Does short sale restriction lower price efficiency when substitutes exist? Evidence from the Korean market
2017
Using KOSPI200 index options, futures, and warrants, this study examines the effect of short sale restriction on price efficiency by circumventing the concerns regarding firm characteristics, market conditions, and limited information acquisition of investors in previous empirical studies. This study finds that warrants are as price efficient as other derivatives products after market conditions are considered, even though warrant investors cannot short sell. This finding provides an example that short sale restriction on some assets may not hinder market efficiency if there are close substitutes for those assets in the market.
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