1. It is useful to first note, though, that there are numerous situations where the tragedy of the commons does not occur, even when the setting appears to invite it. For example, it was already noted in Section 11 that a noticeable fraction of water supply systems in the U.S. have flat rate billing. Yet demand for water has not exploded. Another example, perhaps more relevant for the Internet since it is in communication;The tragedy of the commons argument does not apply to the Internet. This is demonstrated at length in studies such as those of [Odlyzko6, Odlyzko7, Odlyzko8], which I can only briefly summarize here
2. Abler, Distance, intercommunications, and geography;R F;Proc. Assoc. American Geographers,1971
3. The Nature of Markets in the World Wide Web