主要利用投资者过度自信心理研究A-B股溢价问题。首先,建立了基于投资者过度自信的A-B股溢价模型,模型分析表明:A-B股溢价与国内有信息投资者(收到利好信息)过度自信程度正相关;然后,通过构造度量投资者过度自信程度的指标,实证检验了国内有信息投资者(收到利好信息)的过度自信程度与A-B股溢价之间存在显著的正相关关系。理论和实证研究都表明,利用投资者的过度自信心理能够部分解释A-B股溢价现象。
We examine the effect of investors' overconfidence on A-B share premium.Firstly,we develop an A-B share premium model based on investors' overconfidence,and find that the relationship between A-B share premium and the degree of overconfidence(positive information) is positive.Secondly,we construct an index to measure investors' overconfidence and verify that the degree of overconfidence(positive information) has a significantly positive relationship with the A-B share premium.Therefore A-B share premium can be partly explained based on the investors' overconfidence by the theoretical analysis and empirical tests.