Steve, Thanks for the tip about Galbraith, since I too am interested in this topic. By way of thanks, and aid to Andrew, Galbraith's URL is http://www.utexas.edu/lbj/faculty/galbraith.html from which one can navigate to relevant working papers at http://utip.gov.utexas.edu/ A *very* quick skim of the most-relevant looking paper** suggests that their focus is more on differences in *levels* of aggregation in the usual SIC system, rather than in different *definitions* of sectors. I think Andrew's point was more in the latter sense -- in fact, I understood it to consider *random* classification schemes. Incidentally, UTIP's stock in trade appears to be the Theil index of inequality -- something of which I seem to have been dimly aware of before, but have certainly not seen in detail -- so thanks for this too. Julian _________________________ ** UTIP working paper #15
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