Exponential wealth distribution in a random market. A rigorous   explanation
  In simulations of some economic gas-like models, the asymptotic regime shows an exponential wealth distribution, independently of the initial wealth distribution given to the system. The appearance of this statistical equilibrium for this type of gas-like models is explained in a rigorous analytical way. 
Jose-Luis Lopez, Ricardo Lopez-Ruiz and Xavier Calbet
q-fin.GN cs.MA nlin.AO