A stochastic control approach to no-arbitrage bounds given marginals, with an application to lookback options

We consider the problem of superhedging under volatility uncertainty for an investor allowed to dynamically trade the underlying asset, and statically trade European call options for all possible strikes with some given maturity. This problem is classically approached by means of the Skorohod Embedd...

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Bibliographic Details
Published in:arXiv.org 2014-01
Main Authors: Galichon, A, Henry-Labordère, P, Touzi, N
Format: Article
Language:English
Subjects:
Arbitrage
Martingales
Optimal control
Optimization
Put & call options
Random walk theory
Stochastic processes
Transportation problem
Volatility
Online Access:Get full text
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Summary:We consider the problem of superhedging under volatility uncertainty for an investor allowed to dynamically trade the underlying asset, and statically trade European call options for all possible strikes with some given maturity. This problem is classically approached by means of the Skorohod Embedding Problem (SEP). Instead, we provide a dual formulation which converts the superhedging problem into a continuous martingale optimal transportation problem. We then show that this formulation allows us to recover previously known results about lookback options. In particular, our methodology induces a new proof of the optimality of Az\'{e}ma-Yor solution of the SEP for a certain class of lookback options. Unlike the SEP technique, our approach applies to a large class of exotics and is suitable for numerical approximation techniques.
ISSN:2331-8422
DOI:10.48550/arxiv.1401.3921