energy consumption and economic growth relationship evidence from panel data for low and middle income countries abstract this paper uses the panel data of energy consumption ec and economic growth gdp for 51 countries from 1971 to 2005 these countries are divided into three groups low income group lower middle income group and upper middle income group countries firstly a relationship between energy consumption and economic growth is investigated by employing pedroni 1999 panel cointegration method secondly panel causality test is applied to investigate the way of causality between the energy consumption and economic growth finally we test whether there is a strong or weak relationship between these variables by using pedroni 2001 method the empirical results of this study are as follows i energy consumption and gdp are cointegrated for all three income group countries ii the panel causality test results reveal that there is long run granger causality running from gdp to ec for low income countries and there is bidirectional causality between ec and gdp for middle income countries iii the estimated cointegration factor is not close to 1 in other words no strong relation is found between energy consumption and economic growth for all income groups considered in this study the findings of this study have important policy implications and it shows that this issue still deserves further attention in future research

fdi and income inequality evidence from a panel of u s states this study employs state level panel data to explore the relationship between inward foreign direct investment fdi and income inequality in the united states using panel cointegration techniques that allow for cross sectional heterogeneity cross sectional dependence and endogenous regressors we find that the short run effects of fdi on income inequality are insignificant or weakly significant and negative in the long run however fdi exerts a significant and robust negative effect on income inequality in the united states this result for the united states as a whole does not imply that fdi narrows income gaps in the long run in each individual state there is considerable heterogeneity in the long run effects of fdi on income inequality across states with some states 21 out of 48 cases exhibiting a positive relationship between fdi in income inequality

optimal pricing shipment and payment policy for an integrated supplier buyer inventory model with two part trade credit abstract in this article we develop an integrated supplier buyer inventory model with the assumption that the market demand is sensitive to the retail price and the supplier adopts a trade credit policy the trade credit policy discussed in this paper is a two part strategy cash discount and delayed payment that is if the buyer pays within m1 the buyer receives a cash discount otherwise the full purchasing price must be paid before m2 where m 2 m 1 0 the objective of this research is to determine the optimal pricing ordering shipping and payment policy to maximize the joint expected total profit per unit time an iterative algorithm is established to obtain the optimal strategy furthermore numerical examples and sensitivity analysis are presented to illustrate the results of the proposed model and to draw managerial insights

channel coordination and quantity discounts this paper presents a model for analyzing the impact of joint decision policies on channel coordination in a system consisting of a supplier and a group of homogeneous buyers the joint decision policy characterized by the unit selling price and the order quantity is coordinated through quantity discounts and franchise fees both the annual demand rate and the operating cost including the purchase ordering and inventory holding costs depend on the joint decision policy employed this paper contributes by integrating work addressing quantity discounts on inventory and ordering policies and work focusing on the control mechanism provided by quantity discounts in channel coordination it is shown that the optimal all unit quantity discount policy is equivalent to the optimal incremental quantity discount policy in achieving channel coordination furthermore it is shown that quantity discounts alone are not sufficient to guarantee joint profit maximization the analyses of the general models are illustrated by specific analytical results obtained for a given demand function

a dynamic panel study of economic development and the electricity consumption growth nexus abstract this study examines the relationship between electricity consumption and economic growth for 88 countries categorized into four panels based on the world bank income classification high upper middle lower middle and low income within a multivariate panel framework over the period 1990 2006 the larsson et al 2001 panel cointegration test indicates there is a long run equilibrium relationship between real gdp coal consumption real gross fixed capital formation and the labor force for the high upper middle and lower middle income country panels the results from the panel vector error correction models reveal 1 bidirectional causality between electricity consumption and economic growth in both the short and long run for the high income and upper middle income country panels 2 unidirectional causality from electricity consumption to economic growth in the short run but bidirectional causality in the long run for the lower middle income country panel and 3 unidirectional causality from electricity consumption to economic growth for the low income country panel

reply on comments on a quantity discount pricing model to increase vendor profits professor joglekar is to be thanked for his generally insightful comments 1988 concerning my paper monahan monahan j p 1984 a quantity discount pricing model to increase vendor points management sci 306 june 720 726 he has in my view correctly assessed the limitations of two important production assumptions i made assumptions which need to be rethought in any quantity discount pricing models of the future yet although i find myself in general agreement with joglekar s comments i wish to clarify some points concerning the model and its potential applicability

long run relation and short run dynamics in energy consumption output relationship international evidence from country panels with different growth rates the long run relation and short run dynamics between output and consumption of energy electricity are examined in panels of countries with different growth rates seventy nine countries over 1971 2011 are grouped into high low and negative growth categories based on exponential growth rate of their per capita output tests of cointegration suggest the existence of long run relation between energy electricity consumption and output in high and low growth panels but its absence in the panel with negative growth accounting for cross country dependency strengthens the findings estimates of long run elasticity of output with respect to energy electricity are significant in panels with positive growth rates the common correlated effect mean group estimators of the error correction model suggest 1 long run bidirectional causality between output and energy electricity in all three groups of countries 2 short run bidirectional causality in output energy relation for the full sample as well as in the low growth category and 3 unidirectional causality from output to energy in the negative growth category the finding of long run bidirectional causality is robust to inclusion of carbon emission urbanization exports and foreign direct investment as control variables

the relationship between gdp and electricity consumption in 10 asian countries the purpose of this study is to estimate the relationships between gdp and electricity consumption in 10 newly industrializing and developing asian countries using both single data sets and panel data procedures the empirical results from single data set indicate that the causality directions in the 10 asian countries are mixed while there is a uni directional short run causality running from economic growth to electricity consumption and a bi directional long run causality between electricity consumption and economic growth if the panel data procedure is implemented these empirical findings imply that electricity conservation policies through both rationalizing the electricity supply efficiency improvement to avoid the wastage of electricity and managing demand side to reduce the electricity consumption without affecting the end user benefits could be initiated without adverse effect on economic growth the findings on the long run relationship indicate that a sufficiently large supply of electricity can ensure that a higher level of economic growth

electricity consumption real gdp causality nexus evidence from a bootstrapped causality test for 30 oecd countries the goal of this paper is to examine any causal effects between electricity consumption and real gdp for 30 oecd countries we use a bootstrapped causality testing approach and unravel evidence in favour of electricity consumption causing real gdp in australia iceland italy the slovak republic the czech republic korea portugal and the uk the implication is that electricity conservation policies will negatively impact real gdp in these countries however for the rest of the 22 countries our findings suggest that electricity conversation policies will not affect real gdp

energy consumption real income and temporal causality results from a multi country study based on cointegration and error correction modelling techniques abstract unlike previous studies on the causal relationship between energy consumption and economic growth this paper illustrates how the finding of cointegration i e long term equilibrium relationship between these variables may be used in testing granger causality based on the most recent johansen s multivariate cointegration tests preceded by various unit root or non stationarity tests we test for cointegration between total energy consumption and real income of six asian economies india pakistan malaysia singapore indonesia and the philippines non rejection of cointegration between variables rules out granger non causality and imples at least one way of granger causality either unidirectional or bidirectionial secondly by using a dynamic vector error correction model we then analyse the direction of granger causation and hence the within sample granger exogeneity or endogeneity of each of the variables thirdly the relative strength of the causality is gauged through the dynamic variance decomposition technique by decomposing the total impact of an unanticipated shock to each of the variables beyond the sample period into proportions attributable to shocks in the other variables including its own in the bivariate system results based on these tools of methodology indicate that while all pair wise relationships shared common univariate integrational properties only relationships for three countries india pakistan and indonesia were cointegrated for these countries temporal causality results were mixed with unidirectional causality from energy to income for india exactly the reverse for indonesia and mutual causality for pakistan the vdcs were not inconsistent with these results and provided us with an additional insight as to the relatively more dominant direction of causation in pakistan simple bivariate vector autoregressive models for the three non cointegrated systems did not indicate any direction of causality significantly in either direction

energy consumption and gdp causality relationship in g 7 countries and emerging markets abstract the causality relationship between energy consumption and income is a well studied topic in energy economics this paper studies the time series properties of energy consumption and gdp and reexamines the causality relationship between the two series in the top 10 emerging markets excluding china due to lack of data and g 7 countries we discover bi directional causality in argentina causality running from gdp to energy consumption in italy and korea and from energy consumption to gdp in turkey france germany and japan hence energy conservation may harm economic growth in the last four countries

optimal strategy for an integrated system with variable production rate when the freight rate and trade credit are both linked to the order quantity abstract this paper presents an integrated inventory model with variable production rate and price sensitive demand rate the buyer s purchases trade credit linked to the order quantity offered by the supplier in addition the buyer pays the freight charge according to a weight schedule this paper attempts to offer a best policy that aims at maximizing the joint total profit while the trade credit and freight rate are simultaneously linked to the order quantity the same policy also incorporates considerations on the optimal retail price order quantity and delivery decision we provide possible solutions for the buyer and the supplier to collaboratively agree on inventory control warehouse management transportation logistics delivery and billing our study demonstrates that significant profit increase for the entire supply chain can be achieved by linking both trade credit policy and freight rate policy to order quantities an algorithm is furnished to determine the optimal solution in addition numerical examples and sensitivity analysis are presented to illustrate the theoretical results

a classification of literature on determining the lot size under quantity discounts abstract determining a lot size in the presence of either all units or incremental discounts has represented one of major interests of materials managers it is a common practice that the suppliers offer quantity discount to entice the buyers to purchase more and to achieve economies of scale for transportation and processing costs this paper will classify the literature on lot sizing determination under several types of discount schemes and discuss some of the significant literature in this area over two decades also some future research areas have been identified

integrated pricing and lot sizing decision in a two echelon supply chain with a finite production rate abstract in this paper we consider a supply chain consisting of a supplier and a retailer selling the product manufactured by the supplier in a market in which the demand for the product is decreasing in the price set by the retailer previous research on coordinating the supply chain with price sensitive demand often assumes that either the supplier purchases the product or the supplier has an infinitely large production rate we consider explicitly the supplier s finite production rate in the pricing and lot sizing decision which causes the problem much more challenging we first investigate the optimization problem in the decentralized scenario to find the optimal order quantity and selling price for the retailer as well as the optimal wholesale price and lot size multiplier for the supplier we then solve the joint optimization problem in the centralized supply chain to find the optimal order quantity the selling price and the optimal lot size multiplier we provide two sequential algorithms to solve the joint optimization problem computational experiments show that the algorithms are effective all 448 tested problems are solved optimally and efficient it only takes a few iterations to converge for each tested problem the supply chain coordination mechanism is then designed through an all unit quantity discount policy and a franchise fee

a co ordination model combining incentive scheme and co ordination policy for a single vendor multi buyer supply chain abstract incentive scheme and co ordination policy are substantial components for the co ordination of a decentralized supply chain system but there is little work combining the two components as a single decision model li and wang 2007 this paper proposes a model which incorporates both incentive and co ordination issues into a single co ordination model for a single vendor multi buyer supply chain in the proposed model the co ordination is achieved by synchronizing ordering and production cycles while price discount which is based on the buyers order intervals is used as the incentive to motivate buyers to participate in the co ordination while the vendor is benefited from the co ordination by synchronized cycles the proposed price discount scheme can guarantee that a buyer s total relevant cost of co ordination will be reduced when compared with independent optimization more importantly the proposed price discount scheme does not require any cost information from the buyers

on the validity of aggregate models in designing supply chain contracts abstract the vast majority of the existing papers on supply chain contracts analyse these contracts based on a highly aggregate model description of the supply chain recognizing the high complexity of real supply chain systems such models can naturally only be rough approximations of reality out of the many possible ways for aggregating a planning model our study focuses on item aggregation here due to computational informational or organizational reasons a multi product reality is approximated by a model representation with fewer products we explore the aggregation error made when using an aggregate model in order to optimize a supply chain contract which is subsequently applied to a more detailed real system based on a numerical analysis it is shown that the design of supply chain contracts by means of an aggregate planning model may lead to significant suboptimalities

an approach for developing an optimal discount pricing policy this paper addresses the problem of why and how a seller should develop a discount pricing structure even if such a pricing structure does not alter ultimate demand the situation modeled is most appropriate where the seller s product does not represent a major component of the buyer s final product where the demand for the product is derived or where the price is only one of many factors considered in making a purchase decision a model of buyer reaction to any given pricing scheme is developed to show that there exists a unified pricing policy which motivates the buyer to increase its ordering quantity per order thereby reducing the joint buyer and seller ordering and holding costs as a result the seller is able to reduce its costs while leaving the buyer no worse off and often better off the model is extended to handle variable ordering and shipping costs and situations where the seller faces numerous groups of buyers each having different ordering policies finally a case study is presented explicitly showing how the proposed pricing policy can be applied to the situation of a large seller selling to a number of different buyer groups

a bargaining model with asymmetric information for a single supplier single buyer problem abstract banerjee s joint economic lot size jels model represents one approach to minimizing the joint total relevant cost of a buyer and a supplier by using a joint optimal order and production policy the implementation of a jointly optimal policy requires coordination and cooperation should the buyer have the market power to implement his own optimal policy as that one to be used in the exchange process no incentive exists for him to choose a joint optimal policy a joint policy can therefore only be the result of a bargaining process between the parties involved the supplier may make some sort of concession such as a price discount or a side payment in order to influence the buyer s order policy a critical assumption made throughout in supply chain literature is that the supplier has complete knowledge about the buyer s cost structure clearly this assumption will seldom be fulfilled in practice the research presented in this paper provides a bargaining model with asymmetric information about the buyer s cost structure assuming that the buyer has the power to impose its individual optimal policy

a quantity discount approach to supply chain coordination abstract quantity discounts provide a practical foundation for inventory coordination in supply chains however typical supply chain participants may encounter difficulties in implementing the coordination policy simply because 1 specified lot size adjustments may deviate from the economic lot sizes and 2 the buying firm may face amplified overstocking risks related to increased order quantities the main objective of this study is to develop a quantity discount model that resolves the practical challenges associated with implementing quantity discount policies for supply chain coordination between a supplier and a buyer the proposed buyer s risk adjustment b ra model allows the supplier to offer discounts that capitalize on the original economic lot sizes and share the buyer s risk of temporary overstocking under uncertain demand the analytical results suggest that the proposed b ra discount approach is a feasible alternative for supply chain coordination under uncertain demand conditions

note comments on a quantity discount pricing model to increase vendor profits monahan monahan j p 1984 a quantity discount pricing model to increase vendor profits management sci june 720 726 adapted the quantity discount model of inventory theory to the problem of determining an optimal quantity discount schedule from a vendor s point of view and opened up an important direction of research however his one item one customer one vendor model is based on several implicit assumptions that must be judged unreasonable monahan must account for the vendor s inventory carrying charges and redefine his variable s2 it is shown that a rational vendor s manufacturing frequency would not be identical to the buyer s ordering frequency if the vendor s manufacturing setup costs are substantially larger than the buyer s ordering costs a numerical example presented in this note also questions the practical usefulness of monahan s model even after its theoretical inaccuracies axe corrected monahan s model may explain discounts that are a fraction of 1 of the price of an item but it fails to explain commonly observed magnitudes of quantity discounts such as 10 of the unit price

multivariate granger causality between electricity consumption exports and gdp evidence from a panel of middle eastern countries this paper examines the causal relationship between electricity consumption exports and gross domestic product gdp for a panel of middle eastern countries we find that for the panel as a whole there are statistically significant feedback effects between these variables a 1 per cent increase in electricity consumption increases gdp by 0 04 per cent a 1 per cent increase in exports increases gdp by 0 17 per cent and a 1 per cent increase in gdp generates a 0 95 per cent increase in electricity consumption the policy implications are that for the panel as a whole these countries should invest in electricity infrastructure and step up electricity conservation policies to avoid a reduction in electricity consumption adversely affecting economic growth further policy implications are that for the panel as a whole promoting exports particularly non oil exports is a means to promote economic growth and that expansion of exports can be realized without having adverse effects on energy conservation policies

discount pricing decisions in distribution channels with price sensitive demand abstract in this paper we evaluate the effectiveness of quantity discounts and volume discounts as coordination mechanisms in distribution channels with demand that is price sensitive we consider a single vendor single retailer distribution channel demand for the product arises only at the retailer the demand faced by the retailer is assumed to be deterministic but price elastic the retailer in turn buys the product from the vendor the vendor and the retailer act independently and rationally each maximizing their own respective profit the equilibrium point that specifies the vendor s and buyer s inventory and pricing policy is determined by the solution to a stackelberg game we consider the cases when quantity discount and volume discount respectively are offered we develop methods to determine the optimal discount policy for these cases we then consider the case where both volume and quantity discounts are offered simultaneously and develop a method to determine the optimal simultaneous discount offer the relative performance of the alternative discount schemes is then evaluated through a numerical study the results of the study demonstrate that the effectiveness of volume discount as a coordination mechanism is higher when the sensitivity of demand to price changes is higher the effectiveness of quantity discount on the other hand is higher with lower price sensitivity of demand finally the results also demonstrate that perfect coordination is achieved when volume and quantity discounts are offered simultaneously

causality cointegration and control abstract the first sections of the paper show that causality tests can be relevant when considering the effectiveness of a control mechanism rejecting some results in earlier papers the relevance comes from a more careful consideration of what information is available to whom and when compared to previous work the final section of the paper extends this analysis to cointegrated variables when causality is a necessary consequence

energy and economic growth in the usa a multivariate approach abstract this paper examines the causal relationship between gdp and energy use for the period 1947 90 in the usa the relationship between energy use and economic growth has been examined by both biophysical and neoclassical economists in particular several studies have tested for the presence of a causal relationship in the granger sense between energy use and economic growth however these tests do not allow a direct test of the relative explanatory powers of the neoclassical and biophysical models a multivariate adaptation of the test vector autoregression var does allow such a test a var of gdp energy use capital stock and employment is estimated and granger tests for causal relationships between the variables are carried out although there is no evidence that gross energy use granger causes gdp a measure of final energy use adjusted for changing fuel composition does granger cause gdp

revisiting foundations in lot sizing connections between harris crowther monahan and clark abstract while many review articles exist on deterministic lot sizing models used in the context of price and quantity discounts buyer vendor coordination supply chain management and joint economic lot sizing problems they do not convey the impact of important findings which date back to at least 2002 or in hindsight to 1984 as a result many recent articles still model the financial implications of lot sizing decisions without having the assurance that these models would help the firm s involved in maximising the net present value npv this paper therefore reviews these findings while adding also its own contributions as to convey the general importance to lot sizing theory we show that the underlying principles used in the four key articles that have led to a division in modelling approaches are in fact all in line with npv and argue that therefore there should not be these discrepancies that currently persist in the literature we establish the connections between these four strands of the literature using the solution to a simple variation of harris eoq model deriving thereby results from boyaci and gallego 2002 and beullens and janssens 2011 but showing their general applicability to any type of supply chain structure the breath of implications to deterministic lot sizing theory is illustrated using practical examples we present a stochastic version of the model of crowther 1964 which is arguably the least understood and applied model but on the other hand the most important one in realising how these modelling strands can be unified

residential and non residential electricity dynamics abstract this paper uses u s panel data to instrument and examine the dynamics of electricity within the world market while separating between both residential and non residential electricity consumptions during the time period of 1990 2014 to better assess the true differences within each causal relationship all panel data has been separated into one full panel and three subpanels of high middle and low income the empirical framework used consists of various tests that identify the existence of cross sectional dependency a pesaran panel unit root test a westerlund panel cointegration test and the dumitrescu hurlin method of the granger causality test furthermore this paper utilizes dols to estimate any long run elastic relations between real gdp and residential or non residential electricity consumption based on the results this paper determines that no long run relationship exists between non residential electricity consumption and economic growth throughout and that the relationship between residential electricity consumption and economic growth possesses unit elastic behavior in the long run other findings throughout imply causality moves from economic growth in the direction of residential electricity consumption for all panels

electricity consumption growth nexus evidence from panel data for transition countries abstract this paper investigates the long run relationship and causality issues between electricity consumption and economic growth in 15 transition countries albania belarus bulgaria czech republic estonia latvia lithuania macedonia moldova poland romania russian federation serbia slovak republic and ukraine by using the pedroni panel cointegration method for the 1990 2006 period results suggest that the pedroni panel cointegration tests do not confirm a long term equilibrium relationship between electricity consumption per capita and real gdp per capita moreover since no cointegration was found error correction mechanisms plus causality tests cannot be run for further steps in the long term to investigate the causality between electricity consumption and economic growth overall it can be said that the electricity consumption related policies have no effect or relation on the level of real output in the long run for these countries as a conclusion the literature has conflicting results and there is no consensus either on the existence or the direction of causality between electricity consumption and economic growth thus the findings of this study have important policy implications and it shows that this issue still deserves further attention in future research

integrated vendor buyer cooperative inventory models with variant permissible delay in payments abstract the integrated inventory models usually have the advantage of reducing total cost however the way to allocate the cost savings from the integration to the buyer and vendor is critical to the success of the joint relationship between both sides to deal with this problem this paper develops the integrated models with the permissible delay in payments for determining the optimal replenishment time interval and replenishment frequency applying the models and considering the coefficient of negotiation and the maximum delay payment period a simple solution algorithm is presented to resolve the allocation of cost savings in the integration model the coefficient of negotiation is adopted to determine the compromise between the buyer s and vendor s cost savings a numerical example is used to demonstrate the feasibility of the proposed integration models a sensitivity analysis is also conducted to demonstrate some properties using the information from the proposed models the buyer and vendor can achieve an acceptable compromise solution for both sides in the supply chain management

models for multi plant coordination abstract this paper addresses coordination of production planning among multiple plants in a vertically integrated firm currently there is no unified body of literature that deals with this issue we identify important issues that managers and researchers must address so that production and inventory decisions can be determined for all plants in a manner optimal for the organization as a whole

review of energy growth nexus a panel analysis for ten eurasian oil exporting countries abstract the paper examines the energy growth nexus in ten oil exporting developing eurasian countries azerbaijan bahrain iran kazakhstan kuwait oman qatar russia saudi arabia and the uae over the period 1997 2014 lack of enough energy growth nexus studies on the oil exporters of the middle east and commonwealth of independent states coupled with a number of issues which have not been addressed by prior studies motivate us to conduct this review policymakers should take into consideration that any policy measures aimed at conserving the primary energy consumption can undermine economic growth as we find that the growth hypothesis dominates in the primary energy consumption growth nexus conversely validity of the neutrality hypothesis in the residential electricity consumption growth nexus another finding of this study implies that policymakers can pursue conservation policy by reconsidering the residential electricity subsidies in the selected countries the study contributes to the energy growth literature by addressing some issues and filling the gap for the eurasian oil exporting countries especially those in the middle east and commonwealth of independent states

modeling quantity discounts under general price sensitive demand functions optimal policies and relationships this paper presents models for determining optimal all unit and incremental quantity discount policies and investigates the effect of quantity discounts on increasing demand and ensuring pareto efficient transactions under general price sensitive demand functions the paper develops optimal quantity discount policies investigates their interrelationships and their benefits to both the supplier and the buyer and gains managerial insights for the scenarios of maximizing the supplier s profit and the joint profit we develop simple and efficient solution approaches for determining the all unit and the incremental optimal decision policies for general price sensitive demand functions we have three main findings first with price sensitive demand there are two incentives in offering quantity discounts increasing demand and ensuring pareto efficient transactions in most cases increasing demand dominates in justifying the offering of quantity discounts second using a single lot size associated with all efficient transactions as with the constant demand case does not hold with the price sensitive demand case third the optimal all unit quantity discount policy is equivalent to the optimal incremental quantity discount policy in benefiting both the supplier and the buyer

an exact policy for enhancing buyer supplier linkage in supply chain system abstract kim s l and ha d 2003 a jit lot splitting model for supply chain management enhancing buyer supplier linkage international journal of production economics 86 1 10 proposed a novel cooperative method for synchronizing supply with actual customer demand in a just in time scenario however all decision variables obtained using their model may not be integers making it difficult to be implemented in fixed cycle applications i e a planning horizon of one time period in addition their model can only be used to solve joint optimization for single buyer and single supplier furthermore problems arise when resource constraints are added to their model because traditional inventory models do not allow constraints to be added by the decision maker arbitrarily to improve the practical utility of the model of kim and ha 2003 we derive a mixed integer optimization approach which not only can be applied to the joint optimization for the multi buyer and single supplier but also all decision variables obtained are executable integers for the planning horizon of one time period to suit real world situations infinite planning horizon scenario is also considered in this study in addition illustrative examples are included to demonstrate the usefulness of the proposed models in which the integrated purchase policy being superior to independent optimization can be clearly seen moreover the analytical superiority of the proposed models in terms of execution time can be seen through a computational experiment conduced on a set of logical number of buyers in the multi buyer and single supplier problem finally the performance of various approaches i e proposed models and genetic algorithm is also examined to provide valuable insight into the practical problem

energy consumption and economic growth the case of oil exporting countries this paper examines the causal relationship between the per capita energy consumption and the per capita gdp in a panel of 11 selected oil exporting countries by using panel unit root tests and panel cointegration analysis the results show a unidirectional strong causality from economic growth to energy consumption for the oil exporting countries the findings have practical policy implications for decision makers in the area of macroeconomic planning in most major oil exporting countries government policies keep domestic prices bellow free market level resulting in high levels of domestic energy consumption the results imply that the energy conservation through reforming energy price policies has no damaging repercussions on economic growth for this group of countries

simultaneous determination of multiproduct batch and full truckload shipment schedules abstract a fundamental premise of the well known economic lot scheduling problem elsp is that the finished products are consumed at continuous rates i e their respective cycle inventories are depleted on the basis of unit transactions in today s supply chains however employing complex distribution networks finished goods inventories from manufacturing plants are usually shipped in bulk to succeeding stages along the distribution process moreover existing transport economies often tend to favor full truckload tl rather that partial or less than truckload ltl shipments for economical movement of such goods the scenario examined here however involves a set of products for which individual tl shipments are uneconomical as a remedy we construct a model for taking advantage of tl rates by combining ltl quantities of the items into a full load we adopt the common cycle approach for the elsp in conjunction with a common replenishment cycle as a coordination mechanism that is simple to analyze and implement this is integrated with a periodic full truckload shipping schedule such effective coordination of production and shipment schedules is likely to result in a more streamlined supply chain the concepts developed are illustrated through a simple numerical example

causal relationships between energy consumption foreign direct investment and economic growth fresh evidence from dynamic simultaneous equations models this paper examines the interrelationships between energy consumption foreign direct investment and economic growth using dynamic panel data models in simultaneous equations for a global panel consisting of 65 countries the time component of our dataset is 1990 2011 inclusive to make the panel data analysis more homogenous we also investigate this interrelationship for a number of sub panels which are constructed based on the income level of countries in this way we end up with three income panels namely high income middle income and low income panels in the empirical part we draw on the growth theory and augment the classical growth model which consists of capital stock labor force and inflation with foreign direct investment and energy generally we show mixed results about the interrelationship between energy consumption fdi and economic growth

electricity consumption and economic growth evidence from korea abstract this paper investigates the short and long run causality issues between electricity consumption and economic growth in korea by using the co integration and error correction models it employs annual data covering the period 1970 2002 the overall results show that there exists bi directional causality between electricity consumption and economic growth this means that an increase in electricity consumption directly affects economic growth and that economic growth also stimulates further electricity consumption

carbon emissions energy consumption and output a threshold analysis on the causal dynamics in emerging african economies abstract following the recent global economic downturn attention has gradually shifted towards emerging economies which have experienced robust growth amidst sluggish growth of the world economy a significant number of these emerging economies are in africa rising growth in these economies is associated with surging demand for energy to propel the engines of growth with direct implications on emissions into the atmosphere further these economies are constantly being shaped by series of structural reforms with direct and indirect effects on growth demand for energy etc to this end this paper examines the causal dynamics among energy use real gdp and co2 emissions in the presence of regime shifts in six emerging african economies using the gregory and hansen 1996a j econ 70 99 126 threshold cointegration and the toda and yamamoto 1995 j econometrics 66 225 250 granger causality techniques results confirm the presence of regime shift effects in the long run inter linkages among energy use real gdp and co2 emissions in the countries considered thus indicating that structural changes have both economic and environmental effects hence integration of energy and environmental policies into development plans is imperative towards attaining sustainable growth and development

a one vendor multi buyer integrated inventory model abstract we consider a one vendor multi buyer integrated inventory model the vendor seeks to minimize his total annual cost subject to the maximum costs which buyers are prepared to incur in order to implement this model the vendor only needs to know buyer s annual demand and previous order frequency which can be inferred from buyer s past ordering behavior we find the optimal solution for the one vendor one buyer case and present a heuristic approach for the one vendor multi buyer case

production lot sizing with work in process considerations in response to periodic demand abstract this paper develops two separate models for simultaneous determination of a product s manufacturing batch size and the order quantities of the input items that are used in the production process in response to periodic fixed purchase orders from a single customer the effects of work in process inventories resulting from a finite rate of production on the producer s cost function is explicitly taken into consideration in the model development process the first of these models assumes that all input items are procured lot for lot based on the production schedule of the output item this assumption is relaxed in the second model where multiple procurement lots for any input during a production cycle are allowed while an optimization procedure is outlined for solving the first model for the more generalized case an iterative heuristic solution algorithm is proposed due to the associated computational burden particularly for a large number of input items these concepts are illustrated through a numerical example

renewable energy consumption and economic growth evidence from a panel of oecd countries abstract this study examines the relationship between renewable energy consumption and economic growth for a panel of twenty oecd countries over the period 1985 2005 within a multivariate framework given the relatively short span of the time series data a panel cointegration and error correction model is employed to infer the causal relationship the heterogeneous panel cointegration test reveals a long run equilibrium relationship between real gdp renewable energy consumption real gross fixed capital formation and the labor force with the respective coefficients positive and statistically significant the granger causality results indicate bidirectional causality between renewable energy consumption and economic growth in both the short and long run

cross country disparity in agricultural productivity quantifying the role of modern seed adoption inequality of agricultural labour productivity across the developing world has increased substantially over the past 40 years this article asks to what extent did the diffusion of green revolution seed varieties contribute to increasing agricultural labour productivity disparity across the developing countries we find that 22 per cent of cross country variation in agricultural labour productivity can be attributed to the diffusion of high yielding seed varieties across countries and that the impact of such diffusion differed significantly across regions we discuss the implications of these findings for policy directed at increasing agricultural labour productivity in the developing world

adapting inventory models for handling various payment structures using net present value equivalence analysis beullens patrick univ southampton southampton so17 1bj hants england janssens gerrit k univ southampton southampton sch management southampton so17 1bj hants england janssens gerrit k hasselt univ res grp logist b 3590 diepenbeek belgium

lead time reduction strategies in a single vendor single buyer integrated inventory model with lot size dependent lead times and stochastic demand this paper studies alternative methods for reducing lead time and their impact on the safety stock and the expected total costs of a q s continuous review inventory control system we focus on a single vendor single buyer integrated inventory model with stochastic demand and variable lot size dependent lead time and assume that lead time consists of production and setup and transportation time as a consequence lead time may be reduced by crashing setup and transportation time by increasing the production rate or by reducing the lot size we illustrate the benefits of reducing lead time in numerical examples and show that lead time reduction is especially beneficial in case of high demand uncertainty further our studies indicate that a mixture of setup time and production time reduction is appropriate to lower expected total costs

co integration and causality testing of the energy gdp relationship a cross country study in this paper the energy gdp relationship in per capita terms is analysed for a sample of 16 countries over the time period 1950 51 to 1984 85 co integration theory is first used to test whether a long run equilibrium relation exists between the two variables after co integration has been established causality measures are constructed to quantify various types of feedback between energy and gdp for each country it is then examined whether the causality measures are longitudinally related to certain basic economic indicators of the countries in the sample

structural break unit root and the causality between energy consumption and gdp in turkey abstract this paper tries to investigate a series of unit root and causality tests to detect causality between the gdp and energy consumption in turkey employing hsiao s version of granger causality method for the 1950 2000 period the conventional unit root tests indicate the series are i 1 whereas the endogenous break unit root tests proposed by zivot and andrews zivot e and andrews d w k 1992 further evidence on the great crash the oil price shock and the unit root hypothesis journal of business and economics statistics 10 251 270 and perron perron p 1997 further evidence on breaking trend functions in macroeconomic variables journal of econometrics 80 355 385 reveal that the series are trend stationary with a structural break therefore it is inappropriate to take the first difference of the data to achieve stationarity the main conclusion of this study is that there is no evidence of causality between energy consumption and gdp in turkey based on the detrended data

supplier pricing and lot sizing when demand is price sensitive abstract the problem of co ordination between a vendor and a buyer is formulated as a two person fixed threat bargaining game the vendor decides on his lot size and the price schedule he is to offer to the buyer the buyer decides upon his lot size and the selling price in the market we have characterized pareto efficient solutions and the nash bargaining solution for the problem we have also proposed two pricing schedules for the vendor who is supplying to a large population of buyers the first one is based upon profit sharing the second one resembles the classical all unit quantity discount schedule we have thus provided for the supplier a procedure for setting all unit quantity discount schedule

energy consumption and output evidence from a panel of 14 oil exporting countries abstract we examine the long run relation and short run dynamics between energy consumption and output in a panel of 14 oil exporting countries over 1980 2007 panel unit root tests which account for common cross sectional factors fail to reject non stationarity in both variables thus we explore their long run relation and short run dynamics using three alternative panel estimation techniques dynamic fixed effect pooled and mean group estimators before and after accounting for common cross sectional factors these estimators allow for various degrees of heterogeneity in long run parameters and short run dynamics the results based on the mean group estimator with common correlated effects suggest a a stable relation between energy consumption and output b bi directional causality in both long and short run and c the robustness of the long run causality results to the inclusion of additional variables as such environmental policies designed to curtail energy may have significant long run ramifications for economic growth and policies designed to promote economic growth may have adverse environmental consequences

a literature survey on energy growth nexus abstract this paper provides a survey of the recent progress in the literature of energy consumption economic growth and electricity consumption economic growth causality nexus the survey highlights that most empirical studies focus on either testing the role of energy electricity in stimulating economic growth or examining the direction of causality between these two variables although the positive role of energy on growth has become a stylized fact there are some methodological reservations about the results from these empirical studies a general observation from these studies is that the literature produced conflicting results and there is no consensus neither on the existence nor on the direction of causality between energy consumption electricity consumption and economic growth as a policy implication to avoid from conflicting and unreliable results the authors may use the autoregressive distributed lags bounds test two regime threshold co integration models panel data approach and multivariate models including new variables such as real gross fixed capital formation labor force carbon dioxide emissions population exchange rates interest rates etc thus the authors should focus more on the new approaches and perspectives rather than by employing usual methods based on a set of common variables for different countries and different intervals of time

market based supply chain coordination by matching suppliers cost structures with buyers order profiles we study competitive marketplaces with multiple suppliers and multiple buyers dealing with a single product a buyer chooses the supplier who offers the best price for his order profile as described by his order size and delivery frequency a supplier s offering price reflects her logistic cost structure as captured by relevant economies of scale in a setup cost component and storage and distribution related costs in a holding cost per unit component we argue that the matching of buyers order profiles to suppliers cost structures is the main source of supply chain coordination benefit in this many to many supply chain such cost effective matching can be achieved naturally through price competition among suppliers we identify the segment of the buyer s order space that each supplier can win and perform market share sensitivity analysis when a supplier s cost structure changes the winning supplier at the equilibrium of price competition offers the lowest price of her closest competitor inste