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.
Improving approximation guarantees for maximin share
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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.