By utilizing the mean adjusted return model of the event study, this paper examines the announcement-period abnormal returns of a sample of 44 divestitures of China's listing companies completed during 1998-2002. The...By utilizing the mean adjusted return model of the event study, this paper examines the announcement-period abnormal returns of a sample of 44 divestitures of China's listing companies completed during 1998-2002. The findings are that sample firms have positive cumulative average abnormal returns in the event windows of [-1, +1] and [0, +7], and that, as for any individual firm, almost half of the sample firms get positive cumulative abnormal returns in a narrow event window. Those results show that the corporate divestitures of China are able to increase shareholders' wealth in a short period around the announcement date.展开更多
发电资产虚拟拆分一般通过拍卖虚拟发电机组(Virtual Power Plant,VPP)来实现,按VPP机组的实际发电调度权来区分,发电资产虚拟拆分存在金融VPP和物理VPP两种模式。为了比较研究两种虚拟拆分模式对发电商市场力的影响,分别建立了考虑金融...发电资产虚拟拆分一般通过拍卖虚拟发电机组(Virtual Power Plant,VPP)来实现,按VPP机组的实际发电调度权来区分,发电资产虚拟拆分存在金融VPP和物理VPP两种模式。为了比较研究两种虚拟拆分模式对发电商市场力的影响,分别建立了考虑金融VPP和物理VPP的电力市场古诺竞争均衡模型,并采用非线性互补方法来求解。从理论上证明了在相同拆分数量的情况下,采用物理VPP模式的虚拟拆分比金融VPP模式更能降低市场价格。算例仿真进一步表明,当需求弹性越小时,物理VPP模式的虚拟拆分在降低市场价格方面优于金融VPP模式的效果更明显。这意味着对于需求弹性相对较低的电力市场,采用物理VPP模式的虚拟拆分更有利于缓解发电商市场力和提高社会福利。展开更多
文摘By utilizing the mean adjusted return model of the event study, this paper examines the announcement-period abnormal returns of a sample of 44 divestitures of China's listing companies completed during 1998-2002. The findings are that sample firms have positive cumulative average abnormal returns in the event windows of [-1, +1] and [0, +7], and that, as for any individual firm, almost half of the sample firms get positive cumulative abnormal returns in a narrow event window. Those results show that the corporate divestitures of China are able to increase shareholders' wealth in a short period around the announcement date.
文摘发电资产虚拟拆分一般通过拍卖虚拟发电机组(Virtual Power Plant,VPP)来实现,按VPP机组的实际发电调度权来区分,发电资产虚拟拆分存在金融VPP和物理VPP两种模式。为了比较研究两种虚拟拆分模式对发电商市场力的影响,分别建立了考虑金融VPP和物理VPP的电力市场古诺竞争均衡模型,并采用非线性互补方法来求解。从理论上证明了在相同拆分数量的情况下,采用物理VPP模式的虚拟拆分比金融VPP模式更能降低市场价格。算例仿真进一步表明,当需求弹性越小时,物理VPP模式的虚拟拆分在降低市场价格方面优于金融VPP模式的效果更明显。这意味着对于需求弹性相对较低的电力市场,采用物理VPP模式的虚拟拆分更有利于缓解发电商市场力和提高社会福利。