For what it's worth my initial statement was meant to hold beyond income and wealth and generalize to say achievement and productivity and so a lognormal assumption was fitting as the distribution to pick. It also chimed well with grandalf's statement on how advantages multiply.
There are several papers discussing log-normal bulk and then power law tail.
http://physicsworld.com/cws/article/news/2002/feb/26/the-phy...
http://fmwww.bc.edu/ec-p/wp671.pdf and more
For what it's worth my initial statement was meant to hold beyond income and wealth and generalize to say achievement and productivity and so a lognormal assumption was fitting as the distribution to pick. It also chimed well with grandalf's statement on how advantages multiply.