Exam (elaborations)
Exercice corrigé - Principes de Microéconomie - Le consommateur 2
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Cas pratique corrigé de Microéconomie - Licence 1, Niveau 1. Corrigé de sujet d'examen.
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Cas pratique – Principes de MicroéconomieLe consommateur 2
NB : ce cas pratique nécessite de maîtriser les notions étudiées dans le Cas pratique de
Microéconomie – Le consommateur 1.
Deux combinaisons de biens X et Y qui se situeraient sur la même courbe d’indifférence
apporteraient toutes deux le même niveau d’utilité (de satisfaction) au consommateur.
On suppose que le consommateur sature son budget, c’est-à-dire qu’il consacre la totalité de son
revenu à sa consommation. Soient respectivement 𝑄𝑋 et 𝑄𝑌 les quantités de biens X et Y. Nous
pouvons donc en déduire l’équation de la droite de budget (contrainte budgétaire) :
𝑅 = 𝑃𝑋 ∙ 𝑄𝑋 + 𝑃𝑌 ∙ 𝑄𝑌
42 = 3𝑄𝑋 + 7𝑃𝑌
𝑃 3
La pente de la droite de budget est donc égale à : − 𝑃𝑋 = − 7
𝑌
Faisons la représentation graphique de la contrainte budgétaire :
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