the performance of agricultural market advisory services in corn and soybeans the purpose of this article is to evaluate the performance of market advisory services for the 1995 2003 corn and soybean crops a new database from the agricultural market advisory services agmas project is used in the evaluation this database should not be subject to survivorship and hindsight biases overall the results provide little evidence that advisory services as a group outperform market benchmarks particularly after considering risk the evidence is more positive versus the farmer benchmarks even after taking risk into account results also suggest that it is difficult to predict the pricing performance of advisory services across crop years

structural evolution of the postwar u s economy we consider a time varying parameter vector autoregressive model with stochastic volatility and mixture innovations to study the empirical relevance of the lucas critique for the postwar u s economy the model allows blocks of parameters to change at endogenously estimated points of time contrary to the lucas critique there are large changes at certain points of time in the parameters associated with monetary policy that do not correspond to changes in reduced form parameters for inflation or the unemployment rate however the structure of the u s economy has evolved considerably over the postwar period with an apparent reduction in the late 1980s in the impact of monetary policy shocks on inflation though not on the unemployment rate related we find changes in the phillips curve tradeoff between inflation and cyclical unemployment measured as the deviation from the time varying steady state unemployment rate implied by the model in the 1970s and especially since the mid 1990s

joint management of capacity and inventory in make to stock production systems with multi class demand we evaluate the benefits of coordinating capacity and inventory decisions in a make to stock production environment we consider a firm that faces multi class demand and has additional capacity options that are temporary and randomly available we formulate the model as a markov decision process mdp and prove that a solution to the optimal joint control problem exists for several special cases we characterize the structure of the optimal policy for the general case however we show that the optimal policy is state dependent and in many instances non monotone and difficult to implement therefore we consider three pragmatic heuristic policies and assess their performance we show that the majority of the savings originate from the ability to dynamically adjust capacity and that a simple heuristic that can adjust production capacity based on workload fluctuation but uses a static production rationing policy can result in significant savings

forward and futures contracts as preharvest commodity marketing instruments empirically significant differences between forward and futures contracts evidence their imperfect substitutability as preharvest marketing instruments certain combinations of market conditions make the two types of contracts complementary rather than interchangeable forwards and futures differ conceptually because of lumpiness marking to market and basis of these differences basis constitutes the most important factor although lumpiness may affect smaller producers it represents an inconsequential detail for larger traders in given years interest income cost resulting from futures margin requirements may reach important absolute amounts relative to size of basis and price changes this factor fails to attain a magnitude of practical significance

a real options approach to labour shifts planning under different service level targets abstract firms that experience uncertainty in demand as well as challenging service levels face among other things the problem of managing employee shift numbers decisions regarding shift numbers often involve significant expansions or reductions in capacity in response to changes in demand in this paper we quantify the impact of treating shifts in workforce expansion as investments while considering required service level improvements the decision to increase shifts whether by employing temporary workers or hiring permanent employees is one that involves significant risks traditional theories typically consider reversible investments and thus do not capture the idiosyncrasies involved in shift management in which costs are not fully reversible in our study by using real options theory we quantify managers ability to consider this irreversibility aiming to enable them to make shift decisions under conditions of uncertainty with the maximum level of flexibility our model aims to help managers make more accurate decisions with regard to shift expansion under service level targets and to defer commitment until future uncertainties can be at least partially resolved overall our investigation contributes to studies on the time required to introduce labour shift changes while keeping the value of service level improvements in mind

human capital producer education programs and the adoption of forward pricing methods using a sample of 509 kansas producers we evaluate factors affecting adoption of forward pricing methods we focus on producers human capital accumulation and its effect on adoption of forward pricing techniques probit models are employed to evaluate producers participation in educational programs and their forward pricing adoption decisions tobit models are employed to evaluate individual levels of adoption of these techniques in the marketing of wheat corn grain sorghum soybeans and cattle

serial supply chains with economies of scale bounds and approximations we consider two models of stochastic serial inventory systems with economies of scale for which the forms of optimal policies are known in the first model each stage has a fixed order quantity while in the second model there is a fixed order cost for external supplies for each model we show that the optimal policy parameters can be bounded and approximated by a series of independent single stage optimal policy parameters we further construct closed form bounds and approximations for the single stage solutions and apply them to the serial systems these results provide simple and effective solutions that will help to facilitate implementations in practice they also allow us to see the connections between the serial and single stage systems and sharpen our intuition on optimal policy parameters and system behavior

evaluating echelon stock r nq policies in serial production inventory systems with stochastic demand this paper studies echelon stock r nq policies in serial production inventory systems with stochastic demand we provide a recursive procedure to compute the steady state echelon inventory levels of the systems which can be used to evaluate the long run average holding and backorder costs as well as other performance measures the procedure is based upon an observation of a relationship between the inventory status of adjacent stages in a serial system we also device exact formulas for replenishment frequencies and setup costs our results apply to both continuous review systems with compound poisson demand and periodic review systems with independent identically distributed demands a preliminary numerical study was conducted to explore the cost effectiveness of echelon stock r nq policies for two stage systems with simple poisson demand we compared among the minimum costs of echelon stock r nq policies a lower bound on the minimum achievable costs and the minimum costs of installation stock r nq policies finally we present a modification of an existing approximate evaluation procedure

theory of the firm with joint price and output risk and a forward market expected utility maximizing farmers facing just price risk or both price risk and quantity risk behave similarly in the absence of a forward market if forward contracting is possible that is not true because variation in the commodity price affects a farmer s wealth through the value of his futures position the value of his output and through the covariance between price and output this covariance affects a farmer s optimal scale of production his optimal forward position and the interrelationship between the scale of production and forward trading

exact evaluation of batch ordering inventory policies in two echelon supply chains with periodic review this paper studies a two echelon supply chain with stochastic and discrete consumer demand batch order quantities periodic inventory review and deterministic transportation times reorder point policies manage inventories at every location average inventory backorders and fill rates are evaluated exactly for each location safety stock is evaluated exactly at the lower echelon and a good approximation is detailed for the upper echelon numerical data are presented to demonstrate the model s utility it is found that system costs generally increase substantially if the upper echelon is restricted to carry no inventory of if the upper echelon is required to provide a high fill rate in many cases it is optimal to set the upper echelon s reorder point to yield near zero safety stock yet in some cases this simple heuristic can significantly increase supply chain operating costs finally policies selected under the assumption of continuous inventory review can perform poorly if implemented in an environment with periodic review

marketing models and the lucas critique the lucas critique has been largely ignored in the marketing literature we present a number of conditions under which the critique is most likely to also apply in marketing settings next we provide some perspectives on how to diagnose and accommodate the lucas critique and identify various avenues for future research

optimal dynamic hedging in unbiased futures markets a discrete time dynamic hedging problem is solved under expected utility maximization and basis risk without imposing a particular parametric form for utility nor assuming normally distributed cash and futures prices the solution is valid for any increasing and strictly concave utility function and for quite general specifications of the joint distribution of cash and futures prices this generality is achieved by restricting the futures market to be unbiased and requiring that the size of the cash position be nonstochastic the dynamic hedging rule can be estimated empirically using similar methods to those used to estimate static hedge ratios

rational expectations and the paradox of policy relevant natural experiments abstract policy experiments using large microeconomic datasets have recently gained ground in macroeconomics imposing rational expectations we examine robustness of evidence derived from ideal natural experiments applied to atomistic agents in dynamic settings paradoxically once experimental evidence is viewed as sufficiently clean to use it then becomes contaminated by ex post endogeneity measured responses depend upon priors and the objective function into which evidence is fed moreover agents policy beliefs become endogenously correlated with their causal parameters severely clouding inference e g sign reversals and non invertibility may obtain treatment control differences are contaminated for non quadratic adjustment costs constructively we illustrate how inference can be corrected accounting for feedback and highlight factors mitigating contamination

prospect theory and risk preferences of oregon seed producers prospect theory relates risk preference classifications to gains and losses from a reference income level this study applies prospect theory to reinterpret historical studies of risk preferences of oregon grass seed growers a significant relationship between changes in classifications of preferences and changes in income was found results indicated that those who lost income were concentrated in the category of changing to risk preferrers income changes calculated from crop combinations were also found to be correlated in a theoretically correct pattern with positive measures of risk from crop enterprises the research therefore is consistent with further applications of prospect theory to farm management

estimating new keynesian phillips curves a full information maximum likelihood approach abstract the new keynesian phillips curve has recently become an important ingredient in monetary policy models however using limited information methods the empirical support for the new keynesian phillips curve appear to be mixed this paper argues by means of monte carlo simulations with a simple new keynesian sticky price model that single equations methods e g gmm are likely to produce imprecise and biased estimates then it is argued that estimating the model with full information maximum likelihood fiml is a useful way of obtaining better estimates finally a version of the model used in the monte carlo simulations is estimated on u s data with fiml and although the pure forward looking new keynesian phillips curve is rejected a version with both forward and backward looking components provides a reasonable approximation of u s inflation dynamics

regime shifts and the stability of backward looking phillips curves in open economies abstract we assess the stability of open economy backward looking phillips curves estimated over two different exchange rate regimes we calibrate a new keynesian monetary policy model and employ it for producing artificial data a monetary policy break replicating the move from a target zone regime to a free floating regime implemented in sweden in 1992 is modeled we employ two different plausibly calibrated taylor rules to describe the swedish monetary policy conduct and fit a reduced form phillips curve to the artificial data while not rejecting the statistical relevance of the lucas critique we find that its economic importance does not seem to be overwhelming

optimal policy for a two stage assembly system under random demand this paper considers an inventory system in which an end product is assembled from two components each of which is ordered from an external supplier only the end product has final demand which is assumed to be random using the functional equation approach of dynamic programming we characterize the forms of both the optimal order policy for the components and the optimal assembly policy of the end product for a multiperiod problem of arbitrary but finite length we believe that this work represents the only exact analysis of an mrp type assembly system when demand is stochastic

inventory cost rate functions with nonlinear shortage costs this article considers five cost rate models for inventory control each summarizing the expected holding and shortage costs per period as a function of the inventory position all models have linear holding costs and shortage cost coefficients of dimension unit period unit and period the latter two coeficients may be the shadow costs of a fill rate and a ready rate service constraint respectively one of the cost rate models is a new suggestion intended to facilitate modeling of periodic review inventory systems if and only if conditions on the demand process are presented for which the cost rate is quasi convex in the inventory position the typical sufficient condition requires that the cumulative demand distribution be logconcave a condition that is met by most demand distributions commonly used in the inventory literature the results simplify optimization and extend the known optimality of s s and nq r policies to cost structures common in applications and to the presence of typical service constraints as a prerequisite for the study a series of new monotonicity results are derived for compound renewal processes

inflation forecast targeting implementing and monitoring inflation targets abstract inflation targeting is shown to imply inflation forecast targeting the central bank s inflation forecast becomes an explicit intermediate target inflation forecast targeting simplifies both implementation and monitoring of monetary policy the weight on output stabilization determines how quickly the inflation forecast is adjusted towards the inflation target money growth or exchange rate targeting is generally inferior than inflation targeting and leads to higher inflation variability commitment to target rules may be better than commitment to instrument rules

contingent labor contracting under demand and supply uncertainty firms increasingly use contingent labor to flexibly respond to demand in many environments labor supply agencies are growing to fill this need as a result firms and agencies are engaging in long term contracts for labor supply we develop mathematical models of the interaction between firms and labor supply agencies when demand and supply are uncertain we consider two models of labor supply uncertainty termed productivity and availability uncertainty and study how each affects the nature of the contracts formed these models reflect two major roles played by the labor supply agency in the case of productivity uncertainty we find that it is possible to construct a contract that coordinates the firm and agency hiring in an optimal way in contrast we show that in environments characterized by availability uncertainty optimal contracts are not possible however there is a large range of contract parameters for which both parties would benefit from a contract we analyze these and discuss the trade offs that should be considered in contract negotiation

lower bounds for multi echelon stochastic inventory systems we establish lower bounds on the minimum cost of managing certain production distribution networks with setup costs at all stages and stochastic demands these networks include serial assembly and one warehouse multi retailer systems we obtain the bounds through novel cost allocation schemes we evaluate the bounds performance for one warehouse multi retailer systems by comparing them with simple heuristic policies the bounds are quite tight for systems with a small number of retailers we also present simplified proof of known optimality results for serial and assembly systems

the un importance of forward looking behavior in price specifications the seminal work of edmund s phelps 1978 john b taylor 1980 and guillermo a calvo 1983 developed forward looking models of price determination that imparted inertia to the price level these models incorporate expectations of future prices and excess demand by imposing constraints typically lag lead symmetry constraints that force future variables to enter the specification in this paper the author tests the empirical significance of future prices in specifications like those of taylor he finds that expectations of future prices are empirically unimportant in explaining price and inflation behavior however the dynamics of a model that includes a purely backward looking inflation specification differ substantially and not altogether pleasingly from those with a forward looking specification copyright 1997 by ohio state university press

indivisible labor and the business cycle abstract a growth model with shocks to technology is studied labor is indivisible so all variability in hours worked is due to fluctuations in the number employed we find that unlike previous equilibrium models of the business cycle this economy displays large fluctuations in hours worked and relatively small fluctuations in productivity this finding is independent of individuals willingness to substitute leisure across time this and other findings are the result of studying and comparing summary statistics describing this economy an economy with divisible labor and post war u s time series

comments on competitive responsiveness marketing science features many and diverse articles that analyze competitive responsiveness although recent marketing science editorials e g shugan 2002 suggest that competitive responsiveness is only a part of a comprehensive competitive marketing strategy it remains a vital part for that reason and many others marketing science is particularly proud of this special issue edited by david j reibstein and dick r wittink before introducing and vigorously applauding both the editors and authors of this excellent special issue we emphasize that competitive responsiveness raises numerous issues including whether one can forecast outcomes of new policies based on past observations made under old policies i e the lucas critique and decisions regarding which variables should be considered endogenous shugan 2004 i e determined within the model perhaps normative models are inherently perishable evolution in market structure requires modifications over time also although complete consistency within the world of the model is aesthetically pleasing imposing industry specific exogenous constraints that might appear unrelated to the modeling assumptions is sometimes necessary

two step econometric estimation of farm characteristics affecting marketing contract decisions we examine how farm characteristics affect marketing contract decisions we relax the restrictive assumptions of tobit poisson and multinomial logit models and consider the quantity frequency and contract type decisions conditional on rather than jointly with the contract adoption decision in contrast to earlier studies on marketing contract decisions we estimate a two step econometric model using agricultural resource management study data and find that farm characteristics affecting decisions to adopt marketing contracts differ from those affecting decisions regarding quantity frequency and contract type

testing for the lucas critique a quantitative investigation this thesis contains four essays which studies the macroeconomic effects of fiscal and monetary policy quantitatively the first essay investigates whether swedish postwar business cycles have been generated by domestic or foreign shocks and finds that they are about equally important in the second essay the effects of government budget deficits on interest rates in sweden are studied in a small open economy framework the empirical results which have high power due to very large swings in deficits and interest rates provide support that larger deficits produce higher interest rates and thus give support against the ricardian view the third essay seeks to identify optimal social insurance and redistribution levels in sweden and the u s with respect to temporary and permanent idiosyncratic productivity risks the results indicate that sweden should reduce the social security level while the u s should approximately maintain the current level in the last essay the small sample properties of a well known statistical test for the lucas critique the super exogeneity test is studied in a general equilibrium environment the results indicate that the super exogeneity test do not have sufficient power in small samples

optimal control of a divergent multi echelon inventory system consider a divergent multi echelon inventory system such as a distribution system or a production system at every facility in the system orders are placed or production is initiated periodically the order arrives after a fixed lead time at the end of each period linear costs are incurred penalty costs are incurred at the most downstream facilities for back orders the objective is to minimize the expected holding and penalty costs per period we prove that under the balance assumption it is cost optimal to control every facility by an order up to policy the optimal replenishment policy i e the order up to level and the allocation functions at each facility can be determined by system decomposition this decomposition reduces complex multi dimensional control problems to simple one dimensional problems

optimizing the use of contingent labor when demand is uncertain abstract we develop a new model for flexible workforce management in environments with uncertainty in the demand for labor in particular we model a workforce comprised of regular workers who have fixed schedules and may work overtime and contingent workers whose working hours are flexible as specified by a contract over a finite planning horizon our model can represent a variety of contracts including temporary workers on call workers with guaranteed minimum pay and comp time arrangements we formulate the model as an optimization problem that determines the regular and contingent worker pool sizes that minimize expected labor and backlog costs embedded within this problem is a dynamic programming problem of making optimal operational staffing decisions with respect to the utilization of contingent and overtime resources numerical examples demonstrate the effect that the timing of information has on the benefits of flexibility we also derive structural results that may be exploited to reduce the computational effort required to use the model

integrating resource and production decisions in a simple multi stage assembly system we consider a simple multi stage assembly system with stationary stochastic demand for a single final product that is made to stock the assembly tasks are performed by human resources this workforce consists of two parts regular workforce with a long term contract and temporary workforce that are contracted based on the actual demand contracting resources early is always cheaper than contracting later when we separate resource and production decisions we can first determine order up to levels and production decisions in a standard way and afterwards find the best mix of regular and temporary workforce next to this decoupled approach we present an integrated approach where these decisions influence each other in a set of examples we show that the integrated approach can be very beneficial

using cumulative prospect theory to explain anomalous crop insurance coverage choice farmers decisions about how much crop insurance to buy are not generally consistent with expected utility maximization taking into account both marginal risk benefits and marginal subsidy effects suggests that most farmers have chosen lower coverage levels than would be predicted by standard models by modeling financial outcomes as gains and losses cumulative prospect theory offers an alternative framework to perhaps better understand farmers purchase decisions the role of the reference point that defines outcomes as either a gain or a loss the degree of loss aversion curvature of the value function and the probability weighting function in determining optimal crop insurance coverage levels are explored for three representative farms calibrated to 2009 conditions loss aversion and how crop insurance is framed through choice of the reference point are shown to be the key factors that determine whether predictions from prospect theory are consistent with observed crop insurance coverage choices when crop insurance is framed as a tool to manage farm risk then optimal choices under prospect theory are not consistent with observed choices if crop insurance is framed as a stand alone investment where a loss is felt if the indemnity received is less than the premium paid then prospect theory can generate optimal coverage level choices that are largely consistent with observed decisions this result is shown to be robust to changes in parameterizations as long as loss aversion is maintained and if curvature of the value function is accompanied by decision weights that overweight low probability outcomes

optimal policies for multi echelon inventory problems with batch ordering in many production distribution systems materials flow from one stage to another in fixed lot sizes for example a retailer orders a full truckload from a manufacturer to qualify for a quantity discount a factory has a material handling system that moves full containers of parts from one production stage to the next in this paper we derive optimal policies for multi stage serial and assembly systems where materials flow in fixed batches the optimal policies have a simple structure and their parameters can be easily determined this research extends the multi echelon inventory theory in several ways it generalizes the clark scarf model by allowing batch transfers of inventories rosling 1989 shows that assembly systems can be interpreted as serial systems under the assumption that there are no setup costs we show that the series interpretation still holds when materials flow in fixed batches which satisfy a certain regularity condition finally veinott 1965 identifies an optimal policy for a single location inventory system with batch ordering this paper generalizes his result to multi echelon settings

one warehouse multiretailer systems with centralized stock information we consider a distribution system with a central warehouse and multiple retailers the warehouse orders from an outside supplier and replenishes the retailers which in turn satisfy customer demand the retailers are nonidentical and their demand processes are independent compound poisson there are economies of scale in inventory replenishment which is controlled by an echelon stock batch transfer policy for the special case with simple poisson demand we develop an exact method for computing the long run average holding and backorder costs of the system based on this exact method we provide approximations for compound poisson demand numerical examples are used to illustrate the accuracy of the approximations we also present a numerical comparison between the average costs of a heuristic echelon stock policy and an existing lower bound on the average costs of all feasible policies

coordination mechanisms in decentralized serial inventory systems with batch ordering this paper studies a periodic review serial supply chain in which materials are ordered and shipped according to r nq policies three information scenarios are considered depending on the level of information available echelon local and quasilocal in the echelon scenario each stage can access the inventory and cost information within its echelon comprising the stage itself and all downstream stages in the local scenario each stage only accesses its own local information finally in the quasilocal scenario each stage knows its local information plus the actual customer demands we propose coordination schemes that regulate the stages to achieve the supply chain s optimal cost under each information setting all these coordination schemes fit comfortably within an emerging practice called supply chain finance which includes the organization and technology needed to implement them

futures hedging under price basis and production risk we consider the hedging problem of a firm that has three sources of risk price basis and yield uncertainty an exact solution for the optimal futures hedge is derived under the assumption that the three random variables are jointly normally distributed and that utility is of the cara type unlike the mean variance approximation applied in previous research we show that the optimal hedge does depend on risk attitudes even when the agent perceives the futures price as being unbiased the theoretical results are applied empirically to the problem of hedging soybean production in iowa the exact solution relying on cara and normality is compared with numerical solutions under lognormal distributions and crra utility

the impact of a product harm crisis on marketing effectiveness product harm crises are among a firm s worst nightmares a firm may experience i a loss in baseline sales ii a reduced own effectiveness for its marketing instruments iii an increased cross sensitivity to rival firms marketing mix activities and iv a decreased cross impact of its marketing mix instruments on the sales of competing unaffected brands we find that this quadruple jeopardy materialized in a case study of an australian product harm crisis faced by kraft peanut butter we arrive at this conclusion by using a time varying error correction model that quantifies the consequences of this crisis on base sales and on own and cross brand short and long term effectiveness the proposed modeling approach allows managers to make more informed decisions on how to regain the brands pre crisis performance levels

profit margin hedging some extension economists and others recommend profit margin hedging as a way to choose the timing of crop sales however the theory behind this strategy recommendation is not well developed this article determines the producer s utility function and price processes where profit margin hedging is optimal profit margin hedging is shown to be an optimal strategy under a highly restricted target utility function even in an efficient market profit margin hedging is profitable if prices are mean reverting copyright 2010 oxford university press

the lucas critique and the stability of empirical models this paper re considers the empirical relevance of the lucas critique using a dsge sticky price model in which a weak central bank response to inflation generates equilibrium indeterminacy the model is calibrated on the magnitude of the historical shift in the federal reserve s policy rule and is capable of generating the decline in the volatility of inflation and real activity observed in u s data using monte carlo simulations and a backward looking model of aggregate supply and demand we show that shifts in the policy rule induce breaks in both the reduced form coefficients and the reduced form error variances the statistics of popular parameter stability tests are shown to have low power if such heteroskedasticity is neglected in contrast when the instability of the reduced form error variances is accounted for the lucas critique is found to be empirically relevant for both artificial and actual data

coordinating inventory control and pricing strategies under batch ordering in this paper we investigate joint pricing and inventory control problems in a finite horizon single product periodic review setting with certain uncertain supply capacities the demands in different periods are random variables whose distributions depend on the posted price exhibiting the additive form the order quantity in each period is required to be of integral multiples of a given specific batch size denoted by q inventory replenishment incurs a linear ordering cost referred to as the cost rate function the sum of holding and backorder costs can either be convex or quasi convex the objective is to determine a joint ordering and pricing decision that can maximize the total expected profit over the planning horizon we first consider the case in which the cost rate function is convex and show that the modifiedr q list price policy is optimal for the system with certain and limited capacities a special case of which is the r q list price policy when capacities become unlimited as supply capacities become random the optimal policy follows a new structure wherein the optimal order up to level and posted price must be coordinated to make the optimal safety stock level follow the r q policy we further consider the case of a quasi convex cost rate function which may arise when a service level constraint is used as a surrogate for the shortage cost we demonstrate that the r q list price policy is optimal for the system without supply capacity constraints in addition extensions to several other models are discussed the enabling technique is based on the notion of q jump convexity and its variants

bardsen gunnar eitrheim oyvind jansen eilev s and nymoen ragnar the econometrics of macroeconomic modelling

formation and adaptation of reference prices in grain marketing an experimental study this study aimed to explore how producers reference prices are formed and adapt over time and how they affect marketing decisions results indicate that producers focus on three major variables to form their reference prices the current market price the highest price to date and their expectation about price behavior further they update their reference prices during the marketing season mainly in response to changes in current market prices their own expectations about price behavior and the general price trend finally our findings suggest that producers marketing decisions are based on the spread between current market price and reference price the general market trend and price expectation

ricardian equivalence and lucas critique an alternative test of ricardian equivalence using super exogeneity tests in simulated series this article considers an alternative methodology nested on super exogeneity tests to verify the occurrence of ricardian quivalence the advantage of this new procedure is based on the intuitive appeal and the statistical procedure more appropriated than the econometric techniques previously adopted in this literature

mistake 37 the effect of previously encountered prices on current housing demand based on contrast effects studies from psychology we predicted that movers arriving from more expensive cities would rent pricier apartments than those arriving from cheaper cities we also predicted that as people stayed in their new city they would get used to the new prices and would readjust their housing expenditures countering the initial impact of previous prices we found support for both predictions in a sample of 928 movers from the psid alternative explanations based on unobserved wealth and taste and on imperfect information are ruled out

hedgers funds and small speculators in the energy futures markets an analysis of the cftc s commitments of traders reports the commodity futures trading commission cftc s commitments of traders cot data are examined for crude oil unleaded gasoline heating oil and natural gas futures contracts the collection procedures for the cot data are first examined followed by granger causality tests to determine if relationships between trader positions and market prices exist a positive correlation between returns and positions held by noncommercial traders and a negative correlation between commercial positions and market returns are found furthermore positive returns result in an increase in noncommercial net positions in the following week whereas the net long positions held by commercial hedgers decline following price increases however traders net positions do not lead market returns in general

assessing the lucas critique in monetary policy models empirical estimates of monetary policy rules suggest that the behavior of u s monetary policymakers changed during the past few decades however for that same time period statistical analyses of lagged representations of the economy such as vars often have not rejected the null of structural stability these two sets of empirical results appear to contradict the lucas critique this paper reconciles these results with the lucas critique by showing that the apparent policy invariance of reduced forms is consistent with the magnitude of historical policy shifts and the relative insensitivity of the reduced forms of plausible forward looking macroeconomic specifications to policy shifts