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Published online by Cambridge University Press: 07 November 2014
The study the results of which are summarized in this note was conducted in part at the Institute for Economic Research, Queen's University. My thanks go to Professors E. F. Beach of McGill University and R. G. D. Allen and M. G. Kendall both of the London School of Economics, who gave me their comments and advice at various stages of this work. They are not responsible for any errors or mistakes the note may contain.
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