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 ?
The Zulu Principle:  Slater named his approach to investment when he observed that after reading a short article on the Zulu people in the "Reader's Digest" his wife was better informed on the subject than he himself was.
i don't know