, N étant fixe, les prix devront s'ajuster pour que la condition d'équilibre soit vérifiée. Sinon, les rigidités pourront entraîner un ajustement réel, c'est-à-dire du PIB et de l'emploi

, Dans un système de change flexible, les variations de N permettront la réalisation de la condition

, Au final, le travail théorique (et empirique) réalisé par J.L. Stein, quoique déjà très élaboré, ouvre des perspectives intéressantes pour des recherches futures

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