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    題名: A股與B股存在資訊不對稱嗎？資訊持有比例的探討
    作者: 顏彣全
    Yen, Wen-Chuan
    貢獻者: 杜化宇
    顏彣全
    Yen, Wen-Chuan
    關鍵詞: 資訊不對稱
    資訊持有比例法
    價格發現
    B股開放日
    Information asymmetry
    Information shares approach
    price discovery
    B-share deregulation
    日期: 2005
    上傳時間: 2009-09-14 09:00:25 (UTC+8)
    摘要: 資訊不對稱的問題在股市中一直是受關注的議題，一個完善的市場，理應不應當存在資訊不對稱的現象。中國大陸股市在政府宣布開放B股前，上海交易所與深圳交易所中的A股與B股市場屬於完全區隔的現象，國內投資人（多為散戶）只能在A股市場投資，國外投資人（多為金融機構）只能在B股市場投資，在此種制度底下，價格發現機能易受扭曲，資訊不對稱的問題是容易產生的。然而大陸宣布B股開放後，國內投資人可到B股市場投資，資訊不對稱的程度應逐漸變小，改善同家公司在A股與B股市場上市的股票同權不同值的現象。

    本文研究目的即在於探討A股市場與B股市場之間是否存在資訊不對稱問題。利用Hasbrouck（1995）提出的價格發現模型-資訊持有比例法（Information share method），計算何者在價格發現過程中佔有較多的資訊比例。研究對象為上海交易所及深圳交易所內同時有在A股市場與B股市場上市的公司每日股價收盤價。以B股宣告開放日2001年2月19日為中心，將樣本分為開放前與開放後兩階段。進一步在實證中應用Pascual, Pascual-Fuster, and Climent（2006）的研究發現。

    本研究實證結果：第一，B股開放前，不論加入成交量與否，B股市場皆為價格發現支配者。說明A股市場與B股市場間的確存在資訊不對稱現象。第二，B股開放後，A股市場為價格發現支配者，B股與H股市場為衛星市場。推論原因乃來自於2002年後B股市場幾乎停止新股掛牌；B股開放後B股流動性改善，外資以往賺取的溢價減少；人民幣升值議題，加入WTO全面開放資本市場的承諾等。
    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.
    參考文獻: 一、中文部分（按作者筆畫姓名排列）
    1. 王萃強，大陸股市實戰226問，民國九十一年，商周出版。
    2. 沈中華、陳建福， ”B股開放政策對中國大陸股票市場效率性有影響嗎？不對稱門檻共整合模型的應用”，財務金融學刊，民國九十二年十二月，第11期，89-119頁。
    3. 卓莉雯， ”中國大陸開放境內人民投資B股對市場區隔與價格差異之影響”，中興大學財務金融研究所未出版碩士論文，民國九十三年。
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    5. 葉銀華、陳韋均， ”市場區隔與股票異常報酬之研究-中國大陸A、B股市場”，財務金融學刊，民國九十年八月，第9期，39-65頁。
    6. 葉銀華、李存修、潘建福， ”中國大陸股市之市場區隔與價格差異之研究”，證券市場發展季刊，民國九十一年，第14期，45-78頁。
    7. 陳金鑾， ”兩岸三地證券交易制度比較之研究”，中原大學會計研究所未出版碩士論文，民國九十二年。
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    9. 黃昱超， ”一般期貨、小型期貨與現貨市場價格發現過程與資訊傳遞現象研究－以臺灣股價指數市場為例”，淡江大學財務金融研究所未出版碩士論文，民國九十三年。
    10. 楊奕農，時間序列分析-經濟與財務上之應用，民國九十四年，雙葉書廊有限公司出版。
    11. 劉宗盛、歐宏杰，人民幣理財聖經，民國九十四年，平安文化有限公司出版。
    12. 謝欽俊，黃月妙，梁美珠，楊麗貞，章友韾，孫嘉臨，”大陸證券市場發展現況報告”，證交資料，民國九十一年。
    13. 歐宏杰、姚志華、賴朝隆、劉宗聖，香港證券市場投資實務聖經，民國九十二年，育智圖書股份有限公司出版。
    14. “2004年世界主要證券市場相關制度-中國”，證券交易所編彙。
    二、英文部分（按作者姓氏字母排列）
    15. Ahlgren, N., Sjöö, B., and Zhang, J. (2003) “Market segmentation and information diffusion in china’s stock markets: panel data unit root and cointegration tests on A and B share prices”, Working paper.
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    20. Chui, A.C. W., and Kwok, C. C. Y. (1998) “Cross-autocorrelation between A shares and B shares in the Chinese stock market”, The Journal of Financial Research, Vol.21, P333–53.
    21. Covrig, V., Ding, D.K., and Low, B. S. (2004) “The Contribution of a Satellite
    Market To Price Discovery：Evidence From The Singapore Exchange”, The
    Journal of Futures Markets, Vol.24, P981-1004.
    22. Chan, K., Menkveld A. J., and Yang, Z. (2004) “Are domestic investors more informed than foreign investors? Evidence the perfectly Segmented market in China”, Working paper.
    23. De Jong, F. (2002) “Measure of contributions to price discovery: A comparison”, Journal of Financial Markets, Vol.5, P323-327.
    24. Gramming, J., Melvin M., and Schlag, C. (2001) “Price discovery in international equity trading”, Working Paper, University of Frankfurt.
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    26. Harris, F. H., McInish, T. H., and Wood, R. A. (2002) “Security price adjustment across exchanges：an investigation of common factor components for Dow stocks”, Journal of Financial Markets, Vol.5, P277-308.
    27. He, Y., Wu, C., and Chen, Y. M. (2003) “An explanation of the volatility disparity between the domestic and foreign shares in the Chinese stock markets”, International Review of Economics and Finance, Vol.12, P171-186.
    28. Kurov, A., and Lasser, D. J. (2004) “ Price dynamics in the regular and e-mini futures markets”, Journal of Financial and Quantitative Analysis, Vol.39, P365-384.
    29. Kwiatkowski, D., Philiips, P.C.B., Schmidt, P., and Shin, Y. (1992) “Testing the null hypothesis of stationarity against the alternative of a unit root”, Journal of Econometrics, Vol.54, P159-178.
    30. Laurence, M., Cai, F., and Qian, S. (1997) “Weak-form Efficiency and Causality Tests in Chinese Stock Markets”, Multinational Finance Journal, Vol.1, P291-307.
    31. Luo, B., Sun, L., and Mweene, R. (2005) “The evolvement and relevant factors of price discovery: A case study of cross-listed stocks in China”, Exert Systems with Applications, Vol.29, P463-471.
    32. Lin, T. (2005) “Empirical Analysis of the Speed of Adjustment to Information-Evidence from Chinese Stock Market”, PhD dissertation, Drexel University.
    33. Ma, X. (1996) “Capital Controls, Market Segmentation and Stock Prices: Evidence from the Chinese Stock Market”, The Pacific-Basin Finance Journal, Vol. 4, P219-239.
    34. Mei, J., Scheinkman, J. A., and Xiong W. (2004) “Speculative Trading and Stock Price : An Analysis of Chinese A-B share Premia”, Working Paper, Princeton University.
    35. Pascual, R., Pascual-Fuster, B. and Climent, F. (2006) “Cross-listing, price discovery and the informativeness of the trading processs”, Journal of Financial Markets, Vol. 9, P144-161.
    36. Roope, M., and Zurbruegg, R. (2002) “The intra-day price discovery process between the Singapore Exchange and Taiwan Futures Exchange”, Journal of Futures Markets, Vol.22, P219-240.
    37. Raymond, W. So, and Tse, Y. (2004) “Price discovery in the Hang Seng index markets: Index, futures, and the tracker fund”, Journal of Futures Markets, Vol.24, P887-907.
    38. Shang, J., and O’Brien, T. (1997) “China’s equity markets：An analysis of same
    company A-share and B-share prices,1993-1996”, 1997 Ninth Annual PACAP
    Finance Conference, Shanghai, PRC.
    39. Su, D., and Fleisher, B. (1998) “Risk, return and regulation in Chinese stock markets”, Journal of Economics and Business, Vol.50, P239–256.
    40. Su, D., and Fleisher, B. (1999) “Why does return volatility differ in Chinese stock markets?”, Pacific-Basin Finance Journal, Vol.7, P557–86.
    41. Sjöö, B., and Zhang, J. (2000) “Market segmentation and information diffusion in china’s stock markets”, Journal of Multinational Financial Management, Vol.10, P421-438.
    42. Steeley, C. P., and Qian, W. (2005) “Testing for market segmentation in the A and B share markets of China”, Applied Financial Economics, Vol.15, P791-802.
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    三、參考網站
    49. 上海證券交易所。
    50. 深圳證券交易所。
    51. 中華財經網。
    52. 中國證券監督管理委員。
    53. 中國證券登記結算公司。
    描述: 碩士
    國立政治大學
    財務管理研究所
    93357030
    94
    資料來源: http://thesis.lib.nccu.edu.tw/record/#G0093357030
    資料類型: thesis
    顯示於類別:[財務管理學系] 學位論文

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