Title
Complexity of equilibrium in competitive diffusion games on social networks.
Abstract
In this paper, we consider the competitive diffusion game, and study the existence of its pure-strategy Nash equilibrium when defined over general undirected networks. We first determine the set of pure-strategy Nash equilibria for two special but well-known classes of networks, namely the lattice and the hypercube. Characterizing the utility of the players in terms of graphical distances of their initial seed placements to other nodes in the network, we show that in general networks the decision process on the existence of pure-strategy Nash equilibrium is an NP-hard problem. Following this, we provide some necessary conditions for a given profile to be a Nash equilibrium. Furthermore, we study players' utilities in the competitive diffusion game over Erdos-Renyi random graphs and show that as the size of the network grows, the utilities of the players are highly concentrated around their expectation, and are bounded below by some threshold based on the parameters of the network. Finally, we obtain a lower bound for the maximum social welfare of the game with two players, and study sub-modularity of the players' utilities.
Year
DOI
Venue
2016
10.1016/j.automatica.2016.01.063
Automatica
Keywords
Field
DocType
Competitive diffusion game,Pure-strategy Nash equilibrium,Sub-modular function,NP-hardness,Erdos–Renyi graphs,Social welfare
Correlated equilibrium,Mathematical optimization,Rationalizability,Mathematical economics,Epsilon-equilibrium,Best response,Symmetric equilibrium,Equilibrium selection,Solution concept,Nash equilibrium,Mathematics
Journal
Volume
Issue
ISSN
68
C
0005-1098
Citations 
PageRank 
References 
6
0.44
22
Authors
4
Name
Order
Citations
PageRank
Seyed Rasoul Etesami1337.29
Tamer Basar23497402.11
EtesamiSeyed Rasoul360.44
BaşarTamer460.44