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Numéro 131 - Mars 2017

La finance comportementale : enjeux et perspectives

RE131On peut lire dans le dernier rapport annuel de la Banque nationale de Belgique que, en dépit de l’environnement de taux d’intérêt bas (voire négatifs), les ménages belges continuent de donner la préférence à l’épargne sous la forme d’actifs liquides comme les comptes d’épargne, ou d’actifs à long terme mais peu risqués comme les produits d’assurance avec capital garanti. Ce comportement est difficile à comprendre au regard de la théorie financière classique qui considère l’individu comme un agent économique rationnel cherchant notamment à maximiser sa richesse tout en limitant son risque. C’est ici que la finance comportementale peut jouer un rôle pour nous aider à mieux comprendre l’influence des facteurs cognitifs et émotionnels dans la prise de décision des investisseurs.

La finance comportementale a mis au jour l’existence de nombreux biais comportementaux qui suivent souvent les mêmes schémas chez les individus. Les origines de ces biais sont multiples : le recours à des heuristiques, la sur-confiance et les mécanismes liés à l’estime de soi, les émotions et la maîtrise de soi, ou encore les interactions sociales. Ces différents phénomènes amènent parfois l’individu à poser des choix non rationnels. Cette propension est particulièrement présente chez l’investisseur à cause des caractéristiques des décisions auxquels il est confronté. En effet, ces décisions impliquent souvent des instruments financiers complexes par nature ainsi qu’un arbitrage entre le présent et le futur. De plus, les décisions financières nécessitent fréquemment de pouvoir évaluer le risque inhérent à celles-ci. Enfin, s’ajoute le fait que certaines décisions financières sont tellement peu fréquentes qu’elles ne permettent pas à l’individu de tirer les leçons de ses erreurs passées. 

Les biais comportementaux les plus susceptibles de conduire l’investisseur à une gestion sous-optimale de son portefeuille d’actifs sont le biais de représentativité qui peut se manifester par une tendance à acheter les titres dont les prix augmentent, le biais de disponibilité qui peut amener l’investisseur à surestimer la probabilité d’une prochaine crise, le biais de familiarité qui le pousse à privilégier les titres qui lui sont les plus familiers, le biais de disposition qui amène l’investisseur à réaliser ses plus-values trop rapidement et à ne pas couper ses pertes assez vite, le biais de sur-confiance qui le pousse à traiter des volumes importants et trop fréquemment. Ces exemples révèlent à quel point le comportement des investisseurs, qu’ils soient individuels ou professionnels, est influencé par un mélange complexe d’heuristiques et d’émotions, qui peut lui-même être affecté par certains facteurs individuels et collectifs.

La littérature en finance comportementale regorge aujourd’hui d’articles scientifiques démontrant l’existence de ces biais ainsi que leur caractère systématique et donc souvent prévisible. Ces contributions sont dès lors porteuses d’enjeux et de perspectives. Elles ne se limitent pas au monde académique ; elles doivent aussi permettre aux régulateurs et aux conseillers financiers de mieux servir les intérêts des investisseurs. Il s’agit en fait de mieux comprendre leurs points faibles afin de leur éviter les pièges que peuvent représenter leurs intuitions, leurs heuristiques, leurs émotions ou leurs excès de confiance. La finance comportementale nous invite ainsi à passer de «l’homo economicus» imaginé par la théorie financière classique à «l’homo sapiens» que nous sommes en réalité...

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On en parle dans la presse...

  • RTBF La Première - Soir Première 17h30, 21.03.2017 : "Finance comportementale", interview de Catherine D'Hondt et Ruddy De Winne par Françoise Gilain.
  • L'Echo, page 13, 21.03.2017 : "Trop de choix fait fuire l'investisseur", article de Jennifer Nille.
  • L'Echo, page 24, 22.03.2017 : "Ces biais qui influencent les investisseurs sur les marchés financiers", article de Jennifer Nille.
  • L'Echo, page 28, 19.04.2017 : "Netflix et Snap, les actions chouchous des Millennials", article de Jennifer Nille.
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