Abstract
Martingale optimal transportation has gained significant attention in mathematical finance due to its applications in pricing and hedging. A key distinguishing factor between martingale optimal transportation and traditional optimal transportation is the concept of a peacock, which refers to a sequence of measures satisfying the convex order property. In the realm of traditional optimal transportation, the Wasserstein geometry, induced by a transportation problem with the p-th power of distance as the cost, provides valuable geometric insights. This motivates us to investigate the differences between Wasserstein geometries with and without the martingale constraint. As a first step, this paper focuses on studying the topological properties of convex order, with the aim of establishing a foundational understanding for further exploration of the geometric properties of martingale Wasserstein geometry.
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The authors express their gratitude to Professor Xiaojun Cui from Nanjing University for his valuable discussions and suggestions.
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Feng Wang was supported by the Natural Science Foundation of Jiangsu Province (Grant No. BK20201447), and Science and Technology Innovation Talent Support Project of Jiangsu Advanced Catalysis and Green Manufacturing Collaborative Innovation Center (Grant No. ACGM2022-10-02). Hongguang Wu was supported by the National Natural Science Foundation of China (Grant No. 12201073).
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Ju, H., Wang, F. & Wu, H. Topological properties of convex order in Wasserstein metric spaces. Ricerche mat (2024). https://doi.org/10.1007/s11587-024-00867-4
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DOI: https://doi.org/10.1007/s11587-024-00867-4