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Afin qu'au nom de la courbe en J, la perte de la valeur d'une monnaie puisse, dans un certain court terme, aboutir à un excédent commercial, certaines conditions doivent être respectées. Voici les principales conditions d'application de la courbe en J : ▪ La condition de Marshall-Lerner appelée aussi le théorème des élasticités critiques. Pour que le taux de change ait un effet positif sur la balance commerciale la somme des élasticités-prix des importations et exportations en valeur absolue doit être supérieure à 1. ▪ Il est indispensable qu'une production nationale puisse se substituer aux productions extérieures. ▪ Disposer d'un appareil productif suffisamment performant pour pouvoir répondre à l'accroissement des exportations. ▪ Il est nécessaire aussi que les intermédiaires répercutent l'effet de la dévaluation sur les prix.

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