Abstract
The maximization of Nash welfare, which equals the geometric mean of agents’ utilities, is widely studied because it balances efficiency and fairness in resource allocation problems. Banerjee, Gkatzelis, Gorokh, and Jin (2022) recently introduced the model of online Nash welfare maximization for T divisible items and N agents with additive utilities with predictions of each agent’s utility for receiving all items. They gave online algorithms whose competitive ratios are logarithmic. We initiate the study of online Nash welfare maximization without predictions, assuming either that the agents’ utilities for receiving all items differ by a bounded ratio, or that their utilities for the Nash welfare maximizing allocation differ by a bounded ratio. We design online algorithms whose competitive ratios are logarithmic in the aforementioned ratios of agents’ utilities and the number of agents.
This work is supported in part by an NSFC grant (No. 6212290003).
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Notes
- 1.
Banerjee et al. [6] also gave an \(O(\log T)\)-competitive ratio where T is the number of items, under the assumption that items have unit supplies. Since this paper considers arbitrary supplies, the dependence in T is no longer valid.
- 2.
The original theorem by Banerjee et al. [6] only claimed a weaker bound of \(\log ^{1-\varepsilon } N\) but their proof actually showed a slightly stronger bound that we restate here.
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Huang, Z., Li, M., Shu, X., Wei, T. (2024). Online Nash Welfare Maximization Without Predictions. In: Garg, J., Klimm, M., Kong, Y. (eds) Web and Internet Economics. WINE 2023. Lecture Notes in Computer Science, vol 14413. Springer, Cham. https://doi.org/10.1007/978-3-031-48974-7_23
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