“…This is a characteristic of a multiplicative stochastic process, where the changes in the value of a variable are proportional to the value, rather than an additive process, where the changes are independent of the value (e.g., random walks). This lends support to the assumptions of asset exchange models for wealth distribution [2,3,4,5,6,7], according to which, the amount lost or gained by agents through each trading interaction is a random fraction of their wealth at a given instant. The data, although of low resolution, is suggestive of a log-normal distribution in the low-to middle-income range.…”