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Idéalement, le niveau de texte pigouvienne qui frappe une activité source d'externalités doit êtreA) de l'écart entre le coût social est le coût privé de cette activitéB) égal au coût social de cette activitéC) dans montant suffisant pour que cesse l'externalitéD) d'un montant inférieur au coût privé de cette activité

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