“Ambiguity as to what factors are responsible for superior (or inferior) performance acts as a powerful block on both imitation and factor mobility.”
Source: "Uncertain imitability", 1982, p. 420
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Richard Rumelt 25
American economist 1942Related quotes
Source: Beyond Hypocrisy, 1992, Doublespeak Dictionary (within Beyond Hypocrisy), p. 125.

1930s, On Protracted Warfare (1938)

Quoted in Michaud, Stephen; Aynesworth, Hugh (1999) The Only Living Witness: The True Story of Serial Sex Killer Ted Bundy (Paperback; revised ed.). Irving, Texas: Authorlink Press. pg. 326
Source: The Theory of Gambling and Statistical Logic (Revised Edition) 1977, Chapter Seven, Blackjack, p. 215

Source: The Scientific Analysis of Personality, 1965, p. 160

Re: O'reilly subjugated to the Lisp juggenaut http://groups.google.com/group/comp.lang.lisp/msg/a10d0e7d8e7354b2 (Usenet article).
Usenet articles, Miscellaneous
Source: The Inefficient Stock Market - What Pays Off And Why (1999), Chapter 5, Predicting Future Stock Returns with the Expected-Return Factor Model, p. 56
Violet M. Firth (Dion Fortune) (1922), The Machinery of the Mind. p. 96