I took that rather flimsy Solon article and made the quantum jump to the book I'm reading, so therein lies some of the confusion. Sorry.
Economic rent - Wikipedia, the free encyclopedia
Take some time to read up on the truly wealthy, the 1% and down to the .01 % and the tension between those in those groups. Of course, the most popular to most of us are Gates and Buffett, and they are interesting studies in themselves. Many in this top tier don't even think of themselves as being "from" a country, since their worlds are now global in nature - in constant travel, in the many homes they own around the world. I've learned, as one would expect, that many of them are sharply interested in influencing government and politics not just in their home country, but in countries in which the sometimes live and do business. The new global economy and the fallout that impacts is all is really fascinating reading.