光華講壇——社會名流與企業家論壇第6386期
主題:預期形成中的異質性過度反應:證據和理論Heterogeneous Overreaction in Expectation Formation: Evidence and Theory
主講人:香港中文大學 裴光宇助理教授
主持人:紅寶石hbs平臺登錄網址經濟與管理研究院 肖偉教授
時間:3月9日 14:00—15:30
地點:柳林校區格致樓1211會議室
主辦單位:經濟與管理研究院 科研處
主講人簡介:
Pei Guangyu is an assistant professor at the Department of Economics, The Chinese University of Hong Kong. He received his Ph.D. from the University of Zurich. His primary research interest includes macroeconomics and the Chinese economy, with a special interest in business cycles with informational frictions and ambiguity aversion.
裴光宇,香港中文大學經濟系助理教授。他在蘇黎世大學獲得博士學位,主要研究領域為宏觀經濟學和中國經濟,特別關注具有訊息摩擦和模糊性厭惡的商業周期。
內容提要:
Using firm-level earnings forecasts and managerial guidance data, we construct guidance surprises for analysts, i.e., differences between managerial guidance and analysts' initial forecasts. We document new evidence on expectation formation: (i) analysts overreact to guidance surprises; (ii) the overreaction is state-dependent, i.e., it is stronger for negative guidance surprises but weaker for larger surprises; and (iii) forecast revisions are neither symmetric in guidance surprises nor monotonic. We organize these facts with a model where analysts are uncertain about the quality of managerial guidance. Structural estimation reveals that a reasonable degree of ambiguity aversion is necessary to account for the documented heterogeneous overreaction.
使用公司層面的盈利預測和管理指導數據,我們為預測者構建了一個意外指標,即管理指導數據與他們初始預測之間的差異。我們記錄了關于預期形成的新證據:(i)預測者對意外過度反應;(ii)負面意外會帶來更強的過度反應,而更大規模的意外會削弱過度反應;(iii)預測者的預期調整既不對稱也不單調。為了合理地解釋這些新事實,我們提出了一個基于預測者不確定管理指導數據質量的模型。模型的結構估計表明,合理程度的模糊性厭惡對于解釋異質性過度反應的必要性。