臺灣證交所自1990年8月開始實施異常交易監視辦法,在1990年8月至1992年10月這段期間,如果股票的價格、成交量、過轉率、集中度超過某一樣標準,證交所會先予以警示,連續警示後,若情況未改善,則處以收足款券、分盤交易或暫停交易等措施。本研究旨在探討此制度對股票價格行為效率,性、波動性、流動性的影響。主要分成下列兩部份:(1)警示對股價行為的影響,(2)不同處置措施對股價行為的影響,並以實證分析。研究結果發現,除了連續警示的狀況以外,警示宣告的確能改進股票之價格行為。一般而言,處置措施能夠減少波動性,降低異常報酬並減少股票之異常流動性。
In this paper we investigate the effect of warning announcements on the price behavior of stocks, as well as the effects of various corrective treatments (trading halts, call trading, 100% payment/delivery with order) on the performance of stocks in Taiwan stock market. We found that warning announcement does serve to improve the performance of stocks, except in the-consecutive warning cases. Generally speaking, the corrective measures taken after the consecutive warnings are able to reduce the volatility, the abnormal returns and the excess liquidity of the stock.