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Improved maximin fair allocation of indivisible items to three agents
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abstract
We consider the problem of approximate maximin share (MMS) allocation of indivisible items among three agents with additive valuation functions. For goods, we show that an $\frac{11}{12}$ - MMS allocation always exists, improving over the previously known bound of $\frac{8}{9}$ . Moreover, in our allocation, we can prespecify an agent that is to receive her full proportional share (PS); we also present examples showing that for such allocations the ratio of $\frac{11}{12}$ is best possible. For chores, we show that a $\frac{19}{18}$-MMS allocation always exists. Also in this case, we can prespecify an agent that is to receive no more than her PS, and we present examples showing that for such allocations the ratio of $\frac{19}{18}$ is best possible.
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Maximin Share Guarantees for Few Agents with Subadditive Valuations
For up to four agents with subadditive valuations, a 1/2-MMS allocation always exists and this is tight; for three submodular agents, no allocation can beat a 2/3 fraction.
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