Your guess is as good as mine.. but I imagine it's covered in the publication: https://www.russellsage.org/publications/long-shadow https://www.russellsage.org/

Your guess is as good as mine.. but I imagine it's covered in the publication: https://www.russellsage.org/publications/long-shadow https://www.russellsage.org/publications/long-shadow Tables/data from it is available: https://www.russellsage.org/sites/all/files/Alexander_TablesFigures.pdf https://www.russellsage.org/sites/all/files/Alexander_Tables... Edit: Google books: http://books.google.com/books?isbn=1610448235 http://books.google.com/books?isbn=1610448235