Le multiplicateur à secteurs multiples et le circuit économique

[eng] Economie interrelations and equilibrium can be expressed through the multisectorial multiplier technique which is generalisation of Leontiefs structural analysis The economic system may be devided into sectors caracterised by their marginal propensity to consume the reaction lags of each sectors being different. In such conditions any new expenditure injection leads gener ly to stable situation. It appears also that the notion of equilibrium can only be reached in the frame of dynamical analysis and one is veering gradually form macro-economic full equilibrium to micro-economic general equilibrium There exists in fact for each problem and each type of eco nomic system an optimum degree of dissection But this method is linked with monetary point of view and necessitates study at the same time of quantity and price problems Moreover the dynamisation of the model in imperfect as long as investment expenditures are brought in only as external injections. In both cases progress is beeing made but not yet entirely satisfactory.