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Reference.org
Group envy-freeness
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<p>Group envy-freeness (also called: coalition fairness) is a criterion for <a href="/facts/Fair_division/v4PN6nfD">fair division</a>. A group-envy-free division is a division of a resource among several partners such that every group of partners feel that their allocated share is at least as good as the share of any other group with the same size. The term is used particularly in problems such as fair <a href="/facts/Resource_allocation/QmQWt2Yg">resource allocation</a>, <a href="/facts/Fair_cake-cutting/76gbq4GE">fair cake-cutting</a> and <a href="/facts/Fair_item_allocation/Hvx2XrG9">fair item allocation</a>. </p><p>Group-envy-freeness is a very strong fairness requirement: a group-envy-free allocation is both <a href="/facts/Envy-free/LbsxvkUR">envy-free</a> and <a href="/facts/Pareto_efficient/nMTdVPqy">Pareto efficient</a>, but the opposite is not true. </p>