To elaborate on "interesting things", at least as I understood it from a seminar by one of the authors... - The distribution of wealth naturally forms an expon

To elaborate on "interesting things", at least as I understood it from a seminar by one of the authors... - The distribution of wealth naturally forms an exponential distribution. It takes effort/energy/negentropy to depart from this situation where there will always be many more poor people than rich. - Unlike particle energy, wealth can be negative. When this is accounted for (allow for debt), the rich inherently get richer. This is not even accounting for interest being paid by the debtors to the (presumably rich) debtees. - At a certain point, money begets more money. This results in a power law tail and identifies the "upper class".