Two explicit Skorokhod embeddings for simple symmetric random walk

Xue Dong He, Sang Hu, Jan Obłój and Xun Yu Zhou

Stochastic Processes and their Applications, 2019, vol. 129, issue 9, 3431-3445

Abstract: Motivated by problems in behavioural finance, we provide two explicit constructions of a randomized stopping time which embeds a given centred distribution μ on integers into a simple symmetric random walk in a uniformly integrable manner. Our first construction has a simple Markovian structure: at each step, we stop if an independent coin with a state-dependent bias returns tails. Our second construction is a discrete analogue of the celebrated Azéma–Yor solution and requires independent coin tosses only when excursions away from maximum breach predefined levels. Further, this construction maximizes the distribution of the stopped running maximum among all uniformly integrable embeddings of μ.

Keywords: Skorokhod embedding; Simple symmetric random walk; Randomized stopping time; Azéma–Yor stopping time (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1016/j.spa.2018.09.013

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