perishable inventory theory a review this paper reviews the relevant literature on the problem of determining suitable ordering policies for both fixed life perishable inventory and inventory subject to continuous exponential decay we consider both deterministic and stochastic demand for single and multiple products both optimal and sub optimal order policies are discussed in addition a brief review of the application of these models to blood bank management is included the review concludes with a discussion of some of the interesting open research questions in the area

rational household labor supply traditionally household behavior is derived from the maximization of a unique utility function in this paper we propose an alternative approach in which the household is modeled as a two member collectivity taking pareto efficient decisions the consequences of this assumption are analyzed in a three good model in which only total consumption and each member s labor supply are observable if the agents are assumed egoistic i e they are only concerned with their own leisure and consumption it is possible to derive falsifiable conditions upon household labor supplies from both a parametric and nonparametric viewpoint if alternatively agents are altruistic restrictions obtain in the nonparametric context useful interpretation stems from the comparison with the characterization of aggregate demand for a private good economy

children as collective goods and divorce settlements the failure of many divorced fathers to comply with court mandated child support awards has been identified as a major reason why a growing number of children live in poverty in female headed households this paper presents a model that seeks to explain why so many divorced fathers allow their children s welfare to suffer as a consequence of divorce the point of departure is the recognition that children are collective consumption goods from the point of view of the father and mother within marriage proximity and altruism serve to overcome the free rider problem associated with the provision of public goods however on divorce the noncustodial parent suffers a loss of control over the allocative decisions of the custodial parent and it is not feasible for the couple to achieve a pareto optimal allocation of their joint resources a model of optimal marriage contracts is constructed in which a couple decides on the allocation of resources within marriage and on the terms of a settlement in the event

advanced supply chain planning with mixtures of backorders lost sales and lost contract abstract this paper investigates a supply chain system in which a supplier prepares for the selling season by building stock levels prior to the beginning of the season and shortages realized at the beginning of the season are represented as mixtures of backorders and lost sales backlogged items are replenished as soon as possible through an emergency procurement as opposed to waiting until the next scheduled delivery as in many continuous review scenarios and the backorder rate is modeled as a piecewise linear function of the magnitude of the shortage the often intangible cost associated with lost sales and customer goodwill is also quantified in particular the buyer and supplier are engaged in a contractual agreement and the loss of customer goodwill from the supplier s perspective is represented as the expected cost associated with violating the conditions of the contract the likelihood of contract cancellation is also represented as a function of the magnitude of shortage the optimal solution is derived in closed form for the case of exponential demand distribution and an example problem is illustrated with numerical data in order to demonstrate calculation of the optimal solution and corresponding sensitivity analysis for demand distributions in which the solution cannot be expressed in closed form

political economic markets perts and pests in food and agriculture j i lyniversity of california berkeley jjept of agricultural and resource economic l working paper al cljdare i lorking paper 0 231 politic eco lic l rxets a d pests i j food l ti achiculture by per ts cordon c rausser ja nlnl tt junot tlon a riii ent st ticn giannini fou 1cl itiol1of ar ricultllrnj econo ll i cs july 11 w

spousal conflict and divorce the optimal balance between keeping marriages intact despite spousal conflict and allowing for divorce is a subject of policy debate in the united states to explore the trade offs i construct a structural model with information asymmetries which may generate inefficient outcomes parameters are estimated using data from the national survey of families and households i find that eliminating separation periods decreases the conflict rate by 9 2 of its baseline level and increases the divorce rate by 4 0 perfect child support enforcement decreases the frequency of conflict and divorce by 2 7 and 21 2 respectively and reduces the incidence of inefficient divorces

domestic violence a nonrandom affair in this paper we develop and estimate a model of domestic violence we extend a noncooperative model of the family to include violence as a source of gratification and an instrument for controlling behavior we estimate the model by robust methods since the violence process appears to have a heavy tailed nonnormal error distribution we find that the properties of the equilibria depend on family income for low middle income families our results indicate an equilibrium in which one person s reservation utility constraint is binding whereas for higher income families both individuals may gain from the relationship

marriage divorce and asymmetric information we use data on people s valuations of options outside marriage and beliefs about spouses options the data demonstrate that in some couples one spouse would be happier and the other spouse unhappier outside of some marriages suggesting that bargaining takes place and that spouses have private information we estimate a bargaining model with interdependent utility that quantifies the resulting inefficiencies our results show that people forgo some utility in order to make their spouses better off and in doing so offset much of the inefficiency generated by their imperfect knowledge thus we find evidence of asymmetric information and interdependent utility in marriage

the gains from agricultural research under distorted trade abstract this paper explores the gains from research issue within the framework of a product which is traded with the aid of export subsidies because of the taxpayer burden associated with increased exports it is quite possible for the returns to research to be negative a decline in the rate of protection through a rising world market leads to a linear increase in the gains from research while a rise in the internal support price will cause a non linear and negative response if the supply shift is pivotal and a linear and negative response if it is parallel finally global returns to research will be higher than individual country returns and will always be positive in a free trade environment

until death do you part the effects of unilateral divorce on spousal homicides this study examines how the widespread adoption of unilateral divorce influenced the prevalence of lethal spousal violence in the united states these evaluations are based on fixed effects specifications for spousal homicide counts from an annual panel of u s states from 1968 to 1978 the results indicate that unrestricted unilateral divorce laws had small and statistically insignificant effects on the amount of lethal spousal violence directed against wives however the easy access to divorce created by such laws increased spousal homicides of husbands by approximately 21 these increases were concentrated in states where the division of marital property favored husbands

an economic model of cohabitation and divorce abstract the positive correlation between the rates of cohabitation and divorce has long been established this paper seeks to determine the direction of causation between these two variables a simultaneous equations model is specified with cohabitation and divorce rates as endogenous variables and using data aggregated to the state level for 1990 this procedure suggests that the divorce rate is a significant factor in explaining variations across states in the cohabitation rate and that the divorce rate is itself influenced by cohabitation behavior this finding strengthens the results put forth by various economic and sociological single equation studies this synthesis of information and data provided by sociologists with economic theory and methodology suggests further research in modelling demographic variables as joint outcomes of the same process

bargaining piecemeal or all at once perfect information rubinstein style bargaining models are used to explore questions about multiple issue bargaining is it ever sensible to offer on only a subset of the issues being bargained what is the effect of limiting offers so that they must cover all issues we conclude that in realistic settings the answer to the first question is yes and that restricting offers to those covering all issues may be harmful to one or both parties

the excess sensitivity of layoffs and quits to demand excessive layoffs in bad times and excessive quits in good times both stem from the same weakness in practical employment arrangements the specific nature of worker firm relations creates a situat

the impact of divorce laws on marriage specific capital this article considers how divorce law alters the incentives for couples to invest in their marriage focusing on the impact of unilateral divorce laws on investments in new marriages differences across states between 1970 and 1980 provide useful quasi experimental variation with which to consider incentives to invest in several types of marriagespecific capital spouse s education children household specialization and home ownership i find that adoption of unilateral divorce regardless of the prevailing property division laws reduces investment in all types of marriage specific capital considered except home ownership in contrast results for home ownership depend on the underlying property division laws

cleaning in the shadow of the law bargaining marital investment and the impact of divorce law on husbands intrahousehold work abstractprevious literature has established that unilateral divorce laws may reduce women s household work and overall marital investment if unilateral divorce has differential costs by gender it may impact household work by gender through bargaining channels however little research has examined how divorce laws affect men s levels and share of household production to examine this i use data on matched couples from the panel study of income dynamics and exploit time variation in state divorce laws i find that unilateral divorce laws lead to a decrease in marital investment as measured by mens and women s household work the evidence also supports a bargaining response to divorce laws as fathers in states without joint custody laws engage in a significantly higher share of household work under unilateral divorce than those in states with joint custody laws consistent with a higher cost of marital dissolution among fathers who stand to lose custody of their children

domestic violence and divorce law when divorce threats become credible the cost of divorce influences the bargaining position of spouses and thus their behavior within the marriage this study takes advantage of a major and unexpected reduction in divorce costs in spain to estimate the causal effects on domestic violence results suggest a 30 decline in spousal conflict as a consequence of the reform spousal violence is found to have decreased among couples who remained married after the modification in the law which suggests an important role for changes in bargaining within the marriage when divorce becomes a more credible cheaper option

bargaining in the shadow of the law divorce laws and family distress this paper exploits the variation occurring from the different timing of divorce law reforms across the united states to evaluate how unilateral divorce changed family violence and whether the option provided by unilateral divorce reduced suicide and spousal homicide unilateral divorce both potentially increases the likelihood that a domestic violence relationship ends and acts to transfer bargaining power toward the abused thereby potentially stopping the abuse in extant relationships in states that introduced unilateral divorce we find a 8 16 percent decline in female suicide roughly a 30 percent decline in domestic violence for both men and women and a 10 percent decline in females murdered by their partners

a model of crop planning under uncertainty in agricultural management abstract the crop planning problem is often formulated as a linear programming problem but in many actual cases the profit coefficients for agricultural products are not certain values because of the influence of the future weather so a linear programming model with constant coefficients does not describe the environment of decision making properly therefore we propose a model of crop planning with uncertain stochastic values which may support decision making of agricultural farms in this paper we treat such uncertain elements as the values with the fuzziness and randomness

review of inventory systems with deterioration since 2001 abstract this paper presents an up to date review of the advances made in the field of inventory control of perishable items deteriorating inventory the last extensive review on this topic dates back to 2001 goyal s k and giri b c recent trends in modeling of deteriorating inventory european journal of operational research 134 1 16 since then over two hundred articles on this subject have been published in the major journals on inventory control indicating the need for a new review we use the classification of goyal and giri based on shelf life characteristics and demand characteristics contributions are highlighted by discussing main system characteristics including price discounts backordering or lost sales single or multiple items one or two warehouses single or multi echelon average cost or discounted cash flow and payment delay

domestic farm policy and the gains from trade reply a general equilibrium model is used to demonstrate that in the presence of domestic subsidies trade can be welfare reducing relative to autarky mcdonald s comment claims that trade is always welfare improving with domestic production subsidies he states that when deriving a no gains from trade point with production subsidies schmitz sigurdson and doering ssd 1986 1988 and anania and bohman ab mistakenly confuse the overall welfare effects of a production subsidy with the welfare effects of free trade first we show that ab made the correct welfare comparison using a partial equilibrium model and then extend the results using a general equilibrium model

preservation technology investment for deteriorating inventory abstract the objective of this study is to develop a deteriorating inventory policy when the retailer invests on the preservation technology to reduce the rate of product deterioration a solution procedure is presented to determine an optimal replenishment cycle shortage period order quantity and preservation technology cost such that the total profit per unit time is maximized a numerical example and sensitivity analysis are presented to illustrate the model

did unilateral divorce raise divorce rates evidence from panel data since early 1996 at least eight states have begun to consider rolling back unilateral and no fault divorce a major reversal of the liberalizing trend in divorce laws which began around 1970 the proponents of tightening the divorce regime often argue that making divorce more difficult will strengthen families however both theoretical and empirical evidence is decidedly mixed over whether the no fault revolution actually contributed to the sharp increase in divorce rates in the united states observed over the last 30 years in this paper i address the dispute by using a panel of state level divorce rates including state specific trends allows unobserved state divorce propensities to trend linearly and even quadratically over time and reveals that unilateral divorce raised divorce rates significantly and strongly excerpt

gatt and agriculture the role of special interest groups a the 1980s have been a decade of crisis for much of world agriculture following a period of unusual growth in world demand and trade the 1980s have witnessed a decline in exports plummeting agricultural prices widespread economic distress in farming and associated industries and rising trade tensions as nations have sought to protect their farmers institute for international economics p 1 b the playing field in world agricultural trade is uneven some countries subsidize their exports some tax imports others tax exports most nations try to help their farmers through domestic farm programs all these influences converge to distort the price signals that would otherwise govern supply and demand in a freer trade environment the resulting hodgepodge has disadvantaged many producers in the united states and other countries even though their farm products are among the least expensive to produce ballenger dunmore and lederer p 1 c the problems of agriculture have engaged the attention of world leaders and have become a major issue in the uruguay round of multilateral trade negotiations under the general agreement on tariffs and trade gatt a number of fora including the gatt ministerial meeting at punta del este in september 1986 that launched the uruguay round the organization for economic cooperation and development oecd ministerial meeting in may 1987 and the venice summit of industrial country leaders in june 1987 have issued declarations which support liberalization of agricultural trade and reform of domestic farm policies trade ministers of the gatt countries will also meet in december 1988 in

handling uncertainty in agricultural supply chain management a state of the art given the evolution in the agricultural sector and the new challenges it faces managing agricultural supply chains efficiently has become an attractive topic for researchers and practitioners against this background the integration of uncertain aspects has continuously gained importance for managerial decision making since it can lead to an increase in efficiency responsiveness business integration and ultimately in market competitiveness in order to capture appropriately the uncertain conjuncture of most agricultural real life applications an increasing amount of research effort is especially dedicated to treating uncertainty in particular quantitative modeling approaches have found extensive use in agricultural supply chain management this paper provides an overview of the latest advances and developments in the application of operations research methodologies to handling uncertainty occurring in the agricultural supply chain management problems it seeks to i offer a representative overview of the predominant research topics ii highlight the most pertinent and widely used frameworks and iii discuss the emergence of new operations research advances in the agricultural sector the broad spectrum of reviewed contributions is classified and presented with respect to three most relevant discerned features uncertainty modeling types programming approaches and functional application areas ultimately main review findings are pointed out and future research directions which emerge are suggested

taxes and transfers their effects on the decision to end a marriage abstract the transfer system typically has large marriage disincentives while the income tax system is likely to subsidize marriage for many low income families in other words the tax system may offset an increase in transfer benefits associated with marital separation the interaction of the transfer system with the income tax system has largely been overlooked the income tax system has become more relevant for low income families with the recent expansion of the earned income tax credit which filers may be eligible for even if their tax liability is zero this paper uses family level measures of the change in transfer benefits and tax liability associated with a change in family structure to consider the effect of these financial incentives on separation decisions

a multi objective robust optimization model for multi product multi site aggregate production planning in a supply chain under uncertainty abstract manufacturers need to satisfy consumer demands in order to compete in the real world this requires the efficient operation of a supply chain planning in this research we consider a supply chain including multiple suppliers multiple manufacturers and multiple customers addressing a multi site multi period multi product aggregate production planning app problem under uncertainty first a new robust multi objective mixed integer nonlinear programming model is proposed to deal with app considering two conflicting objectives simultaneously as well as the uncertain nature of the supply chain cost parameters of the supply chain and demand fluctuations are subject to uncertainty then the problem transformed into a multi objective linear one the first objective function aims to minimize total losses of supply chain including production cost hiring firing and training cost raw material and end product inventory holding cost transportation and shortage cost the second objective function considers customer satisfaction through minimizing sum of the maximum amount of shortages among the customers zones in all periods working levels workers productivity overtime subcontracting storage capacity and lead time are also considered finally the proposed model is solved as a single objective mixed integer programming model applying the lp metrics method the practicability of the proposed model is demonstrated through its application in solving an app problem in an industrial case study the results indicate that the proposed model can provide a promising approach to fulfill an efficient production planning in a supply chain

female labor supply and divorce new evidence from ireland if participation in the labor market helps to secure women s outside options in the case of divorce separation an increase in the perceived risk of marital dissolution may accelerate the increase in female labor supply this simple prediction has been tested in the literature using time and or spatial variation in divorce legislation e g across us states leading to mixed results in this paper we suggest testing this hypothesis by exploiting a more radical policy change i e the legalization of divorce in ireland the right to divorce was introduced in 1996 followed by an acceleration of marriage breakdown rates we use this fundamental change in the irish society as a natural experiment we follow a difference in difference approach using families for whom the dissolution risk is small as a control group our results suggest that the legalization of divorce contributed to a significant increase in female labor supply mostly at the extensive margin results are not driven by selection and are robust to several specification checks including the introduction of household fixed effects and an improved match between control and treatment groups using propensity score reweighting

the game of negotiations ordering issues and implementing agreements abstract we use a two issue bargaining model with asymmetric information to study agent choice of how to structure bargaining we uncover the settings in which different agenda structures are chosen in equilibrium how the order in which issues are bargained over matters and what impact the rules for implementing agreements have if agreements are implemented as they are reached easy issues are negotiated first and hard issues later if agreements are implemented only after all issues are settled then it is size that matters with large issues settled first all parties prefer the former rules of implementation to the latter

gender agricultural production and the theory of the household virtually all models of the household assume that the allocation of resources is pareto efficient within many african households agricultural production occurs on many plots controlled by different members of the household pareto efficiency implies that factors should be allocated efficiently across these plots i find in contrast that plots controlled by women are farmed much less intensively than similar plots within the household controlled by men the estimates imply that about 6 percent of output is lost because of inefficient factor allocation within the household the paper suggests a new approach to modeling intrahousehold allocation consistent with the empirical results

gains from trade inefficiency of government programs and the net economic effects of trading a great deal has been written on the inefficiencies of government farm programs and associated welfare effects e g just hueth and schmitz 1982 gardner 1983 1987 schmitz sigurdson and doering 1986 schmitz 1988 however common measures of inefficiency and distributional impact have not addressed the following question how are gains from trade and the inefficiencies of government programs related from a policy perspective knowing the trade impacts of government programs is at least as important as knowing the inefficiency effects for example is it possible for gains from trade to outweigh farm program inefficiencies alternatively could it be that negative trade impacts combined with farm program inefficiencies create situations in which no trade would be preferred to trade under existing government policy distortions in this paper we establish the link between classic gains from trade and the inefficiency of distortionary government programs using this framework we show both theoretically and empirically that the net economic effects of trading can be negative i e no trade would be preferred to trade under distortions we show that

marital division of labor with risk of divorce the role of voice enforcement of contracts it is assumed that emotional ties can be relied on to enforce implicit marital contracts by voice therefore in the present model divorce has economic consequences not only because the economies of scale from living together are destroyed but also because the scope for such voice enforcement is weakened moreover perhaps surprisingly i find that it is ambiguous how an increase in the probability of divorce influences predivorce allocation of time even when preferences are assumed to be homothetic

marriage and divorce informational constraints and private contracting the relationship between divorce rates in the united states and laws regulating divorce are analyzed using data from a special current population survey undertaken in 1979 with particular reference to the adoption by many states of no fault divorce laws the author utilizes a contract theoretic framework to examine the impact of both legal and informational constraints on several aspects of the marriage relationship 1 the probability of divorce 2 compensation at divorce i e the terms of the divorce settlement 3 the probability of entering marriage and 4 incentives for investment in marriage specific capital two different models are developed the first assumes that ex post information about the value of each spouses opportunites at divorce is symmetric and that since divorce would only occur if the joint benefits outweigh the joint costs the law has no effect on the divorce rate the second model asserts that the existence of asymmetric information results in a fixed wage marriage contract and that divorce would be higher in states that allow unilateral divorce the evidence supports the first of these hypotheses excerpt

canadian contributions to family economics canadian scholars have made substantial contributions to the relatively new field of family economics these include new models of how men and women match in marriage markets and of how decisions are made in multi person households several were early contributors to the literature on married women s labour supply and labour supply in a family context and helped to develop empirical methods in this area a particular focus has been on the impacts of policy relevant parameters such childcare costs on family labour supply and child well being new work on child development the impact of early life conditions and the processes of intergenerational transmission also highlight the importance of family context in determining economic well being

the international effects of u s farm subsidies using dynamic programming this paper examines effects of farm subsidies on u s exports of corn cotton rice and wheat the six policy simulations described here explore alternative proposals in the current round of the general agreement on tariffs and trade the analysis leads to two conclusions first abolishing domestic subsidies lowers world prices of these crops second imposing tighter supply controls may not actually decrease exports in the short run

the empirical content of nash bargained household behavior in households whose allocation decisions can be represented as nash bargained household decisions extrahousehold environmental parameters eeps serve as pure shifters of the threat points the comparative statics of changes in demands due to changes in these eeps are given these are incorporated into a comprehensive statement of the empirical content of nash bargained household behavior including a nash generalization of barten s 1966 fundamental matrix equation of the theory of consumer demand estimation and data requirements are discussed along with nested testing of the following structure the neoclassical model is nested in the nash bargained model which in turn is nested in an unrestricted model of household demands emphasized throughout is the enriched menu of explanatory variables for demand analysis provided by the nash model as well as the model s ability to jointly analyze i household formation and ii intrahousehold allocation decisions

domestic farm policy and the gains from trade this paper assesses the extent to which the gains from agricultural trade are influenced by both u s domestic policy and tariff and nontariff trade barriers it shows theoretically that the volume of trade can be substantial but the gains nonexistent empirical results along with rent seeking arguments support the no gains from trade hypothesis

production planning for a deteriorating item with stochastic demand and consumer choice abstract this paper concerns inventory control of a deteriorating product with non negligible procurement lead time that perishes after a known number of periods demand for fresh products during each period is represented as a random variable with known probability distribution but only a fraction of this demand is satisfied during any given period due to item deterioration we derive the expected profit function for a two period problem with one production opportunity before the selling season begins and a single product type with two period shelf life for the case in which demand during both periods is uniform independent and identically distributed we identify sufficient conditions for the existence of an optimal solution and present a straightforward procedure for obtaining the solution

optimal replenishment policies for non instantaneous deteriorating items with stock dependent demand abstract wu et al 2006 an optimal replenishment policy for non instantaneous deteriorating items with stock dependent demand and partial backlogging international journal of production economics 101 369 384 established an inventory model for non instantaneous deteriorating items with stock dependent demand and obtained the optimal replenishment policy in this paper we first amend wu et al s model by changing the objective to maximizing the total profit secondly we set a maximum inventory level in the model to reflect the facts that most retail outlets have limited shelf space thirdly we relax the restriction of zero ending inventory when shortages are not desirable we then establish the theoretical results and provide an algorithm to find the optimal solution finally we present some numerical examples to illustrate the results