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arXiv 1205.4643q-fin.PM
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离散时间中的交易成本、影子价格和对偶性

Transaction Costs, Shadow Prices, and Duality in Discrete Time

Christoph Czichowsky, Johannes Muhle-Karbe, Walter Schachermayer

摘要:

对于具有成比例交易成本的投资组合选择问题,我们讨论了是否存在“影子价格”,即,一个最不利的无摩擦的市场扩展导致相同的最优策略和效用。通过一个明确的反例,我们表明,影子价格可能不存在,即使在看似完美的良性情况下,即,对于在无仲裁市场中交易的日志投资者来说,有界价格和任意小的交易成本。我们还澄清了影子价格和对偶理论之间的联系。而双重极小不需要导致影子价格在上述“全球”意义上,我们表明,他们总是对应于一个“本地”的版本。

英文摘要:

For portfolio choice problems with proportional transaction costs, we discuss whether or not there exists a "shadow price", i.e., a least favorable frictionless market extension leading to the same optimal strategy and utility. By means of an explicit counter-example, we show that shadow prices may fail to exist even in seemingly perfectly benign situations, i.e., for a log-investor trading in an arbitrage-free market with bounded prices and arbitrarily small transaction costs. We also clarify the connection between shadow prices and duality theory. Whereas dual minimizers need not lead to shadow prices in the above "global" sense, we show that they always correspond to a "local" version.

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