Perturbation theory in a pure exchange non-equilibrium economy

Details Perturbation theory in a pure exchange non-equilibrium economy Perturbation theory in a pure exchange non-equilibrium economy

2009-04-08

arxiv.org/abs/0904.1402v1

Economy

Quantitative Finance

Trading and Market Microstructure

7 pages, 2 figures

Scientific paper

We develop a formalism to study linearized perturbations around the equilibria of a pure exchange economy. With the use of mean field theory techniques, we derive equations for the flow of products in an economy driven by heterogeneous preferences and probabilistic interaction between agents. We are able to show that if the economic agents have static preferences, which are also homogeneous in any of the steady states, the final wealth distribution is independent of the dynamics of the non-equilibrium theory. In particular, it is completely determined in terms of the initial conditions, and it is independent of the probability, and the network of interaction between agents. We show that the main effect of the network is to determine the relaxation time via the usual eigenvalue gap as in random walks on graphs.

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