agricultural price instability a survey of competing explanations and remedies there are two explanations for agricultural price dynamics one follows cobweb logic and models fluctuations driven by expectation errors but emphasises that these expectations create complex dynamics and possibly chaos the other stems from the rational expectations tradition of dynamics driven by real shocks the empirical evidence tends to support the latter but is not conclusive the rational expectations model generates an optimal dynamic path from which no improvement can be expected from public intervention however if we take account of all the potential market failures in agricultural markets and especially in developing countries this conclusion might require some qualifications although an appropriate policy design for stability has still to be achieved this paper surveys the positive and normative literature on agricultural prices highlighting empirical evidence and identifying remaining unresolved issues

econometric developments in agricultural and resource economics the first 100 years this article reviews the major contributions of agricultural and resource economists in the area of econometrics over the past 100 years early on a number of agricultural economists were in on the ground floor in terms of developing new econometric methods over time as the economics profession became more empirically oriented agricultural and resource economists increasingly assumed the role of early adopters of new econometric methods even so agricultural and resource economists continue to make useful modifications to econometric techniques in order to adapt the methods to the unique nature of the problems and applications that we study

modelling the link between commodity prices and exchange rates the tale of daily data this paper examines daily data on exchange rates and the prices of three commodities traded on the winnipeg commodity exchange the temporal patterns of commodity prices and exchange rates are shown to be similar daily data are significantly non normal with garch models capturing the processes generating the data commodity prices and exchange rates are examined for cointegration using recent tests proposed by johansen and juselius 1990 currency depreciation is shown to granger cause commodity price inflation this information might be useful to central bankers concerned with reducing general price inflation through targeting commodity price inflation it also suggests that macro events have important effects on commodity markets in canada

hedonic price indexes for spreadsheets and an empirical test for network externalities in this article i first estimate hedonic price equations for computer spreadsheet programs and then use the analysis to empirically test whether network externalities exist in this industry the study shows that consumers are willing to pay a significant premium for spreadsheets that are compatible with the lotus platform and for spreadsheets that offer links to external databases and a similar premium for spreadsheets that offer local area network externalities finally the quality adjusted real price of computer spreadsheets declined by approximately 15 per year from 1986 to 1991

platform competition in two sided markets many if not most markets with network externalities are two sided to succeed platforms in industries such as software portals and media payment systems and the internet must get both sides of the market on board accordingly platforms devote much attention to their business model that is to how they court each side while making money overall this paper builds a model of platform competition with two sided markets it unveils the determinants of price allocation and end user surplus for different governance structures profit maximizing platforms and not for profit joint undertakings and compares the outcomes with those under an integrated monopolist and a ramsey planner jel l5 l82 l86 l96

advertising as information an empirical note lamm r mcfall unionism and prices in the food retailing industry journal of labor research 3 winter 1982 69 79 marion bruce w willard f mueller ronald w cotterill frederick e geithman and john r schmelzer the food retailing industrv market structure profits and prices new york praeger 1979a the price and profit performance of leading food chains a merican journal of a gricultural economics 61 aug 1979b 420 433 salinger michael a tobin s q unionization and the concentration profits relationship rand journal of economics 15 summer 1984 159 170 voos paula b and lawrence r mishel the union impact on profits evidence from the supermarket industry working paper no 88 north central project 117 university of wisconsin madison oct 1985 the union impact on profits evidence from industry price cost margin data journal of labor economics 4 jan 1986 105 133

network effects software provision and standardization in this paper we examine the software provision decision of software firms the provision decision by software firms determines the value and hence the market share of competing hardware technologies we show how the provision decision by software firms determines whether multiple hardware technologies are supported in equilibrium or whether there is de facto standardization with only one hardware technology supplied with software in equilibrium we show that when consumers place a high value on software variety there is a suboptimal amount of standardization by the market

taxing foreign profits with international mergers and acquisitions a large part of border crossing investment takes the form of international mergers and acquisitions in this article we ask how optimal repatriation tax systems look like in a world where investment involves a change of ownership instead of a reallocation of real capital we find that the standard results of international taxation do not carry over to the case of international mergers and acquisitions the deduction system is no longer optimal from a national perspective and the foreign tax credit system fails to ensure global optimality the tax exemption system is optimal if ownership advantage is a public good within the multinational firm however the cross border cash flow tax system dominates the exemption system in terms of optimality properties

monetary policy shocks and the dynamics of agricultural commodity prices evidence from structural and factor augmented var analyses fluctuation in commodity prices is a significant and timely issue to be studied this study is to examine the impact of monetary policy and other macroeconomic shocks on the dynamics of agricultural commodity prices the major contributions of this study are twofold first unlike other studies that use indexes this study analyzes the commodities individually affording the inclusion of commodity specific fundamentals such as the level of inventory an important determinant of commodity price in a structural var framework second it exploits a rich data set of agricultural commodity prices which includes commodities that are usually overlooked in the literature and extracts a common factor using the dynamic factor model to understand the extent of comovement of the prices and to gauge the extent to which macroeconomic shocks drive the comovement in a factor augmented var favar framework the findings show that monetary policy global economic conditions and the u s dollar exchange rates play an important role in the dynamics of agricultural commodity prices

aggregate sources of relative price variability among agricultural commodities a measure of relative price variability among forty seven agricultural commodities is developed for the period 1962 to 1987 econometric models are used to explore the effects of macroeconomic instability on relative price variability within the agricultural sector the results show that these relative prices are more variable when actual and unanticipated inflation rates are higher they may also be more variable during periods when real shocks to the macroeconomy are relatively large thus monetary and fiscal events are not neutral with respect to the agricultural sector because macroeconomic instability appears to create instability and increased uncertainty in agricultural markets

advertising as information further evidence in the past 30 years the economics of information has become an important feature of the revolution in modern microeconomic theory the seminal literature includes theoretical advances by stigler 10 nelson 7 8 spence 9 and darby and karni 1 in an original approach laband 3 tests the proposition that the supply of product quality signals increases with a rise in the expected marginal return to consumers utilizing yellow pages advertisements in various urban settings in later expositions laband 4 5 provides further evidence of the durability of the informational content and the differences in information provision of television and commercial advertisements for different types of goods the present paper extends and provides alternatives to laband s tests of the impact of time costs faced by consumers on the informational content of advertising this study employs a supplementary category to laband s of credence goods developed in the literature 2 6 and analyzes the impact of income as a proxy for time and information costs with a unique intra city data set from new york city and los angeles

atheoretical macroeconometrics a critique abstract the spurious nature of the restrictions used to identify many macroeconometric models has led some researchers to advocate a style of econometric inquiry that is less dependent on prior theoretical restrictions of the sort that were central to the approach of the cowles commission this development which we call atheoretical macroeconometrics is summarized and evaluated in the current paper it is contrasted with an updated version of the cowles commission approach we conclude that while some of the exercises of atheoretical macroeconometrics are valid those that have attracted the most attention and appear the most innovative exogeneity testing impulse response analysis and policy analysis using estimated vector autoregressions are based on incorrect analysis

identifying monetary impacts on agricultural prices in var models since the mid 1970s a number of studies have used vector autoregressive var models to evaluate the magnitude and timing of macroeconomic impacts on agriculture use of the var method has been viewed as a way to obtain empirical evidence about these impacts that might not emerge from more traditional overidentified and less dynamic econometric models the hope has been that by placing minimal restrictions on var models the true structure of the economic relationships under investigation can be observed while the aim is laudable critics of var models have argued that it has had the unfortunate consequence of obscuring some important structural identification issues and seeming to promise that something can be obtained for nothing cooley and leroy leamer they point out that identifying restrictions are required to give economically interpretable meaning to the results of any simultaneous equation model sem in standard practice identification of var models is obtained implicitly by choice of a choleski decomposition of the covariance matrix of one step ahead forecast errors which is equivalent to imposing a recursive structure for the economy of concern is that the recursive structure may not be believable further as bernanke has observed examination of ad hoc variants of the recursive order implies a strange set of prior beliefs in which the analyst holds strongly that the system is recursive but is not sure in what order the variables should be arranged in response to these concerns several recent papers have pointed out that identification of var models does not have to rely on the assumption that the contemporaneous structure is recursive bernanke sims rather the distinguishing features of a var model are first that identification rests on the assumption that distinct mutually orthogonal behavior shocks drive the economy and second that lagged relationships among the endogenous and exogenous variables if any are left entirely unrestricted given these features a var model must be identified solely by restrictions placed on the contemporaneous interactions among the variables but the identifying restrictions do not have to preclude simultaneity in this paper we elaborate on the structural interpretation of var models and use this analysis to examine monetary impacts on agricultural prices we discuss the identification problem and the implications of a recursive structure we illustrate our points with respect to the three variable model of money industrial prices and agricultural prices that has been used in several articles to evaluate the effects of monetary shocks on price dynamics bessler devadoss and meyers we then introduce a somewhat richer behavioral model of the macroeconomy and its effects a simultaneous model is shown to offer a more believable identification of monetary policy and other macroeconomic shocks than a recursive model and monetary impacts on agricultural prices are assessed

a cointegration analysis of canadian wood pulp prices the effects of the canada u s exchange rate the u s pulp price and the domestic use of pulp on the canadian pulp price are investigated using a cointegration analysis results suggest that the u s pulp price is more important than other variables in determining the price of pulp in canada the incomplete pass through of the exchange rate indicates that canadian pulp producers may not have market power to increase their price of pulp the temporary increase in the price of canadian pulp in response to a devaluation of the canadian dollar may be due to short term contracts which canadian pulp producers have with their importers

network externality an uncommon tragedy economists have defined network externality and have examined putative inframarginal market failures associated with it this paper distinguishes between network effects and network externalities where the latter are market failures the authors argue that while network effects are important network externalities are theoretically fragile and empirically undocumented some network externalities are merely pecuniary network ownership or transactions among network participants can internalize some network effects the type of market failure that has been associated with these externalities is a transition problem that has little to do with externality

long run identifying restrictions for an error correction model of new zealand money prices and output abstract dynamic interactions among money prices and output are modeled for new zealand we find evidence of one cointegrating relationship and two stochastic trends among these series and base structural inferences on long run identifying restrictions of the type proposed for vec models by king plosser stock and watson kpsw under the assumption that a monetary shock has no effect on output in the long run a productivity shock for which there is partial monetary accommodation explains most of the variability of output at all forecast horizons whereas the monetary shock is the most important determinant of levels of money and prices an alternative identifying restriction that imposes a long run impact of a monetary shock on output results in less plausible dynamic effects

competition between networks a study of the market for yellow pages this paper estimates the importance of network effects in the market for yellow pages i estimate three simultaneous equations consumer demand for usage of a directory advertiser demand for advertising and a publisher s first order condition derived from profit maximizing behaviour estimation shows that advertisers value consumer usage and that consumers value advertising implying a network effect i find that internalizing network effects would significantly increase surplus as an application i consider whether the market benefits from monopoly which takes advantage of network effects or oligopoly which reduces market power i find that a more competitive market is preferable copyright 2004 wiley blackwell

the dynamic responses of crop and livestock prices to money supply shocks a bayesian analysis using long run identifying restrictions the impact of monetary policy on agriculture has been much debated this study examines the dynamic responses of u s agricultural prices to money supply shocks using three innovations first the variables responses are identified by long run money neutrality restrictions instead of the more common contemporaneous ordering second a bayesian approach to model uncertainty is used to add robustness to the estimation process third agricultural prices are disaggregated into crop and livestock components the empirical results find that both agricultural sectors benefit in the short run from positive money supply shocks with agricultural prices increasing relative to the general price level

did installed base give an incumbent any measurable advantages in federal computer procurement this research examines the relative strength and significance of the status of incumbent contractor in federal computer procurement one finding as expected is that an agency is likely to acquire a system from an incumbent vendor another finding perhaps more interesting is that the in compatibility between a buyer s installed base and a potential system also influences the vendor choice a result that may be the first econometric measurement of the competitive effects of incompatibility an illustration of this thesis comes from ibm s experience new evidence shows however that ibm s apparent disadvantage with government agencies is largely due to incompatibilities in ibm s product line

a roller coaster ride an empirical investigation of the main drivers of the international wheat price over the last decade commodity prices have registered substantial booms and busts marked by extreme volatility wheat in particular one of the main nonoil commodities has registered a roller coaster in price levels which seems to be inconsistent with supply and demand fundamentals to acutely investigate the drivers of wheat prices and quantify their impact a vector error correction model vecm has been used the exogenous variables have been distinguished into four groups market specific factors broad macroeconomic determinants speculative components and weather variables the quadriangulation of the determinants will enable us to better understand the movements in wheat price and identify the specific role of each component the results show that a mix of factors are contributing to wheat price movements including speculation global demand and real effective exchange rate

the effects of macroeconomic factors on south african agriculture significant research efforts have been devoted to understanding the effects of macroeconomic factors on the agriculture sector analysing the sources of volatility in the industry is critical for designing appropriate policies to stabilize agricultural markets reduce poverty and increase economic growth agriculture is a competitive sector with prices that are more flexible than those in nonagricultural sectors this article uses annual data over the 1957 2004 period and a vector error correction model in investigating the dynamic effects of exchange rates money supply and other macroeconomic variables on the agricultural sector in south africa overall real exchange rates interest rates inflation and money supply m3 shocks have significant and persistent impacts on agricultural output prices received by farmers and farm input prices m3 and interest rate shocks tend to put agriculture in a cost price squeeze agricultural price movements are a source of macroeconomic instability in the country r

network effects without network externalities abstract the network externalities hypothesis postulates that consumers prefer to purchase brands which are bought by more consumers compared with brands with a low market share in this paper we show that increasing returns to scale in the production of complementary products can substitute for the network externalities assumption we develop a model for the computer industry in which the production of complementary software requires a large fixed cost of development relative to the cost of duplicating and marketing the software the increasing returns to scale in the production of software yields consumers behavior which is very similar to consumers who have preferences exhibiting network externalities

effects of international shocks and domestic macroeconomic policies upon brazilian agriculture abstract an identified vector autoregressive model is used to analyze the transmission of external commodity shocks to the brazilian economy the effects of the interaction between domestic macroeconomic monetary and exchange rate policies and external shocks to agricultural commodity raw material and food prices and crude oil price upon domestic agriculture industry terms of trade are estimated

relative prices and money a vector autoregression on brazilian data recent data on brazilian agricultural prices industrial prices and money supply are analyzed in a vector autoregression the empirical findings show strong one way granger type causality from money supply to agricultural prices while feedback is observed between industrial prices and money supply under the usual monetarist ordering of contemporaneous innovation covariance agricultural prices do not adjust faster than industrial prices to a shock in the money supply

commodity price dynamics and anticipated shocks in this paper we address the robustness of overshooting hypothesis in agricultural prices we find that agricultural prices may undershoot their long run level if the economy experiences an anticipated monetary shock rather than an unanticipated monetary shock we also find that agricultural prices definitely display undershooting if the price of manufactures adjusts instantaneously rather than sluggishly

macroeconomics and agriculture in tunisia this article aims to analyse the impact of changes in the monetary policy and the exchange rate on agricultural supply prices and exports the methodology used is based on the multivariate cointegration approach ten variables are considered interest and exchange rates money supply inflation agricultural output and input prices agricultural supply and exports income and the rate of commercial openness the sample period covers annual data from 1967 to 2002 due to the short sample period two subsystems are considered first long run relationships are identified in each subsystem second both subsystems are merged in order to calculate the short run dynamics the results indicate that changes in macroeconomic variables have an effect on the agricultural sector but the reverse effect does not hold

macroeconomic impacts on bulgarian agriculture during transition an unstable and erratic macroeconomy in an economy in transition might be expected to affect agricultural performance this is tested for bulgaria between 1992 and 1997 using impulse response functions from a vector autoregressive var model despite data limitations it is found that shocks to the foreign exchange rate and interest rate feed into farm prices and agricultural exports but equilibrium will be re established within 5 years agricultural policies may not be sufficient to counteract the wider macroeconomic forces

relative prices and money further results for the united states empirical results support the hypothesis that agricultural prices respond faster than manufactured product prices to a change in money supply in the united states sims vector autoregression var technique was applied in examining this hypothesis the monte carlo integration method was used to test the significance of the impulse responses generated by the var technique

systems competition and network effects this paper discusses firm behavior market performance and the public and private institutions that arise in systems markets i e markets where consumers use compatible components together to generate benefits in such markets which include communications networks and hardware software networks popular products are inherently more valuable these network effects can drive corporate strategies and are critical in understanding innovation in many high technology markets the discussion here emphasizes the dynamics of consumer adoption decisions in the presence of network effects competition between incompatible systems and how suppliers choose which components are compatible and which are not