We introduce and discuss a kinetic model for wealth distribution in a simple market
economy which is built of a number of countries or social groups. Our approach is based on the
model with risky investments introduced by Cordier, Pareschi, and Toscani in
On a kinetic model for a simple market economy, and borrows ideas from the kinetic theory of
mixtures of rarefied gases. Wealth is exchanged by individuals inside these countries (domestic trade)
as well as in between different countries (international trade). Under a suitable scaling we derive a
system of Fokker-Planck type equations and discuss its extension to a two-dimensional model with
distributed trading propensity. Theoretical and numerical results for two groups show that the wealth
distribution develops a bimodal (and in general, a polymodal) shape.