“1.Indique dans quelle mesure le rendement d’une action suit l’évolution du marché. Il mesure la sensibilité, du cours de cette action aux fluctuations du marché et traduit le risque systématique de l’action.
2. Le bêta d’un portefeuille est la moyenne pondérée des bêtas des actions individuelles contenues dans le portefeuille.”
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