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"): He went on to consider that if his wife read all the books she could find on the subject of Zulus, coupled with a visit to South Africa to meet them for herself, then in a relatively short period of time she could become one of the leading authorities on that "clearly defined and narrow area of knowledge".
Relevant evidence: No