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The shifted pseudoisotropic multivariate distributions are shown to satisfy Ross’ stochastic dominance criterion for two-fund monetary separation in the case with risk-free investment opportunity and furthermore to admit the Capital Asset  Pricing Model under an embedding in L condition if1 <  ≤ 2, with the betas given in an explicit form. For the -symmetric subclass, the market without risk-free investment opportunity admits 2-fund separation if  = 1+1/(2−1), ∈ N, generalizing the classical elliptical case  = 1, and we also give the precise number of funds needed, from which it follows that we cannot, except degenerate cases, have a CAPM without risk-free opportunity. For the symmetric stable subclass, the index of stability is only of secondary interest, and several common restrictions in terms of that index can be weakened by replacing it by the (no smaller) indices of symmetry/of embedding. Finally, dynamic models with intermediate consumption inherit the separation properties of the static models

journal of probability and statistics

Portfolio Theory for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:mi>α</mml:mi></mml:mrow></mml:math>-Symmetric and Pseudoisotropic Distributions:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M2"><mml:mrow><mml:mi>k</mml:mi></mml:mrow></mml:math>-Fund Separation and the CAPM

Portfolio Theory forα-Symmetric and Pseudoisotropic Distributions:k-Fund Separation and the CAPM