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I am grateful to Arthur Goldberger and Robert Hall for comments on an earlier draft, to Franklin Fisher for stimulating discussions on many of the topics treated, to Samuel Popkin and Lawrence McCray for valuable editorial suggestions, and to Raisa Deber, Robert Eccles, and Takashi Inoguchi for research assistance. A timely grant from the office of Provost Walter Rosenblith covered production expenses.
Douglas A. Hibbs (Mon,) studied this question.