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Weakly time consistent concave valuations and their dual representations

机译:时间一致的凹凹估值及其双重表示

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摘要

We derive dual characterizations of two notions of weak time consistency for concave valuations, which are convex risk measures under a positive sign convention. Combined with a suitable risk aversion property, these notions are shown to amount to three simple rules for not necessarily minimal representations, describing precisely which features of a valuation determine its unique consistent update. A compatibility result shows that for a time-indexed sequence of valuations, it is sufficient to verify these rules only pairwise with respect to the initial valuation, or in discrete time, only stepwise. We conclude by describing classes of consistently risk averse dynamic valuations with prescribed static properties per time step. This gives rise to a new formalism for recursive valuation.
机译:我们推导了凹估值的两个弱时间一致性概念的双重特征,这是在正号惯例下的凸风险度量。这些概念与适当的风险规避属性相结合,显示为三个简单的规则(不一定是最小的表示形式),它们精确地描述了估值的哪些特征决定了其唯一一致的更新。兼容性结果表明,对于按时间索引的估值序列,仅相对于初始估值成对地验证这些规则就足够了,或者仅在逐步的时间内离散地验证这些规则就足够了。最后,我们通过描述每时间步长具有规定静态属性的持续风险规避动态估值类别。这引起了递归估值的新形式主义。

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