currently in revise & resubmit status at American Journal of Sociology word count = 21,871 without footnotes; 28,371 with footnotes 1 The authors gratefully acknowledge a series of small grants from the Social Science Division of the University of Chicago, which helped in the collection of data, and a substantial grant from the Hewlett Foundation, which funds John Padgett’s and Walter Powell’s “Co-evolution of States and Markets ” program at the Santa Fe Institute. SFI is the intellectual and research home of this project; we deeply appreciate its support over numerous years. David Sallach

The authors gratefully acknowledge a series of small grants from the Social Science Division of the University of Chicago, which helped in the collection of data. The Santa Fe Institute enthusiastically gave intellectual and research support to the first author. SFI is a creative environment in which to work. David Sallach and Nick Collier, of the Social Science Research Computing Center at the University of Chicago, offered the kind gift of their services in helping to organize the data into relational data-base form. We have received helpful comments on an earlier draft of