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Assume that j() and k() are both strictly concave single-dimensional functions, that is, j00() ? 0 and k00() ? 0. Can it be guaranteed that
Assume that j() and k() are both strictly concave single-dimensional functions, that is, j00() ? 0 and k00() ? 0. Can it be guaranteed that the following functions are concave? (i) i({) = j({)k({), (ii) i({) = j(k({))
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