The research for this article was funded by the National Science Foundation (Applied Science and Research Applications) under Grant NSF CI-43949. The author gratefully acknowledges this support. Any findings, inferences, views or opinions expressed herein are, however, those of the author and do not necessarily reflect those of the National Science Foundation.
The author also acknowledges the valuable assistance of Frances P. Pennell. John Mclver, Elinor Ostrom, Roger B. Parks, and Eric J. Scott who commented on earlier drafts of this article.