Abstract
We address optimal group manipulation in multi-dimensional, multi-facility location problems. We focus on two families of mechanisms, generalized median and quantile mechanisms, evaluating the difficulty of group manipulation of these mechanisms. We show that, in the case of single-facility problems, optimal group manipulation can be formulated as a linear or second-order cone program, under the \(L_1\)- and \(L_2\)-norms, respectively, and hence can be solved in polynomial time. For multiple facilities, we show that optimal manipulation is NP-hard, but can be formulated as a mixed integer linear or second-order cone program, under the \(L_1\)- and \(L_2\)-norms, respectively. Despite this hardness result, empirical evaluation shows that multi-facility manipulation can be computed in reasonable time with our formulations.
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Notes
- 1.
Anonymity is critical, as dictatorial mechanisms belong to the class of GMMs and are group strategy-proof.
- 2.
Barberà et al.’s [2] characterizations do not preclude the existence of group strategy-proof mechanisms when specific cost functions are used. However, it is still meaningful to study the group manipulation of GMMs and QMs due to their simplicity and intuitive nature, their (individual) strategy proofness, and their flexibility. Indeed, these are the only “natural” such mechanisms for multi-dimensional, multi-FLPs of which we are aware.
- 3.
NP-hardness refers to the corresponding decision problem (as is colloquially understood for optimization problems): is there a misreport that gives the manipulators total cost less than epsilon (for any fixed epsilon). This implies NP-hardness of existence (set cost to truthful cost).
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Sui, X., Boutilier, C. (2015). Optimal Group Manipulation in Facility Location Problems. In: Walsh, T. (eds) Algorithmic Decision Theory. ADT 2015. Lecture Notes in Computer Science(), vol 9346. Springer, Cham. https://doi.org/10.1007/978-3-319-23114-3_30
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