supply chain the problem throws interesting insights into the strategies of apparel players and their key decisions

arbitrage equilibrium with skewed asset returns the quadratic form of the covariance co skewness model by kraus and litzenberger and arbitrage pricing theory are used for an empirical investigation of market equilibrium with skewed seecurity returns empirical tests similar to the ones in black jensen scholes and gibbons are discussed the empirical estimates give some support to the kraus litzenberger hypothesis on skewness preference however there is some evidence that the tested arbitrage equilibrium is not a complete description of security pricing

transitional politics emerging incentive based instruments in environmental regulation abstract this paper proposes a positive theory of environmental instrument choice we study a democratic society that seeks to lower the level of pollution from industrial sources to a pre specified target the target can be implemented by one of three instruments s uniform emission standards p tradeable permits and t emission taxes the conflict of interest between special interests representing polluters and the electorate is resolved by an elected politician we characterize when each of the three policy instruments is chosen in political equilibrium and show that the transition observed in many countries from s to either p or t can be understood as a natural consequence of increasingly ambitious environmental targets

tax subsidy policies in the presence of environmentally aware consumers abstract we study policy measures to improve environmental quality in the presence of environmentally aware consumers we consider two sets of policy instruments uniform policies for the firms and policies that discriminate between the firms based on their environmental quality for the latter set either the better performer is rewarded with a subsidy or the worse performer is punished with a tax we find that while a uniform subsidy policy improves average environmental quality a uniform tax policy worsens it further while a discriminatory subsidy policy reduces total pollution and enhances aggregate welfare a discriminatory tax policy may increase total pollution and may reduce aggregate welfare

beta in linear risk tolerance economies this paper employs numerical means to examine i the expected return beta plot in power utility linear risk tolerance lrt economies and ii whether in the power utility economies a valuation equation containing covariance and coskewness terms might better explain expected returns than one containing covariance terms alone the results show that the expected return beta plots constructed from real world return distributions are very similar to the plots found in empirical tests of the mean variance capital asset pricing model mv capm hence a power utility lrt capm may provide a better theory of asset pricing than the mv capm does while beta is not the correct measure of risk in power utility lrt economies the results show that on average a valuation equation containing covariance terms only explains expected returns better than a valuation equation containing both covariance and coskewness terms

multi item production planning with carbon cap and trade mechanism abstract carbon emission control becomes a challenge in recent years and carbon emission trading is an effective way to curb carbon emission this paper investigates the multi item production planning problem with carbon cap and trade mechanism in which a firm uses a common capacity and carbon emission quota to produce multiple products for fulfilling independent stochastic demands and the firm can buy or sell the right to emit carbon on a trading market of carbon emission a profit maximization model is proposed to characterize the optimization problem the optimal policy of production and carbon trading decisions is analyzed and an efficient solution method with linear computational complexity is presented for solving the optimal solution the impacts of carbon price carbon cap on the shadow price of the common capacity production decisions carbon emission and the total profit are investigated the comparisons of the carbon cap and trade policy and the taxation policy are given to show the effectiveness of the policies numerical analyses are presented for illustrating our findings and obtaining some managerial insights and policy implication

the single period inventory model under dual sourcing and product carbon footprint constraint abstract important drivers for environmental sustainability efforts in purchasing and supply management are top management initiatives and compliance with laws and regulations on the other hand market forces are largely ignored although it is shown that the product carbon footprint contained on the product s eco label influences the purchasing decisions of consumers if it is disclosed by several companies in an industry then the product carbon footprint turns out to be a relevant competitive differentiator i e the company with lower emissions can increase its market share in this paper we consider the single period inventory model with product carbon footprint constraint an upper bound for the carbon footprint is specified as a benchmark derived either from the company s environmental target or from an industry standard in the case of one supply option the optimal order quantity is characterized by a one sided control limit policy especially for high profit products the environmental constraint is binding thus has a negative impact on the economic performance i e expected profit if a second supply option exists in the resulting dual sourcing framework with quick response two scenarios with different additional costs and emissions for the second emergency order are considered in the first scenario for both options the same supplier is used it applies to an offshore supplier because a fast transportation mode is considered here the structure of the optimal first order quantity is a two sided control limit policy in scenario two the second order comes from a different onshore supplier by comparing the fast and the onshore scenario the trade off between economic expected profit and environmental expected emissions performances is discussed

replication in empirical economics the journal of money credit and banking project this paper examines the role of replication in empirical economic research it presents the findings of a two year study that collected programs and data from authors and attempted to replicate their published results the research provides new and important information about the extent and causes of failures to replicate published results in economics the findings suggest that inadvertent errors in published empirical articles are a commonplace rather than a rare occurence copyright 1986 by american economic association

analyzing the impacts of carbon regulatory mechanisms on supplier and mode selection decisions an application to a biofuel supply chain this paper analyzes the impacts of carbon regulatory mechanisms on replenishment decisions in a biofuel supply chain we employ mathematical models for operations which integrate replenishment and supplier transportation mode selection decisions these models explicitly account for carbon emissions that may result from transportation and inventory storage activities this research is motivated by observations indicating that nearly 19 of the energy consumption and 25 of the energy related carbon dioxide emissions worldwide arise from transportation because freight transportation is expected to continue to grow we consider the impacts of different carbon regulatory mechanisms on transportation and inventory replenishment decisions in a biofuel supply chain a set of extensive numerical experiments uses the biofuel supply chain context to analyze the impacts of different regulatory mechanisms including carbon cap carbon tax carbon cap and trade and carbon offset on performance we use existing methodologies to calculate emissions as a function of distance traveled load weight and transportation mode used we also use publicly available data to derive representative biomass transportation costs as a consequence our numerical results are meaningful and give a realistic representation of the relationships between emissions from different transportation modes and the resulting costs the results of our computational experiments indicate that carbon regulatory mechanisms have a non trivial impact on replenishment schedules and as a consequence costs and emissions in the supply chain

integrated economic and environmental models for a multi stage cold supply chain under carbon tax regulation abstract the elevated level of public and organizations awareness concerning sustainability has necessitated the adoption of environmentally conscious practices in the management of supply chains as such classical inventory models wherein the sole measure of performance is cost minimization are no longer appropriate to handle such emerging and pressing issue this paper assesses the impact of accounting for carbon emissions resulting from transportation and storage activities of a cold item in the context of a multi stage supply chain comprised of a plant warehouse a distribution center dc and a retailer we present an operational cost minimization model a carbon footprint minimization model and a hybrid economic and environmental minimization model where all models seek to determine the optimal lot sizing and shipping quantities alongside the number of trucks to be used in the upstream and downstream directions of the supply chain as well as the number of freezer units utilized at the dc which is owned by a third party logistics provider the structural properties for the optimal solution of the three models are identified and solution algorithms are also proposed upon conducting computational experiments it turns out that the incorporation of carbon related costs through carbon tax regulation may call for adjusting the adopted operational policy which results in a minor increase in the operational cost however this increase is outweighed by the savings resulting from the carbon related costs numerical results of the sensitivity analysis on the carbon tax policy indicate that as the tax rate increases substantial reductions in the amount of carbon footprint emitted are realized and cost savings are also achieved when adopting the lot sizing and shipping policy of the third integrated model over the operational cost minimization model

conditional coskewness in stock and bond markets time series evidence in the context of a three moment intertemporal capital asset pricing model specification we characterize conditional coskewness between stock and bond excess returns using a bivariate regime switching model we find that both conditional u s stock coskewness the relation between stock return and bond volatility and bond coskewness the relation between bond return and stock volatility command statistically and economically significant negative ex ante risk premiums the impacts of stock and bond coskewness on the conditional stock and bond premiums are quite robust to various model specifications and various sample periods and also hold in another major developed country the united kingdom the findings also carry important implications for portfolio management