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Un groupe A d'individus a bénéficié d'une augmentation annuelle de son revenu de 10%. Le revenu du groupe B n'a augmenté que de 5%.On observe que, durant la même période, la quantité de CD achetés par le groupe A a augmenté de 10% tandis que le groupe B n'a pas changé ses achats de CD.Vous pouvez donc affirmer :a.l'élasticité revenu de la demande de disque est égale à 0,5 pour le groupe Ab.le disque est un bien inférieur pour le groupe Bc.l'ensemble de la population considère le disque comme un bien inférieurd.l'élasticité revenu de la demande de disque est égale à 1 pour le groupe A et 0 pour le groupe BFeedback

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