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Asymmetry tests have been used by agricultural economists to determine if the effects of price changes in one region or level in the marketing channel are transmitted to other regions or levels in the marketing channel in an identical manner for price increases and decreases. Two tests are normally conducted: sum of coefficients tests and speed of adjustment tests. In this analysis, these two tests are conducted on weekly price response equations that relate Alberta and Ontario price changes. Six separate periods of analysis are used to reflect institutional changes in the Alberta market. Evidence of asymmetrical price response is detected for the period immediately preceding the establishment of the Alberta Pork Producers Marketing Board. Les spécialistes en économie rurale vérifient i'asymétrie des prix pour voir si la fluctuation des cours dans une région ou un élément du circuit se transmet aux autres régions ou éléments de la même façon pour les hausses et les baisses de prix. On effectue habituellement deux épreuves: (1) somme des résultats des épreuves sur les coefficients et (2) vérification de la rapidité d'ajustement. Les auteurs ont appliqué ces deux épreuves aux équations qui mesurent la réaction des prix hebdomadaires et relient les fluctuations des prix entre l'Ontario et l'Alberta. lis se sont servis de six périodes d'analyse distinctes pour tenir compte des changements institutionnels survenus sur le marché albertain. Les résultats indiquent une réaction asymétrique des prix pour la période qui a immédiatement précédé la création de l'Office de commercialisation des producteurs de pores de l'Alberta.

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Problems that have emerged from the ongoing highland development schemes in northern Thailand indicate the need for better understanding of resource management issues in the region. Particular attention has been paid to land and water management. An integrated modelling system has been developed to address this issue based on a multidisciplinary approach. The components of the system include a crop simulation model, a hydrological model and a set of linear programming models. The modelling system enables users to simulate farmers' decision making process concerning farmland and water resource management. Conditions for farmers' decisions are adjusted seasonally and annually, by an embedded feedback mechanism, according to the simulated biophysical (water availability and the associated crop yield) and socioeconomic environments. Users are then capable of exploring the dynamics of land and water use options at the catchment and sub-catchment level. Such capability will enable them to look at resource management problems from both biophysical and socioeconomic perspectives and then make more informed decisions in planning future development schemes. The paper also presents preliminary results from calibrating the system against an existing scenario in one of our focused sub-catchment.