The enemy of my enemy is my friend: new conditions for network games

Hideto Koizumi

Economic Theory Bulletin, 2023, vol. 11, issue 2, No 7, 223-233

Abstract: Abstract Group formation tends to involve peer effects. In the presence of such complementarities, however, coalitional games need not have a nonempty core. With a restricted preference structure, I provide new sufficient conditions for the nonemptiness of the core of network games that involve pairwise complementarities between peers. The conditions are twofold: (a) sign-consistency—all agents agree on the sign of the value of any link—and (b) sign-balance—the enemy of my enemy is my friend. My conditions provide a game-theoretic explanation for the longevity of the dichotomy of political alliances in the contemporary world.

Keywords: Network games; Coalition formation; Cooperative games; Core (search for similar items in EconPapers)
JEL-codes: C62 C68 C71 C78 D44 D47 D50 (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (1)

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DOI: 10.1007/s40505-023-00253-7

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