the expected inflation channel of government spending in the postwar u s abstract there exist sticky price models in which the output response to a government spending change can be large if the central bank is nonresponsive to inflation according to this expected inflation channel government spending drives up expected inflation which in turn reduces the real interest rate and leads to an increase in private consumption this paper examines whether the channel was important in the post wwii u s with particular attention to the 2009 recovery act period first we show that a model calibrated to have a large output multiplier requires a large response of expected inflation to a government spending shock next we show that this large response is inconsistent with structural vector autoregression evidence from the federal reserve s passive policy period 1959 1979 then we study expected inflation measures during the recovery act period in conjunction with a panel of professional forecaster surveys a cross country comparison of bond yields and fiscal policy news announcements we show that the expected inflation response was too small to engender a large output multiplier

new technology based firms and the creation of regional growth potential this paper focuses on the role of new technology based firms ntbfs as a vital determinant of regional growth potential the theoretical framework starts from the relation between innovation and economic development macro approach to show how ntbfs can contribute to the creation of a regional growth potential micro approach empirical data for belgium illustrate how ntbfs differ significantly from common starters on a number of fundamental characteristics such as educational level product market orientation socio economic networking delegation growth strategy and research and development taking these findings into account we concentrate on the region specific technology policies in belgium the case of the emerging biotechnology industry is used as an illustration

joint pricing and ordering policy for two echelon imperfect production inventory model with two cycles abstract this study deals with an imperfect epq economic production quantity price dependent inventory model over two types of cycles in the first cycle the retailer sells only good product with actual price and in the second he sells the products with a discount price in the production run time the non conforming items are produced at a random rate and they are reworked after the regular production run time and the reworked items are almost perfect as good as original quality items the retailer starts the second cycle when a certain percent of good items are left to him after the completion of regular production the retailer continues simultaneously two cycles up to which both types of the products are available to him now our objective is to find out optimal ordering lot size and optimal price for which the profit of the integrated model is maximum also we check the best strategy of retailer for the time of starting second cycle a numerical example is provided to illustrate the behavior and application of the model

nonseparable preferences frisch labor supply and the consumption multiplier of government spending one solution to a fiscal policy puzzle this paper proposes a theoretical explanation of the positive consumption multipliers of government spending often found in the data the explanation requires two ingredients first labor demand expands e g prices are sticky second general nonseparable preferences over consumption and leisure should be such that the two goods are substitutes that is frisch labor supply elasticity is lower than the constant consumption elasticity this implies that constant consumption labor supply shifts left existing empirical evidence on the relative magnitudes of the two elasticities supports this hypothesis the parametric conditions under which the result occurs are consistent with restrictions of concavity and noninferiority of consumption and leisure

persistent government spending and fiscal multipliers the investment channel this paper inspects the mechanism shaping government spending multipliers in various smallscale dsge setups with endogenous labor supply and capital accumulation we analytically characterize the short run investment multiplier which in equilibrium can be either positive or negative the investment multiplier increases with the persistence of the exogenous government spending process the response of investment to government spending shocks strongly affects short run multipliers on output and consumption

economic order quantity models for imperfect items with buy and repair options abstract one of the celebrated extensions of the economic order production quantity eoq epq model is one that assumes a received shipment contains a fraction of imperfect non conforming quality items where these items detected by 100 screening are sold as a single batch at a discounted price this paper revisits this model salameh and jaber 2000 int j prod econ 64 1 59 64 and extends it by assuming that a shipment is coming from a distant supplier and therefore it is not feasible to replace the imperfect items with an additional order to the same supplier to address this restriction two models are presented the first assumes that imperfect items are sent to a repair shop who charges a cost plus a markup margin while the second model assumes that imperfect items are replaced by good ones from a local supplier at a higher cost the inventory environment assumed in this paper is relevant in todays globalised supply chains thus practical implications of the problem faced are discussed numerical results are also presented and discussed the results show that there exists a threshold value of the unit purchase cost of an emergency ordered item and a fraction of defectives to which it is decided to either buy or repair

employment generation potential of new technology based firms during a recessionary period the case of finland this article analyzes the employment generation potential of new technology based firms during a recessionary period the empirical data is from finland a country that was hit particularly hard by the economic recession between years 1990 and 1993 in spite of the recession the number of ntbfs new technology based firms rose by 17 from 1986 to 1993 in traditional manufacturing industry branches the overall employment fell by as much as 33 during the same period alternative hypotheses to explain the increase in the importance of ntbfs are presented and discussed in the light of research findings both flexible specialization and recession push hypotheses receive support in the empirical data

note on economic production quantity model for items with imperfect quality a practical approach abstract in this note we present a simple approach for determining the economic production quantity for an item with imperfect quality we compare the results based on the simple approach with the optimal method for determining the lot size and show that almost optimal results are obtained using the simple approach

optimal production lot with imperfect production process under permissible delay in payments and complete backlogging abstract the traditional economic production quantity epq model assumes that the production products are all perfect it is not always true in the real production system due to imperfect production process or other factors imperfect quality items may be produced furthermore it is well known that the total production inventory costs can be reduced by reworking the imperfect quality items produced with a relatively smaller additional reworking and holding costs in addition the permissible delay in payments offered by the supplier is widely adopted in the practical business market in this study we explore the effects of the reworking imperfect quality items and trade credit on the epq model with imperfect production processes and complete backlogging a mathematical model which includes the reworking and shortage costs interest earned and interest charged is presented besides an arithmetic geometric mean inequality approach is employed and an algorithm is developed to find the optimal production policy furthermore some numerical examples and sensitivity analysis are provided to demonstrate the proposed model

optimal fiscal and monetary policy with occasionally binding zero bound constraints abstract this paper studies optimal fiscal and monetary policy when the nominal interest rate is subject to the zero lower bound zlb constraint in a stochastic new keynesian economy in the baseline model calibrated to match key features of the u s economy it is optimal for the government to increase its spending when at the zlb in the stochastic environment by about 60 percent more than it would in the deterministic environment the presence of uncertainty creates a unique time consistency problem if the steady state is inefficient although access to government spending policy increases welfare in the face of a large deflationary shock it decreases welfare during normal times as the government reduces the nominal interest rate less aggressively before reaching the zlb

sophisticated monetary policies in standard monetary policy approaches interest rate rules often produce indeterminacy a sophisticated policy approach does not sophisticated policies depend on the history of private actions government policies and exogenous events and can differ on and off the equilibrium path they can uniquely implement any desired competitive equilibrium when interest rates are used along the equilibrium path implementation requires regime switching these results are robust to imperfect information our results imply that the taylor principle is neither necessary nor sufficient for unique implementation they also provide a direction for empirical work on monetary policy rules and determinacy

a multi item fuzzy economic production quantity problem with a finite production rate abstract inventory management and production planning are essential tasks for every company in the industry therefore the development of a large set of economic order quantity eoq models is needed in this paper a fuzzy multi item economic production quantity epq model is developed this paper contributes to the state of the art with a theoretical study of a problem where a company has to decide the size of some production batches under uncertain cycle times the uncertainty will be handled with triangular fuzzy numbers and an analytical solution will be found to the optimization problem

patenting in the shadow of competitors this article empirically examines the patenting behavior of new biotechnology firms that have different litigation costs i show that firms with high litigation costs are less likely to patent in subclasses with many other awards particularly those of firms with low litigation costs this pattern is consistent with the literature on costly litigation which suggests that firms that have high litigation costs will take greater precautions to avoid litigation these results are robust to a variety of control variables and modifications that seek to test alternative explanations

efficient inventory control for imperfect quality items in this paper we present a general eoq model for items that are subject to inspection for imperfect quality each lot that is delivered to the sorting facility undertakes a 100 per cent screening and the percentage of defective items per lot reduces according to a learning curve the generality of the model is viewed as important both from an academic and practitioner perspective the mathematical formulation considers arbitrary functions of time that allow the decision maker to assess the consequences of a diverse range of strategies by employing a single inventory model a rigorous methodology is utilised to show that the solution is a unique and global optimal and a general step by step solution procedure is presented for continuous intra cycle periodic review applications the value of the temperature history and flow time through the supply chain is also used to determine an efficient policy furthermore coordination mechanisms that may affect the supplier and the retailer are explored to improve inventory control at both echelons the paper provides illustrative examples that demonstrate the application of the theoretical model in different settings and lead to the generation of interesting managerial insights

eoq models for a coordinated two level international supply chain considering imperfect items and environmental impact abstract for a two level supply chain models are presented to determine the optimal production shipment policy for items with imperfect quality in three different scenarios a both the vendor and the buyer are in the same country b the vendor and the buyer are in different countries where the stochastic behavior of the exchange rate between the two countries is modeled using a mean reverting process and c environmental impact is incorporated in determining the optimal production shipment policy by taking into account the fixed and variable carbon emission costs the objective is to minimize the total expected cost per unit time for each scenario considering equal shipment size the total expected cost per unit time is derived and the solution procedure is proposed numerical examples are presented and the results are discussed

investment ramifications of distortionary tax subsidies abstract this paper examines the investment effects of tax subsidies for which some assets and not others are eligible distortionary tax subsidies concentrate investments in tax favored assets thereby reducing the expected pre tax profitability of investment and reducing payoffs to bondholders in the event of default anticipation of asset substitution encourages lenders to require covenants in debt contracts which only imperfectly address asset substitution and distort investment the result is that borrowing is made more expensive which in turn discourages investment borrowing rates can react so strongly that aggregate investment may rise very little or even fall in response to higher tax subsidies debt issued by u s firms in risk of default after the 2002 introduction of bonus depreciation for u s equipment investment contained many more covenants than in other periods a pattern that reversed when bonus depreciation was discontinued after 2004 furthermore firms at risk of default borrowed less and were more apt to lease capital than were other firms during the bonus depreciation period

the optimal composition of public spending in a deep recession abstract we study optimal fiscal policy in an economy plunged into a deep recession characterized by a liquidity trap and in which the government can allocate spending both to consumption and investment goods public investment increases the stock of public capital subject to a time to build constraint the zero lower bound on the nominal interest rate binds as a result of a large shock that increases households desire to save in the risk free asset pushing the natural rate of interest below zero under nominal rigidities and sub optimal monetary policy the shock leads to a large decline in private consumption and investment we show that the optimal response to such a shock is to temporarily raise public spending above the level that would be dictated by classical principles and to tilt its composition towards public investment this compositional shift lasts well after the natural rate has ceased to be negative our results suggest that the american recovery and reinvestment act of 2009 was insufficiently oriented towards public investment

the composition of government spending and the multiplier at the zero lower bound we investigate the size of the multiplier at the zlb in a new keynesian model it ranges from around 0 25 to 1 5 depending on the extent to which the government spending is productive substitutable or not for private consumption

employment change in independent owner managed high technology firms in great britain there is a growing volume of literature that points to the potential for small technology based firms to achieve substantial employment growth as a direct consequence of such work this sector of any economy has attracted increasing attention from national and local governments concerned with finding ways of revitalising economically deprived localities and creating employment opportunities this paper provides up to date empirical evidence surrounding the ability of small high technology firms to create additional jobs in great britain in addition key founder and business characteristics are isolated which are significantly associated with employment change in growing high technology firms over the 1986 to 1992 period with respect to factors influencing these high levels of employment growth a high firm size in 1986 was found to act positively on employment growth as was a graduate level education for the key founder on the finance side firms which had access to and used a multiplicity of sources of start up finance tended to grow faster futher on the basis of our results we would suggest and recommend a government policy which at the firm level actively encourages high technology firm start ups who record higher rates of survival than firms in more conventional sectors as well as providing support for existing high technology firms who have already demonstrated the inclination and ability to grow in employment size

an eoq model with random variations in demand this paper presents a model that incorporates variations in the demand rate at random time points into the inventory planning decision these changes in demand may occur due to economic recessions labor strife starting or ending or other events that result in a period of time during which the rate of demand is shifted up or down from its current level the paper uses system point level crossing theory to derive expressions for the distribution and expected value of on hand inventory ordering rate and the expected total cost rate for a given ordering policy a sensitivity analysis is conducted and a number of qualitative properties are provided to illustrate the use of the results to obtain optimal order quantities

an economic order quantity model with defective items and shortages abstract the fundamental assumption of an economic order quantity eoq model is that 100 of items in an ordered lot are perfect this assumption is not always pertinent for production processes because of process deterioration or other factors this paper develops an eoq model for that each ordered lot contains some defective items and shortages backordered it is assumed that 100 of each lot are screened to separate good and defective items which are collection of imperfect quality and scrap items the effect of percentage defective on optimal solution is studied while numerical examples are provided for the developed model

occbin a toolkit for solving dynamic models with occasionally binding constraints easily abstract the toolkit adapts a first order perturbation approach and applies it in a piecewise fashion to solve dynamic models with occasionally binding constraints our examples include a real business cycle model with a constraint on the level of investment and a new keynesian model subject to the zero lower bound on nominal interest rates compared with a high quality numerical solution the piecewise linear perturbation method can adequately capture key properties of the models we consider a key advantage of the piecewise linear perturbation method is its applicability to models with a large number of state variables

an eoq model with imperfect quality items inspection errors shortage backordering and sales returns abstract in practice the items received in a lot may contain defective items and the screening process to eliminate the defective items may involve both a type i and a type ii error due to the defective items and the inspection errors shortages may sometimes occur in this paper we develop an economic order quantity model with imperfect quality items inspection errors shortage backordering and sales returns a closed form solution is obtained for the optimal order size the maximum shortage level and the optimal order reorder point if shortages are not allowed we adopt the order overlapping scheme proposed by maddah et al 2010 computers and industrial engineering 58 4 691 695 to develop an eoq model to prevent shortages during the screening process numerical examples show the impacts of the defective probability the inspection errors and the holding and backordering costs on the optimal solution

disaggregation and consolidation of imperfect quality shipments in an extended epq model abstract we consider a standard economic production quantity epq model due to manufacturing variability a fraction p of the produced inventory will have imperfect quality where p is a random variable with a known distribution we consider a 100 inspection policy and further assume that the inspection rate is larger than that of production thus all imperfect quality items will be detected by the end of the production cycle for such an augmented epq model we first derive the new optimal production quantity assuming that the imperfect quality items are salvaged once at the end of every production cycle then we extend this base model to allow for disaggregating the shipments of imperfect quality items during a single production run finally we consider aggregating or consolidating the shipments of imperfect items over multiple production runs under both scenarios we derive closed form expressions for both the economic production quantity and the batching policy and show that our desegregation consolidation schemes can lead to significant cost savings over the base model

eoq with a correlated binomial supply abstract this paper considers a variant of the economic order quantity eoq model under random supply a binomial supply model is adopted where every item received is of imperfect quality with the same probability we study the realistic case where the qualities of items in an order are correlated and draw useful insights the most interesting of which is that correlation decreases the order size several practical correlation patterns are investigated and discussed we also show that several commonly used models in the literature can be represented by an equivalent correlated binomial supply model

optimal lot sizing integration policy under learning and rework effects in a manufacturer retailer chain abstract most research in economic manufacturing order quantity management assumes that all products are of perfect quality and are produced at a constant production rate one result of this assumption is that the number of units produced in a given period is constant which is not the case in real life most production systems produce items which are of perfect quality along with some that are of imperfect quality defective items as well as the learning effect affect production and inventory costs thereby shaping the performance of the manufacturer retailer chain the present study uses the nash stackelberg and cooperation games to model an imperfect production system to investigate the combined effects of lot sizing size integration the learning effect imperfect production and the rework process on a manufacturer retailer channel this study also demonstrates the optimal properties of the proposed models develops a search algorithm for obtaining optimal solutions and conducts a numerical study to seek structural and quantitative insights into the structure of the proposed models in addition it analyzes the sensitivity of the solutions in relation to the major parameters

epq models with varying setup cost abstract in this paper the classical economic production quantity epq model is generalized by considering a relationship between the setup cost and the production run length the dependency between the setup cost and run length can be related to process deterioration and learning and forgetting effects two models are developed the first of which is for the case when shortages are not allowed and the other one permits shortages the cost functions associated with these models are proved to be convex and optimal solutions are determined results show that the relationship between setup cost and production run length has a significant impact on the optimal lot size and average total cost in the epq model numerical examples are presented to demonstrate the utility of the models

the government spending multiplier in a mis managed liquidity trap i study the impact of a government spending shock in a new keynesian model when monetary policy is set optimally in this framework the economy is at the zero lower bound but expectations are well managed by the central bank as such the multiplier effect of government spending increases on expected inflation is small while the one on output can be larger than one this is consistent with recent empirical evidence on the effects of the 2009 arra

some fiscal calculus what is the impact of fiscal policy on the econ omy how large are the multipliers of govern ment spending and tax cuts this old question has recently received considerable attention in par ticular in the context of the american recovery and reinvestment act arra of 2009 i contribute to answering that question by calculating fiscal multipliers in a baseline neo classical growth model with endogenous labor supply and fiscal policy allowing for govern ment spending transfers government debt and distortionary taxes on labor and capital income the policy experiments are conducted holding transfers consumption taxes and capital income taxes fixed i e changes in taxation require changes in the distortionary labor tax the model is simple and fairly standard as an additional contribution i provide the model in an elegant and tractable form starting from a fairly general formulation and pointing out the key functional form properties for characterizing the dynamics the formulation of the model here or versions

optimal monetary and fiscal policy with a zero bound on nominal interest rates i characterize optimal monetary and fiscal policy in a stochastic new keynesian model when nominal interest rates may occasionally hit the zero lower bound the benevolent policymaker controls the short term nominal interest rate and the level of government spending under discretionary policy accounting for fiscal stabilization policy eliminates to a large extent the welfare losses associated with the presence of the zero bound under commitment the gains associated with the use of the fiscal policy tool remain modest even though fiscal stabilization policy is part of the optimal policy mix

monetary and fiscal policy in a liquidity trap with inflation persistence abstract this paper relies on the new keynesian model with structural inflation persistence to characterize the optimal monetary and fiscal policy in a liquidity trap it shows that with a phillips curve that is both forward and backward looking the monetary policy that is implemented during a liquidity trap episode can be sufficient to avoid a depression the central bank does not need to commit beyond the end of the crisis to get some traction on economic activity regarding fiscal policy inflation persistence justifies some front loading of government expenditures to get inflation started such as to reduce the real interest rate the magnitude of the optimal fiscal stimulus is decreasing in the degree of inflation persistence finally if inflation persistence is due to adaptive expectations rather than to price indexation then monetary policy is ineffective while the optimal fiscal stimulus is large and heavily front loaded

the costs of inefficient bargaining and financial distress abstract this study provides the first large sample analysis of the stock market reactions to interfirm litigation when a suit is filed the common stock of the typical defendant declines by about 1 while the plaintiff experiences no significant gains for the average pair of firms the combined drop in value upon filing is 21 million much of the loss is regained if the suit is settled the findings suggest that bargaining among firm claimants sometimes leads to very inefficient outcomes part of the leakage is explained by the costs of increased financial distress imposed on the defendant

a reexamination of the empirical relationship between investment and financing decisions several studies see 7 15 9 and 16 have attempted to ascertain the empirical relationships that exist between the financing and investment decisions of firms the primary impetus for these efforts was provided by modigliani and miller mm 20 21 when they demonstrated that under the assumption of perfect capital markets the optimal investment decisions of a firm are separable from its financing decisions in the presence of market imperfections interdependencies between these decisions that violate the basic mm propositions may exist therefore the studies referred to above have essentially focused upon determining whether market imperfections have been of sufficient magnitude to lead to joint determination of investment and financing decisions though the original mm propositions were introduced more than two decades ago the nature of the empirical relationship between investment and financing decisions remains a controversial issue the fact that this matter is still unresolved is not attributable to a lack of attention for the original propositions have been examined in the presence of taxes bankruptcy costs and agency costs with no clear consensus emerging

optimal monetary policy under commitment with a zero bound on nominal interest rates we determine optimal monetary policy under commitment in a forwardlooking new keynesian model when nominal interest rates are bounded below by zero the lower bound represents an occasionally binding constraint that causes the model and optimal policy to be nonlinear a calibration to the u s economy suggests that policy should reduce nominal interest rates more aggressively than suggested by a model without lower bound rational agents anticipate the possibility of reaching the lower bound in the future and this amplifies the effects of adverse shocks well before the bound is reached while the empirical magnitude of u s mark up shocks seems too small to entail zero nominal interest rates shocks affecting the natural real interest rate plausibly lead to a binding lower bound under optimal policy however this occurs quite infrequently and does not imply positive average inflation rates in equilibrium interestingly the presence of binding real rate shocks alters the policy response to non binding markup shocks

the effect of stock for debt swaps on bank holding companies abstract twenty two of the numerous stock for debt swaps that have taken place since august 1981 have been by bank holding companies although the most oft quoted reason for making the swap is its positive effect on reported earnings we argue that the effects of the bankruptcy tax act of 1980 on the tax treatment of early retirement of discount debt often makes stock for debt swaps a preferable alternative to cash repurchases of discount debt for sinking fund obligations furthermore for bank holding companies the swaps allow them to adjust their capital positions to new optimal levels ad dictated by the more stringent capital standards promulgated by the regulatory authorities in 1981 for 99 non banking firms we found a significant and negative abnormal average return on the swap announcement date of 0 49 percent for the 22 bank holding companies however we found no significant abnormal average return on the announcement date of the swaps the results suggest that swaps may be reducing the potential costs of regulatory interference for bank holding companies if they are overlevered which offsets whatever other force is driving down stock prices on new issue announcement dates

fiscal policy in an expectations driven liquidity trap we study the effects of fiscal policy interventions in a liquidity trap in a model with nominal rigidities and an interest rate rule in a liquidity trap caused by a self fulfilling state of low confidence higher government spending has deflationary effects that reduce the spending multiplier when the zero lower bound is binding instead cuts in marginal labor tax rates are inflationary and become more expansionary when the zero lower bound is binding these findings contradict popular views about the effects of fiscal policy in a liquidity trap

supply chain contract design under financial constraints and bankruptcy costs we study contract design and coordination of a supply chain with one supplier and one retailer both of which are capital constrained and in need of short term financing for their operations competitively priced bank loans are available and the failure of loan repayment leads to bankruptcy where default costs may include variable proportional to the firm s sales and fixed costs without default costs it is known that simple contracts e g revenue sharing buyback and quantity discount can coordinate and allocate profits arbitrarily in the chain with only variable default costs buyback contracts remain coordinating and equivalent to revenue sharing contracts but are pareto dominated by revenue sharing contracts when fixed default costs are present thus for general bankruptcy costs contracts without buyback terms are of most interest quantity discount contracts fail to coordinate the supply chain since a necessary condition for coordination is to proportionally reallocate debt obligations w

an optimal policy for a single vendor single buyer integrated production inventory problem with process unreliability consideration abstract this article develops a model to determine an optimal integrated vendor buyer inventory policy for flawed items in a just in time manufacturing environment the objective is to minimize the total joint annual costs incurred by the vendor and the buyer the production process is assumed to deteriorate during processing and produces a certain number of defective items for practical purpose the article is concerned with the policy in which the delivery quantity to the buyer is identical at each replenishment the expected annual integrated total cost function is derived and a solution procedure is established to find out the optimal solution finally the solution technique is illustrated with a numerical example available in the literature

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

lot sizing with a markov production process and imperfect items scrapped abstract this paper considers an inventory system within the economic order quantity eoq model framework under random supply the production process can go out of control with a constant probability and start producing imperfect quality items such a system has been studied in the literature under the assumption that defective items are reworked instantaneously and returned to inventory in some situations imperfect quality items are not necessarily defective and are removed from the inventory to be used elsewhere this paper develops two models where imperfect items are removed from inventory the first model finds the expected cost and optimal lot size assuming that imperfect quality items are removed from inventory at no cost the second model assumes that batches of imperfect quality are consolidated and shipped together due to economies of scale in shipping analytical and numerical results are developed for both models revealing several managerial insights

an imperfect production process in a volume flexible inventory model abstract this paper hypothesizes an imperfect production inventory system where the items produced are a mixture of perfect and imperfect quality some of the imperfect quality items can be sold at a reduced selling price the unit production cost is taken to be a function of the finite production rate which is treated as a decision variable the mathematical expression for the expected profit function is derived and it is maximized subject to different constraints of the system using interior penalty function method for constrained optimization the algorithm of which is given the solution procedure is illustrated with the help of numerical examples the sensitivity of each variable to changes in the values of the parameters of the system is examined lastly various issues conforming the system are discussed

an integrated production inventory model with imperfect production processes and weibull distribution deterioration under inflation abstract this study develops an integrated production and inventory model from the perspectives of both the manufacturer and the retailer the model assumes a varying rate of deterioration partial backordering inflation imperfect production processes and multiple deliveries the elapsed time until the production process shift is assumed to be arbitrarily distributed the discounted cash flow and classical optimization technique are used to derive the optimal solution a numerical example including the sensitivity analysis is given to validate the results of the production inventory model the integrated decision results in lower optimal joint cost compared with an independent decision by the manufacturer and the retailer

firm size and optimal growth rates abstract this paper presents a theoretical model in which due to dissolution costs the rate of growth of small firms tends to be higher and more variable than that of larger firms this model also predicts that for large firms the rate of growth is fixed as claimed by gibrat s law

the economic order quantity model revisited an extended exergy accounting approach abstract the economic order quantity eoq model has been popular among academicians and practitioners for decades despite the many variants of the eoq that have appeared in the literature to fine tune it to reality it still has limitations a major one is that it does not take into account the hidden costs inherent in inventory systems some of these costs relate to sustainability issues including environmental social labor and economic effects this paper considers some of these costs referred to as the exergetic costs and estimates them using the extended exergy accounting eea approach extended exergy accounting assigns equivalent exergetic values to capital labor and environmental remediation costs of a system the analysis combines the classical exergy analysis with the sustainability factors which are the labor capital and environment the paper uses an exergetic model to determine the eoq inventory policies for three firms operating in the usa germany and china the results show that the eoq is different for the three firms because the equivalent exergy of capital labor and environment remediation costs is different in each country

an eoq model with backorders and rejection of defective supply batches abstract we consider a single echelon inventory installation under the classical eoq with backorders paradigm to study the effects of supply quality on cost performance previous research on imperfect supply quality has focused on variants of the proportional deterministic or random yield problem where supply batches are all accepted and then used after screening any defects in this paper we study an alternative setting where entire supply batches may be defective below quality standards and therefore rejected on arrival note that such supply flow disruptions are analogous to those considered within the economic order quantity with disruptions eoqd area of research we first present an exact model for the system expected cost and show its convexity optimal cost and respective values of the decision variables i e planned order quantity and backorders are then obtained in a closed form interestingly under perfect supply quality all expressions reduce to those of classical eoq analytical and computational results reveal the serious impact of inferior supply quality on system cost as well as the sensitivity of the system parameters

optimal vendor investment for reducing defect rate in a vendor buyer integrated system with imperfect production process this paper investigates a single vendor single buyer integrated production inventory model with stochastic demand and imperfect production process it is assumed that there is an inspection activity on the part of the buyer with a fixed screening rate greater than the demand rate the vendor invests money in order to improve the production process quality and reduce the number of defectives the expected annual integrated total cost is derived under the n shipment policy and an iterative procedure is suggested to determine the optimal decisions the benefit of investment in reducing the defect rate is illustrated by way of numerical examples it is observed that the higher the defect rate the more beneficial the investment numerical studies further explore that an increased demand requires an increased investment to optimize the total cost

optimal monetary policy at the zero interest rate bound what should a central bank do when faced with a weak aggregate demand even after reducing the short term nominal interest rate to zero to address this question we solve a central bank s intertemporal loss minimization problem in which the non negativity constraint on nominal interest rates is explicitly considered we find that the optimal path is characterized by policy inertia in the sense that a zero interest rate policy should be continued for a while even after the natural rate of interest returns to a positive level by making such a commitment the central bank is able to achieve higher expected inflation lower long term nominal interest rates and a weaker domestic currency in the adverse periods when the natural rate of interest significantly deviates from a steady state level

economic production quantity model for items with imperfect quality abstract the assumptions necessary to justify the use of economic production quantity epq eoq models are rarely met to provide mathematical models that more closely conform to actual inventories and respond to the factors that contribute to inventory costs the models must be extended or altered this paper hypothesizes a production inventory situation where items received or produced are not of perfect quality items of imperfect quality not necessarily defective could be used in another production inventory situation that is less restrictive process and acceptance control the electronics industry gives good examples of such situations this paper extends the traditional epq eoq model by accounting for imperfect quality items when using the epq eoq formulae this paper also considers the issue that poor quality items are sold as a single batch by the end of the 100 screening process a mathematical model is developed and numerical examples are provided to illustrate the solution procedure

the administrative costs of corporate bankruptcy a note in this paper we present evidence on the direct administrative costs of corporate bankruptcy the investigation is directed toward providing evidence that may be helpful in answering questions about the role of bankruptcy costs as a determinant of corporate capital structures the importance of bankruptcy costs as a determinant of corporate financing policy has been extensively debated in the finance literature the origins of the debate can be traced to modigliani and miller 8 and robichek and myers 9 under the assumption that debt is default free and interest payments are taxdeductible modigliani and miller demonstrated that firms will maximize their market values by maximizing their use of debt financing robichek and myers demonstrated that this conclusion also holds when debt is not default free but bankruptcy is costless to explain observed corporate debt to total value ratios which typically fall in the range of 20 percent to 30 percent robichek and myers 9 and baxter 1 appealed to the existence of bankruptcy costs as a possible counterweight to the tax deductibility of interest payments subsequently kraus and litzenberger 5 scott 10 lee and barker 6 kim 4 and turnbull 13 developed formal models in which firms maximize value by increasing their use of debt financing to the point where the marginal present value of future tax shields equals the marginal present value of future bankruptcy costs the bankruptcy cost literature has identified three types of costs as potentially relevant to the determination of a firm s optimal mix of debt and equity financing 1 the direct administrative expenses paid to various third parties involved in the bankruptcy proceedings 2 the shortfall in realized value when assets are sold in liquidation or the indirect costs of reorganization and 3 the loss of tax credits which the firm would have received had it not gone bankrupt contrarily haugen and senbet 3 and to a lesser extent miller 7 and warner 14 have argued that the only bankruptcy costs relevant to the determination of a firm s optimal capital structure are the direct administrative costs of bankruptcy the crux of their argument is that the shortfall costs of liquidation the indirect costs of reorganization and the loss of tax credits which occurs upon dissolution of the firm are in fact relevant to the liquidation investment decisions of the firm these costs would be borne by the security holders of a failing firm

economic order quantity for items with imperfect quality revisited abstract we rectify a flaw in an economic order quantity eoq model with unreliable supply characterized by a random fraction of imperfect quality items and a screening process developed by salameh and jaber 2000 economic production quantity model for items with imperfect quality international journal of production economics 64 1 3 59 64 this leads to simple expressions of the optimal order quantity and expected profit per unit time we then analyze the effect of screening speed and variability of the supply process on the order quantity and show that the order quantity in our model is larger than that of the classical eoq model when the variability of the yield rate is reasonably low in addition we extend the model by allowing for several batches of imperfect quality items to be consolidated and shipped in one lot this is likely to be useful when there are economies of scale in shipping of imperfect quality items finally we present numerical results to illustrate the application of the model and draw insights

explaining differences in corporate capital structure theory and new evidence abstract this paper tests a theory of optimal capital structure based on three simple imperfections i personal and corporate taxes ii bankruptcy related costs and iii transfer of wealth from unprotected creditors in contrast to other empirical tests most of which rely on comparative statics to devise a linear regression we derive a testable equation explicitly from the firm s value maximizing first order condition our cross sectional tests confirm earlier findings by warner 1977 and ang et al 1982 that the fixed explicit costs of bankruptcy are not statistically significant however we find strong explanatory power in the marginal implicit costs of bankruptcy these costs have two components first the data suggest that firms with high fixed asset intensity carry heavier debt loads because of the floor that these assets create for potential bankruptcy costs to be borne by security holders this result explains inter industry differences in debt ratios found by schwartz and aronson 1967 and scott 1972 it also explains some anomalies in recent tests by bradley et al 1984 who find a positive relationship between debt ratios and depreciation when their model predicted a negative relation in our view depreciation acts more asa proxy for fixed asset and less as a proxy for non debt tax shield which bradley et al were analyzing secondly our tests suggest that an unprotected creditor or wealth transfereffect provides additional stimulus to issuance of debt and that this stimulus is stronger than the net tax effect schwartz 1981 finds such distributional explanations to be both economically meaningful and worthy of further empirical research because of its potential for initiating legal reform we modestly claim that our finding in this regard is an important first step in this research and is similar to the wealth transfer effect from bondholders to stockholders studied by masulis 1980 1983

economic production quantity model for items with imperfect quality subject to learning effects abstract salameh and jaber 2000 international journal of production economics 64 59 64 developed an inventory situation where items received are not of perfect quality defective and after 100 screening imperfect quality items are withdrawn from inventory and sold at a discounted price this paper extends the work of salameh and jaber by assuming the percentage defective per lot reduces according to a learning curve which was empirically validated by data from the automotive industry mathematical models are developed with numerical examples provided and discussed the developed model was compared with the model of salameh and jaber to emphasize the importance of learning

optimal monetary policy and determinacy under active passive regimes abstract should one expect inflation to be stable when monetary policy is passive according to the workhorse model for monetary policy analysis the answer should be no if the passive spell is too long in this paper i develop a new keynesian model in which monetary policy is optimal subject to a loose commitment constraint i show that there is a threshold degree of commitment such that the equilibrium is locally unique when monetary policy switches between active and passive stances regardless of the length of the passive spell this result also holds for a version of the model where the passive spell is endogenous and due to a demand shock driving the economy to the zero lower bound

resolution of financial distress under chapter 11 abstract we develop a contingent claims model for a firm in financial distress with a formal account for renegotiations under the u s bankruptcy procedure known as chapter 11 shareholders and two classes of creditors senior and junior alternatively propose a reorganization plan subject to a vote the bankruptcy judge can intervene in any renegotiation round to impose a plan the multiple stage bargaining process is solved in a non cooperative game theory setting the calibrated model yields the liquidation rate the duration of chapter 11 and the frequency of deviations from the absolute priority rule which are consistent with empirical evidence

has u s monetary policy tracked the efficient interest rate abstract interest rate decisions by central banks are universally discussed in terms of taylor rules which describe policy rates as responding to inflation and some measure of the output gap we show that an alternative specification of monetary policy in which the interest rate tracks the wicksellian efficient rate of return as the primary indicator of real activity fits the u s data better than otherwise identical taylor rules this result holds for a variety of specifications of the other ingredients of the policy rule including the output gap and of private agents behavior

three echelon supply chain coordination considering duopolistic retailers with perfect quality products abstract this paper explores channel coordination and profit division issues of a manufacturer distributer duopolistic retailers supply chain for a product where the manufacturer supplies lotsize of the product that contains a random portion of imperfect quality item in manufacturer stackelberg vertical game setting the duopolistic retailers three behaviours cournot collusion and stackelberg are discussed besides analyzing the effect of imperfect quality product on optimal decisions the paper depicts the hybrid contract mechanism so that all units quantity discount with franchise fee resolves channel conflict though unable to provide win win outcome for surplus profit division the paper proposes two sequential bargaining processes backward and forward where outcome of a nash bargaining is dependent on the previous it is found that for channel coordinated win win profit the manufacturer prefers collusion stackelberg and cournot while the retailer prefers the reverse and both prefer backward sequential bargaining but the distributers preference depends on the target profit that it sets during the bargaining process the proposed mechanisms are illustrated by a numerical example

economic ordering quantity models for items with imperfect quality abstract in this paper we first look at the issue of non shortages in models with proportional imperfect quality when the proportion of the imperfects is a random variable more specifically we revisit the papers of salameh and jaber int j prod econom 64 2000 59 and chan et al prod plann control 14 2003 588 and we point out that the sufficient conditions given in these papers to ensure that shortages will not occur may not really prevent their occurrence next considering the timing of withdrawing the imperfect quality items from stock we clarify a point not clearly stated in salameh and jaber int j prod econom 64 2000 59 and we extented this model to the case in which withdrawing takes place at the end of the planning horizon finally we establish that the objective of maximizing the mean average profit which was set in salameh and jaber int j prod econom 64 2000 59 is superfluous and the results given there can be obtained by ignoring the revenue issues assumed in the model and minimizing directly the mean average cost

the costs of bankruptcy chapter 7 liquidation versus chapter 11 reorganization our paper explores a comprehensive sample of small and large corporate bankruptcies in arizona and new york from 1995 to 2001 bankruptcy costs are very heterogeneous and sensitive to the measurement method used we find that chapter 7 liquidations appear to be no faster or cheaper in terms of direct expense than chapter 11 reorganizations however chapter 11 seems to preserve assets better thereby allowing creditors to recover relatively more our paper also provides a large number of further empirical regularities our paper analyzes the largest sample of corporate bankruptcies to date we research approximately 300 cases from the arizona and new york federal bankruptcy courts from 1995 to 2001 these cases consist of 1 both publicly traded and privately held corporations and 2 both chapter 7 liquidations and chapter 11 reorganizations this sample is practically the entire population of unique corporate bankruptcies in these courts our paper s primary objective is to measure how the two available bankruptcy procedures differ especially but not only in terms of cost we explore four variables namely the change in the estate s value during bankruptcy a measure of indirect costs the time spent in bankruptcy another and more common measure of indirect costs the expenses submitted to and approved by the bankruptcy court a measure of direct costs and the recovery rates for creditors and apr violations our most important findings are that chapter 7 liquidations are not cheaper than chapter 11 reorganizations particularly after we control for endogenous self selection of firms into bankruptcy procedure bankruptcy professionals attorneys accountants trustees regularly end up with most of the post bankruptcy firm s value in chapter 7 arturo bris is at imd yale school of management and ecgi ivo welch is at brown uni

economic order quantity for growing items abstract economic order production quantity eoq epq models have generally been presented for manufacturing products incorporating some important features of a specific category of products different eoq epq models have been proposed in literature this study proposes a new class of inventory models i e a model for a specific type of inventory items growing items poultry and livestock are good examples of growing inventory items we begin by proposing a general mathematical model which can be used for different types of growing items followed by a particular mathematical model for a specific type of poultry we calculate the optimal order quantity of the growing items at the start of a growing cycle the optimal length of the growing cycle and the optimal total profit numerical examples are provided for a type of poultry to illustrate the model a sensitivity analysis is presented to study the effect of the main parameters of the model in terms of its decision variables and objective function the results of the sensitivity analysis suggest that production costs are the most crucial parameter

new keynesian versus old keynesian government spending multipliers renewed interest in fiscal policy has increased the use of quantitative models to evaluate policy because of modelling uncertainty it is essential that policy evaluations be robust to alternative assumptions we find that models currently being used in practice to evaluate fiscal policy stimulus proposals are not robust government spending multipliers in an alternative empirically estimated and widely cited new keynesian model are much smaller than in these old keynesian models the estimated stimulus is extremely small with gdp and employment effects only one sixth as large and with private sector employment impacts likely to be even smaller we investigate the sensitivity of our findings with regard to the response of monetary policy the zero bound on nominal interest rates and the inclusion of an empirically relevant degree of rule of thumb behaviour in the new keynesian model in addition we relate our findings using estimated structural macroeconomic models to the recent literature using reduced form regression techniques

economic order quantity model for items with imperfect quality with learning in inspection abstract the economic order quantity eoq model is the simplest and earliest inventory model in the literature its simple mathematics is attributed to its assumptions which are rarely met salameh and jaber 2000 economic production quantity model for items with imperfect quality int j prod econ 64 59 64 addressed one of these assumptions that items received or produced are not of perfect quality this paper extends salameh and jaber s work for the case where there is learning in inspection the model is realistic in that it considers situations of lost sales and backorders mathematical models are developed with numerical examples provided and results discussed for the cases of i partial transfer of learning ii total transfer of learning and iii no transfer of learning