JOSÉ HELENO FARO

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Introdução à Teoria da Escolha
(2005) JOSÉ HELENO FARO; Castro, Luciano Irineu de
Esta monografia está dividida em quatro partes: escolha sob certeza, escolha sob risco e incerteza, escolha sob ambigüidade e escolha social. Antes de descrever o que contém cada uma das partes, vamos esclarecer a distinção entre risco, incerteza e ambigüidade.
Ambiguity through confidence functions
(2009) Chateauneuf, Alain; JOSÉ HELENO FARO
We characterize preference relations over bounded below Anscombe and Aumann’s acts and give necessary and sufficient conditions that guarantee the existence of a utility function u on consequences, a confidence function ϕ on the set of all probabilities over states of nature, and a positive threshold level of confidence ˛0 such that our preference relation has a functional representation J, where given an act f J(f) = min p ∈ L˛0 ϕ 1 ϕ(p) S u(f) dp. The level set L˛0ϕ := {p : ϕ(p) ≥ ˛0} reflects the priors held by the decision maker and the valueϕ(p) captures the relevance of prior p for his decision. The combination ofϕ and˛0 may describe the decision maker’s subjective assessment of available information. An important feature of our representation is the characterization of the maximal confidence function which allows us to obtain results on comparative ambiguity aversion and on special cases, namely the subjective expected utility, the Choquet expected utility with convex capacity, and the maxmin expected utilit