공매도가 주가수익률에 미치는 영향

초록

In Korean stock market, negative point of view on short-selling has been consistently raised that short-selling has excessively reduced stock returns(firm value). However prior studies which empirically analyzed the relationship between short-selling and stock returns provides insufficient evidence on it. In addition, it is possible that endogeneity exists between short-selling and stock returns and if so, it is needed that the endogeneity should be considered and controlled analyzing them. Thus, this study investigates the association between short-selling and stock returns after controlling the endogeneity using two stage least squares(2SLS). Results of the study are found that not controlling the endogeneity test using OLS, there existed negative association between short-selling and stock returns at 1% significance level. In other words, short-selling substantially resulted in decrease of stock returns. However, after controlling the endogeneuity test using 2SLS, the significance of negative association between short-selling and stock returns lowered down to 10% level. Therefore, considering the endogeneity, it is hard to predicate that short-selling causes reduction of stock returns. Moreover, those results suggest that researchers analyzing short-selling and stock returns necessarily need to consider the endogeneity between them. This study can provide useful implications to researchers on short-selling and stock market related regulators.

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