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Dear Rosaria
This is only a rough guideline, but someone called Iona
Tarrant at University of Hull did a PhD some years ago (she
is now lecturing at Sheffield) on a comparison of Rousseau
and Sen in relation to social welfare...'conflict between
social welfare function and individual liberty', it says on
the page (found by google on her name).
Perhaps this is of help,
Best wishes,
Nitasha
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