Abstract
In the k-search problem, a player is searching for the k highest (respectively, lowest) prices in a sequence, which is revealed to her sequentially. At each quotation, the player has to decide immediately whether to accept the price or not. Using the competitive ratio as a performance measure, we give optimal deterministic and randomized algorithms for both the maximization and minimization problems, and discover that the problems behave substantially different in the worst-case. As an application of our results, we use these algorithms to price “lookback options”, a particular class of financial derivatives. We derive bounds for the price of these securities under a no-arbitrage assumption, and compare this to classical option pricing.
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J. Lorenz is partially supported by UBS AG.
K. Panagiotou is partially supported by the SNF, grant number: 200021-107880/1.
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Lorenz, J., Panagiotou, K. & Steger, A. Optimal Algorithms for k-Search with Application in Option Pricing. Algorithmica 55, 311–328 (2009). https://doi.org/10.1007/s00453-008-9217-8
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DOI: https://doi.org/10.1007/s00453-008-9217-8