...usality strength will be discussed in the section: Buying by institute investors in the stock market example [50]. →  + Increase of composit... ...n, the (FCR–1) is equivalent to the following: Not buying by institute investors →  + Not increase of composite stock price. (FCR–2) Here... ...nti- quanity fuzzy sets. Then the following holds: Selling by institute investors →  + Decrease of composite stock price. (FCR-3) Here “s... ...of Decision Science and Managerial Economics), The Chinese University of Hong Kong, (1993), 129-142. 65. Lee, K.C., W.J. Lee, O.B. Kwon, J.H. Han... ...ecision Science and Managerial Economics), The Chinese University of Hong Kong, (1993), 129-142. 65. Lee, K.C., W.J. Lee, O.B. Kwon, J.H. Han, P.I...