Market equilibrium with heterogeneous behavioural and classical investors' preferences
Starting from the theory of portfolio selection under Cumulative Prospect Theory (CPT) in a one period model, we firstly present some remarks connected with the violation of the so-called loss aversion in the case of power utility functions. The main contribution of this paper comes from the analysis of two equilibrium models. In the first one, an Expected Utility (EU) maximizer, a CPT agent and an accommodating market maker are allowed to interact. We show that there can be equilibria with null, positive or total risky investment by the CPT trader. Our results are then compared to an analogous model with two EU maximizers. On the contrary, the second financial market is populated by a sufficiently large number of EU agents and CPT agents, each of them being price maker and endowed with possibly heterogeneous preferences, these two facts being new to the literature. This time EU traders fully invest in stocks whereas CPT traders stay out of the risky market. For both models, equilibrium existence and robustness is shown using analytical and numerical methods.
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