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- Presented at the August 1972 meetings of the American Sociological Association, New Orleans, Louisiana. We are indebted to Harrison C. White, for his helpful comments on an earlier version.
- Research supported by National Science Foundation Grants GP‐8774 and GS‐2044X.
- Present address: NBER, Computer Research Center, Cambridge, Massachusetts.
- Research supported in part by a Postdoctoral Fellowship from the Social Science Research Council.