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arXiv 1502.05548cs.GT
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双峰偏好的设施位置

Facility location with double-peaked preference

Aris Filos-Ratsikas, Minming Li, Jie Zhang, Qiang Zhang

摘要:

我们研究的问题,在一个真正的线上的一个单一的设施的报告的基础上,自私的代理,当代理商有双峰的喜好,与高峰是在其位置的两侧。我们观察到,双峰偏好捕捉现实生活中的场景,从而补充了研究充分的单峰偏好的概念。我们主要关注的情况下,峰值等距代理的位置,并讨论我们的结果如何扩展到更一般的设置。我们发现,大多数单峰偏好的结果并不直接适用于这种设置,这使得问题本质上更具挑战性。作为我们的主要贡献,我们提出了一个简单的真实的预期机制,实现了近似比1+b/c的社会和最大成本,其中b是代理从峰值的距离和c是代理的最小成本。对于后一种情况,我们提供了一个3/2的下限的近似比的任何真实的预期机制。我们还研究了在某些自然条件下的确定性机制,证明了下界和近似保证。我们证明,在一大类合理的机制,有没有确定性机制,优于我们的真实预期机制。

英文摘要:

We study the problem of locating a single facility on a real line based on the reports of self-interested agents, when agents have double-peaked preferences, with the peaks being on opposite sides of their locations. We observe that double-peaked preferences capture real-life scenarios and thus complement the well-studied notion of single-peaked preferences. We mainly focus on the case where peaks are equidistant from the agents' locations and discuss how our results extend to more general settings. We show that most of the results for single-peaked preferences do not directly apply to this setting; this makes the problem essentially more challenging. As our main contribution, we present a simple truthful-in-expectation mechanism that achieves an approximation ratio of 1+b/c for both the social and the maximum cost, where b is the distance of the agent from the peak and c is the minimum cost of an agent. For the latter case, we provide a 3/2 lower bound on the approximation ratio of any truthful-in-expectation mechanism. We also study deterministic mechanisms under some natural conditions, proving lower bounds and approximation guarantees. We prove that among a large class of reasonable mechanisms, there is no deterministic mechanism that outperforms our truthful-in-expectation mechanism.

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