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FISCAL FEDERALISM IN A MODEL OF OPITIMUM CURRENCY AREAIn this paper, we build a simple stochastic general equilibrium model based on the theory of optimum currency areas. This allows us to investigate the stabilizing and redistributive effects of fiscal federalism in a currency union. It is shown that GDP-based rules induce important stabilizing effects while unemployment-based rules generally destabilize economic activity. Nevertheless, we show that the last ones can be adjusted to induce some stabilization while minimizing undesirable redistributive effects. Classification JEL: D58, F22, F41, F47 * CADRE, Universite de Lille II et SES, ministere de la Region wallonne. 519