Why Do Firms Announce Open-Market Repurchase Programs?
探讨企业宣布公开市场股票回购计划后股价上涨的谜团，构建信号模型解释为何即使不实际回购，公告也能带来正向回报，对研究公司公告信号作用和市场反应的学者有参考价值。
Empirically, a price increase accompanies the announcement of an open-market stock repurchase program, even though the announcement is not a commitment. In fact, for many announced programs no shares are ever actually repurchased. This article explores this puzzle. In the single-firm-type version of the model, the option that a firm grants itself by announcing a program does not generate announcement returns. In equilibrium, long-run gains from the informed trading that the option creates are offset by short-run costs from the market's accounting for this adverse selection. Based on this trade-off, I construct a signaling (two-type) model that can deliver announcement returns. In the separating equilibrium, good firms do not incur any cost when they announce programs. Their gains from informed trading in the long run offset the cost of announcement incurred in the short run. Mimicry is costly, because a bad firm's long-run gains from informed trading cannot compensate for the short-run cost of announcing. Copyright 2005, Oxford University Press.