Quadratic expansions in optimal investment with respect to perturbations of the semimartingale model
Quadratic expansions in optimal investment with respect to perturbations of the semimartingale model
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最优投资相对于半鞅模型扰动的二次展开
DOI:
10.1007/s00780-024-00532-6
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发表时间:
2024
影响因子:
1.7
通讯作者:
Sîrbu, Mihai
中科院分区:
文献类型:
--
作者:
Mostovyi, Oleksii;Sîrbu, Mihai
We study the response of the optimal investment problem to small changes of the stock price dynamics. Starting with a multidimensional semimartingale setting of an incomplete market, we suppose that the perturbation process is also a general semimartingale. We obtain second-order expansions of the value functions, first-order corrections to the optimisers, and provide the adjustments to the optimal control that match the objective function up to the second order. We also give a characterisation in terms of the risk-tolerance wealth process, if it exists, by reducing the problem to the Kunita–Watanabe decomposition under a change of measure and numéraire. Finally, we illustrate the results by examples of base models that allow closed-form solutions, but where this structure is lost under perturbations of the model where our results allow an approximate solution.
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DOI:
--
发表时间:
2021
期刊:
Graduate Studies in Mathematics
影响因子:
--
作者:
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通讯作者:
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影响因子:
1.7
作者:
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DOI:
--
发表时间:
2015
期刊:
影响因子:
--
作者:
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