Abstract
In this paper, we analyze a transportation game first introduced by Fotakis, Gourvès, and Monnot in 2017, where players want to be transported to a common destination as quickly as possible and, to achieve this goal, they have to choose one of the available buses. We introduce a sequential version of this game and provide bounds for the Sequential Price of Stability and the Sequential Price of Anarchy in both metric and non-metric instances, considering three social cost functions: the total traveled distance by all buses, the maximum distance traveled by a bus, and the sum of the distances traveled by all players (a new social cost function that we introduce). Finally, we analyze the Price of Stability and the Price of Anarchy for this new function in simultaneous transportation games.
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Notes
More specifically, Uber Pool, where different users share the same car to reduce costs and, thus, the vehicle must pick up and deliver users in different locations.
The largest cost of a user is, in fact, the largest distance traveled by a bus.
By unbounded we mean that one can find a sequence of instances with a fixed number of players and buses where the ratio between the social cost of the best SPE and the optimal social cost goes to infinity.
That is, player 1 chooses bus 1, player 2 chooses bus 1 in the subgame where player 1 chooses bus 1, and chooses bus 2 in the subgame where player 2 chooses bus 2, and so on.
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Funding
This research was partially supported by the São Paulo Research Foundation (FAPESP) grants 2015/11937-9, 2016/01860-1, and 2017/05223-9; and the National Council for Scientific and Technological Development (CNPq) grants 308689/2017-8, 425340/2016-3, 314366/2018-0, 425806/2018-9, 311039/2020-0 and 313146/2022-5. This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001.
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Silva, F.J.M.d., Miyazawa, F.K., Romero, I.V.F. et al. Tight bounds for the price of anarchy and stability in sequential transportation games. J Comb Optim 46, 10 (2023). https://doi.org/10.1007/s10878-023-01073-y
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DOI: https://doi.org/10.1007/s10878-023-01073-y