This research was supported by grants from the National Science Foundation (GI-31604 and GI-44336), the National Institute of Mental Health (MH06275), and the Institute for Research on Poverty at the University of WisconsinMadison under funds granted by the Equal Opportunity Act of 1964 and administered by the Department of Health, Education, and Welfare. It was written in part while the author was a Fellow at the Center for Advanced Study in the Behavioral Sciences with support from the National Institute of Mental Health, the Spencer Foundation, and the Graduate School of the University of Wisconsin-Madison. Peter J. Dickinson, Randy D. Hodson, and James Baron assisted in computations, using facilities of the Center for Demography and Ecology that are supported by a grant from the National Institute for Child Health and Human Development (HD-5876). I thank Otis Dudley Duncan, Leo A. Goodman, William Mason, Halliman H. Winsborough, Burton Singer, Harry P. Travis, Taissa S. Hauser, Randy D. Hodson, and Yossi Shavit for advice and criticism. Any
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