My comment: It turns out--I did not know because Wikipedia does not say explicitly http://en.wikipedia.org/wiki/Gini_coefficient
--that Gini coefficient has to definitions. See
United States. OECD.StatExtracts, undated
stats.oecd.org/Index.aspx?QueryId=26068
("Gini coefficient (after taxes and transfers)' and "Gini coefficient (after taxes and transfers)")
Click "ESTATE & HISTORY" button in the upper right corner, and you will learn the estate was constructed for 8 years (beginning in 1814) by James Barbour.
(b) 美国国家记者俱乐部 National Press Club http://press.org/