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AKSOE: Physik sozio-ökonomischer Systeme

AKSOE 3: Postersitzung

AKSOE 3.7: Poster

Monday, March 8, 2004, 16:00–18:00, Poster D

Evolution of Investor Coalitions in a Multi-Agent Market Simulation — •Adrian Marcelo Seufert¹ and Frank Schweitzer² — ¹Technische Universität Berlin — ²Fraunhofer Institut für Autonome Intelligente Systeme

We analyze the evolution of investor’s preference networks by means of a multi-agent market simulation. In our model, N investors interact with I initiators over several periods of time. In each period, a randomly chosen initiator i proposes a project into which investors k decide to invest a proportion of their budget or not, depending on their “trust” in the initiator. That trust is quantified by a number w_ki, that depends on past experience with that initiator. The return on investment is then randomly picked from a distribution r_i (t) that characterizes the particular initiator. A positive return boosts the trust of the investors in that initiator, a negative return diminishes it. Over time we observe the development of preference networks, that is, of investors interacting with certain initiators on a preferential basis, while largely ignoring others. Particular emphasis is placed on the analytical understanding of the Network dynamics using methods from statistical physics and the theory of stochastic processes.