Networks and Heterogeneous Media (NHM)

Liquidity generated by heterogeneous beliefs and costly estimations

Pages: 349 - 361, Volume 7, Issue 2, June 2012      doi:10.3934/nhm.2012.7.349

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Min Shen - CEREMADE, Universite Paris Dauphine, Place du Marechal de Lattre de Tassigny, 75016 Paris, France (email)
Gabriel Turinici - CEREMADE, Université Paris Dauphine, Place du Marechal de Lattre de Tassigny, 75016 Paris, France (email)

Abstract: We study the liquidity, defined as the size of the trading volume, in a situation where an infinite number of agents with heterogeneous beliefs reach a trade-off between the cost of a precise estimation (variable depending on the agent) and the expected wealth from trading. The "true" asset price is not known and the market price is set at a level that clears the market. We show that, under some technical assumptions, the model has natural properties such as monotony of supply and demand functions with respect to the price, existence of an equilibrium and monotony with respect to the marginal cost of information. We also situate our approach within the Mean Field Games (MFG) framework of Lions and Lasry which allows to obtain an interpretation as a limit of Nash equilibrium for an infinite number of agents.

Keywords:  Liquidity, liquidity risk, transaction volume, liquidity model, Mean Field Games, trading volume, information cost, heterogeneous liquidity, heterogeneous beliefs, research cost.
Mathematics Subject Classification:  Primary: 91B24, 91B26; Secondary: 91Gxx.

Received: November 2011;      Revised: March 2012;      Available Online: June 2012.