Question: Who wrote an investment guide published by Orion in 1992 who named his approach to investment when he observed that after reading a short article on the Zulu people in the an American general-interest family magazine, published ten times a year his wife was better informed on the subject than he himself was ?
Sentence (from "The Zulu Principle"): The Zulu Principle: Making Extraordinary Profits from Ordinary Shares is an investment guide written by English accountant and investor Jim Slater, first published by Orion in 1992.
Relevant evidence: Yes