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Les pays de la zone sont donc perdants face à la situation de véritable libre-échange car ils se spécialisent là où n'est pas leur véritable avantage comparatif. Par la mise en place d'un tarif extérieur commun, les Zones d'Intégration Régionale brouillent donc les avantages comparatifs. Viner admet que la zone de libre-échange à l'intérieur de la zone permet tout de même de révéler de la même manière les avantages comparatifs internes or selon lui la destruction d'échange est supérieure à la création de nouveaux flux. L'union douanière est alors considérée comme un « optimum de second rang », faute de pouvoir adopter un optimum de premier rang, le libre-échange généralisé.

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