Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/1400
Título: Good deals in markets with frictions
Autor: Balbás, Alejandro
Balbás, Beatriz
Balbás, Raquel
Palavras-chave: Risk measure
Perfect and imperfect market
Stochastic discount factor
Portfolio choice model
Good deal
Data: Jul-2011
Resumo: This paper studies a portfolio choice problem such that the pricing rule may incorporate transaction costs and the risk measure is coherent and expectation bounded. We will prove the necessity of dealing with pricing rules such that there exists an essentially bounded stochastic discount factor, which must be also bounded from below by a strictly positive value. Otherwise good deals will be available to traders, i.e., depending on the selected risk measure, investors can build portfolios whose (risk, return) will be as close as desired to (−infinity, infinity) or (0, infinity). This pathologic property still holds for vector risk measures (i.e., if we minimize a vector valued function whose components are risk measures). It is worthwhile to point out that essentially bounded stochastic discount factors are not usual in financial literature. In particular, the most famous frictionless, complete and arbitrage free pricing models imply the existence of good deals for every coherent and expectation bounded (scalar or vector) measure of risk, and the incorporation of transaction costs will not guarantee the solution of this caveat.
Peer review: yes
URI: http://hdl.handle.net/10400.21/1400
Aparece nas colecções:ISCAL - Comunicações

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