Abstract
We study the complexity of fair division of indivisible goods and consider settings where agents can have nonzero utility for the empty bundle. This is a deviation from a common normalization assumption in the literature, and we show that this inconspicuous change can lead to an increase in complexity: In particular, while an allocation maximizing social welfare by the Nash product is known to be easy to detect in the normalized setting whenever there are as many agents as there are resources, without normalization it can no longer be found in polynomial time, unless P = NP. The same statement also holds for egalitarian social welfare. Moreover, we show that it is NP-complete to decide whether there is an allocation whose Nash product social welfare is above a certain threshold if the number of resources is a multiple of the number of agents. Finally, we consider elitist social welfare and prove that the increase in expressive power by allowing negative coefficients again yields NP-completeness.
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Acknowledgements
We thank the anonymous AMAI, ISAIM 2018, and MPREF 2018 reviewers for helpful comments. This work was supported in part by DFG grant RO 1202/14-2.
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Preliminary versions of this paper have been presented at the15th International Symposium on Artificial Intelligence and Mathematics (ISAIM 2018) in Fort Lauderdale, USA, and at the11th Multidisciplinary Workshop on Advances in Preference Handling (M-PREF 2018), co-located with AAAI 2018 in New Orleans, USA, both with nonarchival proceedings.
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Lange, P., Nguyen, NT. & Rothe, J. The price to pay for forgoing normalization in fair division of indivisible goods. Ann Math Artif Intell 88, 817–832 (2020). https://doi.org/10.1007/s10472-019-09659-1
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DOI: https://doi.org/10.1007/s10472-019-09659-1