We briefly review results on nonlinear kinetic equation of Boltzmann typewhich describe the evolution of wealth in a simple agents market. Themathematical structure of the underlying kinetic equations allows to usewell-known techniques of wide use in kinetic theory of rarefied gases to obtaininformation on the process of relaxation to a stationary profile, as well as toidentify simple interaction rules which are responsible of the formation ofPareto tails.
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