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L'efficience Informationnelle faible des Marchés Boursiers Africains

Authors: Salma DIB; Nabil DAHHOU; Omar KHARBOUCH;

L'efficience Informationnelle faible des Marchés Boursiers Africains

Abstract

Afin d’étudier la capacité de rendement des marchés des pays africains, il faut procéder à l’analyse des rendements quotidiens des indices boursiers. Pour une période de six ans, et en s’appuyant sur quatre types de tests à savoir : Les tests d’autocorrélation, les Runs tests, les tests de racine unitaire et les tests de normalité, les résultats obtenus pour un nombre d’observations de 1674 jours (du03/04/2013 au 18/12/2020) ont indiqués et signalés une production mixte pour différents indices. En revanche, et au niveau du sens faible de l’efficience, les séries des rendements des marchés africains indiquent l’absence d’efficience du marché. Dans l’ensemble, il est déduit que dans les pays de l’Afrique, les rendements quotidiens des indices boursiers ne suivent pas une marche au hasard (marche aléatoire) ; Alors qu’il est conclu qu’en raison de l’inefficience du marché, les initiés peuvent obtenir des flux de bénéfices d’arbitrages. Dans un autre point de vue, la conception de l’efficience désigne le pied -droit de la théorie de la finance moderne ; Du coup, on ne peut confirmer l’existence d’efficience dans un marché que s’il déchiffre et manifeste toute l’information disponible et traduite par chaque actif financier ; En d’autres termes, la présence de l’efficience exprime la capacité du marché à reconstituer son équilibre et sa persistance tout en permettant une meilleure allocation des ressources aux investisseurs. C’est dans l’intérêt d’expliquer le doute de la rapidité d’informations reflétées dans chaque cours boursier que FAMA (1970) a procédé à la décortication de l’efficience en trois sous-formes à savoir : la forme faible de l’efficience, la forme semi-forte et finalement la forme forte.

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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