Chapter 8: Looking Backward, footnote 8, page 329 Ch8 fn. 8 p. 329 Tags: Discursive, Histories and Biographies, Anti-Monopoly, Ideology Posner, "Natural Monopoly and Its Regulation," 548-643. Sharkey, Theory of Natural Monopoly, vii-27. Gerald Berk does not see this natural monopoly as describing the mature railroad industry. Berk, Louis Brandeis and the Making of Regulated Competition, 1900-1932 (New York: Cambridge Univ. Press, 2009), 75-88.