We present necessary and sufficient conditions on the asset span of incomplete derivative markets for insuring marketed portfolios. If the asset span is finite dimensional there exists a polynomial-time algorithm for deciding if every marketed portfolio is insurable, moreover this algorithm computes the minimum cost insurance portfolio. In addition, we extend the Cox-Leland characterization of optimal portfolio insurance in complete derivative markets to asset spans of incomplete derivative markets where every marketed portfolio is insurable.
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Aliprantis, C. D. & Brown, D. J. & Polyrakis, I. A. & Werner, J., 1996.
"Yudin Cones and Inductive Limit Topologies,"
Working Papers
964, California Institute of Technology, Division of the Humanities and Social Sciences.
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