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Two explicit Skorokhod embeddings for simple symmetric random walk
Authors:Xue Dong He  Sang Hu  Jan Obłój  Xun Yu Zhou
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:Corresponding author.  Skorokhod embedding  Simple symmetric random walk  Randomized stopping time  Azéma–Yor stopping time
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