Geodesic
Bridging the gap between the Nash and Kalai--Smorodinsky bargaining solutions
Contributions to game theory and management, Tome 7 (2014), pp. 300-312

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Bargaining solutions that satisfy weak Pareto optimality, symmetry, and independence of equivalent utility representations are called standard. The Nash (1950) solution is the unique independent standard solution and the Kalai-Smorodinsky (1975) solution is the unique monotonic standard solution. Every standard solution satisfies midpoint domination on triangles, or MDT for short. I introduce a formal axiom that captures the idea of a solution being “at least as independent as the Kalai-Smorodinsky solution.” On the class of solutions that satisfy MDT and independence of non-individually-rational alternatives, this requirement implies that each player receives at least the minimum of the payoffs he would have received under the Nash and Kalai-Smorodinsky solutions. I refer to the latter property as Kalai–Smorodinsky–Nash robustness. I derive new axiomatizations of both solutions on its basis. Additional results concerning this robustness property, as well as alternative definitions of “at least as independent as the Kalai–Smorodinsky solution” are also studied.
Keywords: Bargaining; Kalai–Smorodinsky solution; Nash solution. 
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     author = {Shiran Rachmilevitch},
     title = {Bridging the gap between the {Nash} and {Kalai--Smorodinsky} bargaining solutions},
     journal = {Contributions to game theory and management},
     pages = {300--312},
     publisher = {mathdoc},
     volume = {7},
     year = {2014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CGTM_2014_7_a27/}
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Shiran Rachmilevitch. Bridging the gap between the Nash and Kalai--Smorodinsky bargaining solutions. Contributions to game theory and management, Tome 7 (2014), pp. 300-312. http://geodesic.mathdoc.fr/item/CGTM_2014_7_a27/