Abstract
During the global financial crisis, two types of short-sale restrictions, i.e., the uptick restriction and the naked short-sale ban, were introduced in the Taiwan Stock Exchange (TWSE). This provides an opportunity to examine whether these two types of short-sale restrictions reduce the speed at which the overnight spot returns and the trading period spot returns adjust to the bad news revealed through the index futures returns during the post-close and pre-open extensions. The results of the threshold GARCH(1,1) model show that only the short-sale ban significantly reduced the speed at which the overnight spot returns react to the bad news revealed by the futures returns of the TWSE index during the pre-open extended session
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