Parkes, DavidHuberman, Bernardo A.2010-05-182001Parkes, David C., and Bernardo A. Huberman. 2001. Multiagent cooperative search for portfolio selection. Games and Economic Behavior 35(1-2): 124-165.0899-8256http://nrs.harvard.edu/urn-3:HUL.InstRepos:4101022We present a new multiagent model for the multiperiod portfolio selection problem. A system of cooperative agents divide initial wealth and follow individual worst-case optimal investment strategies from random portfolios, sharing their final profits and losses. The multiagent system achieves better average-case performance than a single agent with the same initial wealth in a simple stochastic market. A further increase in performance is achieved through communication of hints between agents and probabilistic strategy-switching. However, this explicit cooperation is redundant in a market that approximates the Capital Asset Pricing Model, a model of equilibrium stock price dynamics. Journal of Economic Literature Classification Numbers: C63, C73, D83, G11.en-USJournal Article2010-05-1810.1006/game.2000.0799