  The so-called "Yard-Sale Model" of wealth distribution posits that wealth is
transferred between economic agents as a result of transactions whose size is
proportional to the wealth of the less wealthy agent. In recent work [B.M.
Boghosian, "Kinetics of Wealth and the Pareto Law," {\it Phys. Rev. E} {\bf 89}
(2014) 042804], it was shown that this results in a Fokker-Planck equation
governing the distribution of wealth. With the addition of a mechanism for
wealth redistribution, it was further shown that this model results in
stationary wealth distributions that are very similar in form to Pareto's well
known law. In this paper, a much simpler derivation of that Fokker-Planck
equation is presented.
