New York: The Macmillan Company/London: Macmillan & Co., Ltd., 1906. First edition. 8vo. xxi, (1) l., 427 pp., (1) l. Previous bookseller note indicates this copy is from the library of Nobel Prize of Economics winner William Vickrey, "Present in this copy is an example of Vickrey's intriguing method of coding his books using unobtrusive thin bands of colored pigment neatly applied to the foot of the spine. No one to my knowledge has been able to crack the code, including several colleagues at Columbia of whom I inquired when I purchased his library." Publisher's green cloth-covered boards, stamped in gilt, green and blue stripes painted to foot of spine, spine ends lightly rubbed, minor fading; all edges trimmed; some scattered minor spotting, light offsetting on pp. 8/9.