A股與B股存在資訊不對稱嗎？資訊持有比例的探討

• Main Authors: Yen, Wen-Chuan, 顏彣全
• Other Authors: 杜化宇
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/81482457052473111640

碩士 === 國立政治大學 === 財務管理研究所 === 94 === Information asymmetry is an important issue in the financial market. A perfect market should not exist this phenomenon. Before 2001, domestic investors could only buy A shares while foreign investors could only hold B shares. Under this regulation, the function of price discovery is easily distorted, and information asymmetry occurs easily. Shares with identical rights offered by one company would have different values while they are located in class A and class B. This problem, however, should be improved after the deregulation that domestic investors could buy B shares. The main purpose of this paper is to investigate whether information asymmetry exists between A-share and B-share markets. We use information shares approach (Hasbrouck, 1995) to calculate and compare which market has more information share in the price discovery process. The samples include all firms having stocks trading in A-shares and B-shares market on Shanghai Securities Exchange (SHSE) and the Shenzhen Stock Exchange (SZSE). The sample period, October 6, 1997 to October 31, 2005, is divided into two sub-sample periods. Moreover, the model provided by Pascual, Pascual-Fuster, and Climent (2006) is also implied into this paper. This paper concludes that (1) Before deregulating to allow domestic investors to hold B shares, B-share markets is a dominator in the price discovery process no matter considering trading volume or not. It means that A-share and B-share markets indeed exist information asymmetry. (2) After February 19, 2001, A-share markets become a dominator in the price discovery process while B-share and H- share markets become satellite markets. The possible explanations are that there are seldom companies listing in the B shares markets after 2002; the foreign investor gain less premium than before because of enhancing B-share’s liquidity; Renminbi appreciate and capital markets open completely in the end of 2006.