Physics – Physics and Society
Scientific paper
2007-01-29
Physics Letters A{\pounds}?371(1-2) (2007) 58-64
Physics
Physics and Society
14 pages, 7 figures
Scientific paper
10.1016/j.physleta.2007.05.116
We investigate two paradigms for studying the evolution of cooperation--Prisoner's Dilemma and Snowdrift game in an online friendship network obtained from a social networking site. We demonstrate that such social network has small-world property and degree distribution has a power-law tail. Besides, it has hierarchical organizations and exhibits disassortative mixing pattern. We study the evolutionary version of the two types of games on it. It is found that enhancement and sustainment of cooperative behaviors are attributable to the underlying network topological organization. It is also shown that cooperators can survive when confronted with the invasion of defectors throughout the entire ranges of parameters of both games. The evolution of cooperation on empirical networks is influenced by various network effects in a combined manner, compared with that on model networks. Our results can help understand the cooperative behaviors in human groups and society.
Chen Xiaojie
Fu Feng
Liu Lianghuan
Wang Long
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