demand seasonality in retail inventory management abstract we investigate the value of accounting for demand seasonality in inventory control our problem is motivated by discussions with retailers who admitted to not taking perceived seasonality patterns into account in their replenishment systems we consider a single location single item periodic review lost sales inventory problem with seasonal demand in a retail environment customer demand has seasonality with a known season length the lead time is shorter than the review period and orders are placed as multiples of a fixed batch size the cost structure comprises of a fixed cost per order a cost per batch and a unit variable cost to model retail handling costs we consider four different settings which differ in the degree of demand seasonality that is incorporated in the model with or without within review period variations and with or without across review periods variations in each case we calculate the policy which minimizes the long run average cost and compute the optimality gaps of the policies which ignore part or all demand seasonality we find that not accounting for demand seasonality can lead to substantial optimality gaps yet incorporating only some form of demand seasonality does not always lead to cost savings we apply the problem to a real life setting using point of sales data from a european retailer we show that a simple distinction between weekday and weekend sales can lead to major cost reductions without greatly increasing the complexity of the retailer s automatic store ordering system our analysis provides valuable insights on the tradeoff between the complexity of the automatic store ordering system and the benefits of incorporating demand seasonality

an eoq model for perishable products with fixed shelf life under stochastic demand conditions abstract the paper presents a mathematical stochastic model for perishable open dating foods including shortage and outdating costs the demand fluctuations have been taken into account modeling them through a normal distribution and their impact on the storage time has been studied considering the stochastic nature of such a parameter in turn the quantification of perished products has been also addressed determining the probability for a product of remaining in stock beyond the end of its shelf life on the basis of such premises the optimal set of parameters that minimize the total unit cost has been determined a numerical application and a sensitivity analysis show the practical applicability of the proposed model in the context of warehouse management underlining managerial insights

exercise behavior valuation and the incentive effects of employee stock options abstract we use a large database on eso exercises to document characteristics of exercise behavior and calibrate a utility based model for measuring how differences in exercise behavior are manifested in option values and incentives option values and incentives computed from the model calibrations are compared to those computed from models used to value tradable options our analysis provides guidance to both academics and practitioners about how differences in exercise behavior and model choice affect measures of eso values and incentives and underscores the importance of gaining a thorough understanding of the underlying economic forces that affect the behavior of eso holders

parametric replenishment policies for inventory systems with lost sales and fixed order cost in this paper we consider a single item inventory system with lost sales and fixed order cost we numerically illustrate the lack of a clear structure in optimal replenishment policies for such systems however policies with a simple structure are preferred in practical settings examples of replenishment policies with a simple parametric description are the s s policy and the s nq policy besides these known policies in literature we propose a new type of replenishment policy in our modified s s policy we restrict the order size of the standard s s policy to a maximum this policy results in near optimal costs furthermore we derive heuristic procedures to set the inventory control parameters for this new replenishment policy in our first approach we formulate closed form expressions based on power approximations whereas in our second approach we derive an approximation for the steady state inventory distribution as a result the latter approach could be used for inventory systems with different objectives or service level constraints the numerical experiments illustrate that the heuristic procedures result on average in 2 4 percent and 1 8 percent cost increases respectively compared to the optimal replenishment policy therefore we conclude that the heuristic procedures are very effective to set the inventory control parameters

a note on the empirical effectiveness of formal fiscal restraints abstract an important agrument in the current debate over european monetary integration is that a monetary union requires formal fiscal restraints limiting individual member states budgetary powers to reduce the common monetary authority s risk of having to bail out insolvent member governments this note presents empirical evidence on the effectiveness of fiscal restraints on state budgets in the united states nonparametric tests reveal that fiscal restraints significantly affect the probability of fiscal choices and performance without however preventing extreme outcomes fiscal restraints induce substitution of nonrestricted for restricted debt instruments

the elusive costs and the immaterial gains of fiscal constraints we study whether fiscal restrictions affect volatilities and correlations of macrovariables and the probability of excessive debt for a sample of 48 us states fiscal constraints are characterized with a number of indicators and volatilities and correlations are computed in several ways the second moments of macroeconomic variables in states with different fiscal constraints are economically and statistically similar excessive debt and the mechanism linking budget deficit and excessive debts are independent of whether tight or loose fiscal constraints are in place creative budget accounting may account for the results

optimal ordering policies for periodic review systems with replenishment cycles in this paper we consider inventory models for periodic review systems with replenishment cycles which consist of a number of periods by replenishment cycles we mean that an order is always placed at the beginning of a cycle we use dynamic programming to formulate both the backorder and lost sales models and propose to charge the holding and shortage costs based on the ending inventory of periods rather than only on the ending inventory of cycles since periods can be made any time units to suit the needs of an application this approach in fact computes the holding cost based on the average inventory of a cycle and the shortage cost in proportion to the duration of shortage for the backorder model and remedies the shortcomings of the heuristic or approximate treatment of such systems hadley and whitin analysis of inventory systems prentice hall englewood cliffs nj 1963 we show that a base stock policy is optimal for the backorder model while the optimal order quantity is a function of the on hand inventory for the lost sales model moreover for the backorder model we develop a simple expression for computing the optimal base stock level for the lost sales model we derive convergence conditions for obtaining the optimal operational parameters

fiscal policy and monetary integration in europe fiscal policy economists policy makers and the media often argue that the maastricht treaty and the stability and growth pact make it difficult for governments of emu countries to stabilize their economies with appropriate fiscal policy and to provide adequate public investment our empirical analysis offers little support to this view discretionary budget deficits have actually become more counter cyclical in emu countries after the maastricht treaty as well as in the other eu and non eu industrialized countries we study and while public investment has declined recently in emu countries a similar tendency is apparent in other countries and started well before the maastricht treaty was signed jordi gali and roberto perotti

planning to cheat eu fiscal policy in real time using real time data from europe s stability and convergence programs we explore how fiscal plans and their implementation in the eu are determined we find that 1 implemented budgetary adjustment falls systematically short of planned adjustment and this shortfall increases with the projection horizon 2 variability in the eventual fiscal outcomes is dominated by the implementation errors 3 there is a limited role for traditional political variables 4 stock flow adjustments are more important when plans are more ambitious and 5 most importantly both the ambition in fiscal plans and their implementation benefit from stronger national fiscal institutions we emphasize also the importance of credible plans for the eventual fiscal outcomes roel beetsma massimo giuliodori and peter wierts

fiscal adjustment in eu countries a balance sheet approach abstract several european union countries have recently implemented or are envisaging fiscal operations which improve budgetary figures but have no structural impact on government finances we evaluate some of these measures using a balance sheet approach in particular we examine the degree to which reductions in government debt in eu countries has been accompanied by a decumulation of government assets in the runup to maastricht we find a strong correlation between changes in government liabilities and government assets and larger declines in government assets in countries starting from higher public debt levels

good bad or ugly on the effects of fiscal rules with creative accounting abstract do fiscal rules lead to fiscal adjustment or do they encourage the use of creative accounting this question is studied with a model in which fiscal rules are imposed on measured fiscal variables which can differ from true variables because there is a margin for creative accounting the probability of detecting creative accounting depends on its size and the transparency of the budget the model studies the effects on fiscal policy of a budget rule separating structural from cyclical effects and examines how these effects depend on the underlying fiscal distortion and on the degree of transparency of the budget

wealth and executive compensation using new data on the wealth of swedish ceos i show that higher wealth ceos receive stronger incentives since high wealth excluding own firm holdings implies low absolute risk aversion this is consistent with a risk aversion explanation to examine whether wealth is likely to proxy for power i use lagged wealth typically measured before the ceo was hired and the results remain for one of two incentive measures also the wealth incentive result is not stronger for ceos likely to face limited owner oversight finally wealth is unrelated to pay levels and is hence unlikely to proxy for skill the compensation of chief executives of large listed companies is often largely in the form of risky instruments such as shares and options since share prices are affected by many factors outside management control this exposes ceos to risk according to standard agency theory the risk inherent in incentive compensation should reduce optimal incentives looking across firms the evidence that volatile stock prices reduce incentives in actual compensation has been mixed see e g aggarwal and samwick 1999 core and guay 2001 and prendergast 2002 for different views the importance of risk for incentives is thus in dispute 1 this paper takes another look at ceo incentives exploiting variation in risk aversion rather than risk decreasing absolute risk aversion implies that a wealthy ceo is less risk averse than a similar same coefficient of relative risk aversion but less wealthy ceo wealth should therefore proxy for risk aversion wealth may also be related to ceo skill and power obviously using wealth variation empirically hinges on having adequate data on individual wealth i use swedish tax filings to construct a proxy of wealth in sweden tax authorities provide data on aggregate yearly income

the sensitivity of ceo wealth to equity risk an analysis of the magnitude and determinants abstract to control risk related incentive problems equity holders are expected to manage both the convexity and slope of the relation between firm performance and managers wealth i find stock options but not common stockholdings significantly increase the sensitivity of ceos wealth to equity risk cross sectionally this sensitivity is positively related to firms investment opportunities this result is consistent with managers receiving incentives to invest in risky projects when the potential loss from underinvestment in valuable risk increasing projects is greatest firms stock return volatility is positively related to the convexity provided to managers suggesting convex incentive schemes influence investing and financing decisions

defining the government s debt and deficit although the budget deficit and the public debt feature prominently in political debate and economic research there is no agreement about how they should be measured they can b e defined for different sets of public institutions including the nested sets corresponding to central government general government and the public sector and for any definition of government there are many measures of the debt and deficit including those generated by four kinds of accounts cash financial full accrual and comprehensive which can be derived from four nested sets of assets and liabilities each debt and deficit measure says something about public finances but none tells the whol e story each is also vulnerable to manipulation and is likely to be manipulated if it is subject to a binding fiscal rule or target narrow definitions of government encourage the shifting of spending to entities outside the defined perimeter of governme nt narrow definitions of debt and deficit encourage operations involving off balance sheets assets and liabilities while broad measures are susceptible to the mismeasurement of on balance sheet assets and liabilities reviewing the literature on these is sues the paper concludes that governments should publish several measures of the debt and deficit in a form that clearly reveals their interrelationships

when is fiscal adjustment an illusion fiscal adjustment is an illusion when it lowers the budget deficit or public debt but leaves government net worth unchanged conventional measures of the budget deficit largely show the change in public sector debt ideally the measured deficit would reflect the change in public sector net worth many people consider it impractical to try to measure public sector assets my paper does not discuss what the deficit should measure but instead proposes a positive and testable theory of how governments actually behave when an outside agent forces a reduction in a government s conventional deficit and debt accumulation the government responds by lowering asset accumulation or increasing hidden liabilities since government net worth is unchanged such fiscal adjustment is an illusion using data from countries with world bank and imf fiscal adjustment programmes and case studies of emu countries compliance with the maastricht criteria i confirm my theoretical predictions fiscal adjustment in these countries was at least partly an illusion

ceo stock option awards and the timing of corporate voluntary disclosures abstract we investigate whether ceos manage the timing of their voluntary disclosures around stock option awards we conjecture that ceos manage investors expectations around award dates by delaying good news and rushing forward bad news for a sample of 2 039 ceo option awards by 572 firms with fixed award schedules we document changes in share prices and analyst earnings forecasts around option awards that are consistent with our conjecture we also provide more direct evidence based on management earnings forecasts issued prior to award dates our findings suggest that ceos make opportunistic voluntary disclosure decisions that maximize their stock option compensation

inventory control in a lost sales setting with information about supply lead times abstract supply chain collaboration using advancements in information technology is on the rise and this includes sharing of information between suppliers and buyers in this paper we study the value of information about the development of supply lead times from a buyer s perspective we consider a periodically reviewed single item inventory system in a lost sales setting where at most one order can be outstanding at a time we compare the performance of an inventory model assuming informed lead times to a model assuming uninformed independent and identically distributed lead times we employ the dynamic programming approach to find the best state dependent ordering policy to minimize the expected average total cost per time unit our numerical results show that acquiring information about the development of supply lead times is of value in general the best policy suggested by the model assuming informed lead times causes lower average cost than the model assuming uninformed lead times

estimating the value of employee stock option portfolios and their sensitivities to price and volatility the costs associated with compiling data on employee stock option portfolios is a substantial obstacle in investigating the impact of stock options on managerial incentives accounting choice financing decisions and the valuation of equity we present an accurate method of estimating option portfolio value and the sensitivities of option portfolio value to stock price and stock return volatility that is easily implemented using data from only the current year s proxy statement or annual report this method can be applied to either executive stock option portfolios or to firm wide option plans in broad samples of actual and simulated ceo option portfolios we show that these proxies capture more than 99 of the variation in option portfolio value and sensitivities sensitivity analysis indicates that the degree of bias in these proxies varies with option portfolio characteristics and is most severe in samples of ceos with a large proportion of out of the money options however the proxies explanatory power remains above 95 in all subsamples

public accounting fudges towards emu a first empirical survey and some public choice considerations this paper analyses some one off measures and other accounting tricks that eu member states have been using to qualify for emu membership moving from empirical evidence to strategic goals this investigation brings to the fore three crucial issues the weakness of the methodological rules of the european system of accounts used to assess budgetary convergence in line with the maastricht treaty the open ended definition of the required budgetary discipline the shortcomings of the excessive deficit procedure enforced through the stability pact the conclusion urges a return to a strict annual balance requirement for governments current accounts to impede strategic adjustments of budgetary positions that are in fact creative accounting operations

compensation incentives and the duality of risk aversion and riskiness the common folklore that giving options to agents will make them more willing to take risks is false in fact no incentive schedule will make all expected utility maximizers more or less risk averse this paper finds simple intuitive necessary and sufficient conditions under which incentive schedules make agents more or less risk averse the paper uses these to examine the incentive effects of some common structures such as puts and calls and it briefly explores the duality between a fee schedule that makes an agent more or less risk averse and gambles that increase or decrease risk with the growing interest in executive compensation and agency problems

what do deficits tell us about debt empirical evidence on creative accounting with fiscal rules in the eu fiscal rules such as the excessive deficit procedure and the stability and growth pact sgp aim at constraining government behavior milesi ferretti 2003 develops a model in which governments circumvent such rules by reverting to creative accounting the amount of this depends on the reputation cost for the government and the economic cost of sticking to the rule we provide empirical evidence of creative accounting in the european union we find that the sgp rules have induced governments to use stock flow adjustments a form of creative accounting to hide deficits the tendency to substitute stock flow adjustments for budget deficits is especially strong for the cyclical component of the deficit as in times of recession the cost of reducing the deficit is particularly large

defining the government s debt and deficit defining the government s debt and deficit although the budget deficit and the public debt feature prominently in political debate and economic research there is no agreement about how they should be measured they can be defined for different sets of public institutions including the nested sets corresponding to central government general government and the public sector and for any definition of government there are many measures of the debt and deficit including those generated by four kinds of accounts cash financial full accrual and comprehensive which can be derived from four nested sets of assets and liabilities each debt and deficit measure says something about public finances but none tells the whole story each is also vulnerable to manipulation and is likely to be manipulated if it is subject to a binding fiscal rule or target narrow definitions of government encourage the shifting of spending to entities outside the defined perimeter of government narrow definitions of debt and deficit encourage operations involving off balance sheets assets and liabilities while broad measures are susceptible to the mismeasurement of on balance sheet assets and liabilities reviewing the literature on these issues the paper concludes that governments should publish several measures of the debt and deficit in a form that clearly reveals their interrelationships

does option compensation increase managerial risk appetite this paper solves the dynamic investment problem of a risk averse manager compensated with a call option on the assets he controls under the manager s optimal policy the option ends up either deep in or deep out of the money as the asset value goes to zero volatility goes to infinity however the option compensation does not strictly lead to greater risk seeking sometimes the manager s optimal volatility is less with the option than it would be if he were trading his own account furthermore giving the manager more options causes him to reduce volatility managers with convex compensation schemes play an important role in financial markets this paper solves for the optimal dynamic investment policy for a risk averse manager paid with a call option on the assets he controls the paper focuses on how the option compensation impacts the manager s appetite for risk when he cannot hedge the option position on one hand the convexity of the option makes the manager shun payoffs that are likely to be near the money under the optimal policy the manager either significantly outperforms his benchmark or else incurs severe losses furthermore in examples of optimal trading strategies asset volatility goes to infinity as asset value goes to zero yet option compensation does not strictly lead to greater risk seeking as asset value grows large or if the evaluation date is far away the manager moderates asset risk for example if the manager has constant relative risk aversion crra asset volatility converges to the merton constant as asset value goes to infinity in some situations the manager actually chooses a lower asset volatility than he would if he were investing on his own because the leverage inherent in his option magnifies his exposure to the asset volatility in addition with all constant or decreasing absolute risk averse utility functions from the hyperbolic absolute risk averse hara class giving the manager more options causes him to reduce asset volatility in the crra case for example the manager targets a fixed volatility for his personal

the r q control of a periodic review inventory system with continuous demand and lost sales abstract in this paper we consider a periodic review inventory model with lost sales during a stockout and with the constraint that at most one replenishment order may be outstanding at any time demands in successive review periods are independent identically distributed variables from a continuous distribution the fixed lead time is an integral number of review periods we explore control policies of the r q type that is a replenishment order of size q is placed when the inventory position stock in hand plus stock on order falls to or below the re order level r we use asymptotic renewal theory results to estimate the undershoot of the re order level r and also to estimate the cycle stockholding cost which turns out to take a relatively simple form based on these approximations we set out a policy improvement solution methodology and illustrate this with some numerical examples for which demand is normally distributed these numerical examples suggest that a relatively simple approach based on the economic order quantity can provide results which are very close to optimal