Before revision:  Extending classic results from an earlier literature, we determine conditions under which (a) solutions exist, are unique and are globally computable, and (b) the resulting wealth dynamics are stationary, ergodic and geometric mixing .
After revision:  Extending classic results from an earlier literature, we determine conditions under which (a) solutions exist, are unique and are globally computable, and (b) the resulting wealth dynamics are stationary, ergodic and geometrically mixing, and (c) the wealth distribution has a Pareto tail .