The $-game

Details The $-game The $-game

2002-05-20

arxiv.org/abs/cond-mat/0205423v1

Eur. Phys. J. B 31, 141-145 (2003) DOI: 10.1140/epjb/e2003-00017-7

Physics

Condensed Matter

Revtex, 7 pages

Scientific paper

10.1140/epjb/e2003-00017-7

We propose a payoff function extending Minority Games (MG) that captures the competition between agents to make money. In constrast with previous MG, the best strategies are not always targeting the minority but are shifting opportunistically between the minority and the majority. The emergent properties of the price dynamics and of the wealth of agents are strikingly different from those found in MG. As the memory of agents is increased, we find a phase transition between a self-sustained speculative phase in which a ``stubborn majority'' of agents effectively collaborate to arbitrage a market-maker for their mutual benefit and a phase where the market-maker always arbitrages the agents. A subset of agents exhibit a sustained non-equilibrium risk-return profile.

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