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—Editorial by Andrew Grindlay, The University of Western Ontario

—Letter to the Editor by Paul E. Green, Wharton School of Finance and Commerce, University of Pennsylvania, Ronald E. Frank, Wharton School of Finance and Commerce, University of Pennsylvania and Patrick J. Robinson, Marketing Science Institute, Philadelphia

—Letter to the Editor by Bertram Schoner, University of Iowa

—Letter to the Editor by Myron J. Gordon, University of California, Berkeley

—Letter to the Editor by Milton D. Rubin, P.O. Box 228, Bedford, Massachusetts