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Milgram conducted in the 60s a controversial experiment whose “conclusion” was 6 degrees of separation – “small world effect”
In their study Watts and Strogatz validated the effect on datasets and showed that real world networks are a combination of random graphs and regular lattices (low dimensional lattices with some randomness)
Barabasi et al showed that the degree distribution of many networks is exponential
Agents can outperform humans in unmixed markets and have similar performance in mixed markets (of humans and agents) 
Price posting markets
Cyclic price wars behavior occurs 
What are the roles that agents can take in those markets?
Agent can handle large amount of information and never get tired
 Agent-Human Interactions in the Continuous Double Auction, Das, Hanson, Kephart and Tesauro, IJCAI-01.  The Role of Middle-Agents in Electronic Commerce, Itai Yarom, Claudia V. Goldman, and Jeffrey S. Rosenschein. IEEE Intelligent System special issue on Agents and Markets, Nov/Dec 2003, pp. 15-21.