A regional input-output model, detailing agriculture and its ancillary sectors, is used to quantify the effects of a BSE-induced reduction in final demand for beef on the economy of Northern Ireland, a region with heavy dependence on beef exports. The long-run regional output, income and employment effects are estimated assuming no market stabilization measures and taking account of substitution effects in final demand. Predicted net losses in regional income are 0.5% of regional GDP with job losses of up to 0.6% of regional employment. About 77% of the income losses and 87% of the job losses are in the beef sector, primarily beef production. Compensating gains due to demand substitution effects occur mainly in meat processing sectors, other than beef, and are relatively small. Adverse intra-regional distributional effects are likely due to the concentration of beef production in the more disadvantaged areas. The importance of appropriate policy responses is highlighted.

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The increasing scale of direct government intervention in money flows raises questions about the changing structure of Canada's space economy. Estimates of intersectoral and interprovincial money flows provide a basis for assessing the changing impact of govenment‐directed flows in final demand expenditure, in personal income composition, and in explaining the pattern of discordance between the production and consumption modes of provincial economies. Inferences are made also about the relevance of dominance rankings of urban centres controlling revenue flows in Canada's economic‐geographic system. L'échelle croissante d'intervention directe du gouvernement dans les flux de l'argent soulbve des questions au sujet du changement de structure de l'économie spatiale du Canada. Les estimations des flux d'argent intersectoriels et interprovincaux donnent une base pour évaluer le changement d'impact des écoulements dirigés par le gouvernement vers les utilisateurs finals, la composition du revenus personnel, et par l'explication de l'echantillonage de dtsaccords entre les modes de production et de consommation des tconomies provinciaizs. Des interventions sont faites Cgalement au sujet de la pertinence des classements dominants des centres urbains par le contr6le des flux de revenus dans le systkme Ccono‐ghgraphique du Canada.

Underlying much of location theory is a presumption that the costs and revenues of enterprise vary from place to place. Such variations describe spatial cost and revenue surfaces to which locational decisions may be referenced. Changes in Ontario Hydro's pricing practices between 1906 and 1981 illustrate the substantial impact of policy on three major sources of spatial variation in costs. In consequence, it appears that locational decisions are increasingly referenced to artificial, policy‐distorted cost surfaces. Prospects of achieving a spatially efficient configuration of economic activity appear to be severely compromised. La «théorie d'emplacement » se fonde sur la présomption que les dépenses et les revenus d'une enterprise varient selon l'endroit ou elle est située. Le choix de l'emplacement d'un project est affecté par ces variations de couts d'espace et de possibilités de revenus. Les changements dans les practiques des prix d'hydro Ontario entre 1906 et 1981 illustrent les impacts considerables de cette politique sur trois sources principales de variations des couts. Il semble cependant que les décisions basées sur la «théorie d'emplacement » soient faussées d'autant plus que les couts se révélent irrealistes. Base sur cette théorie les chances de parvenir a une situation économique optimale apparaissent être sévérement compromises.