Abstract
Buy-sell imbalance is a crucial behavioral factor in the stock market. This paper emphasizes that buy-sell imbalance plays a systematic role in the market's mean-variance relation. Besides, the influence of buy-sell imbalance on the market's mean-variance relation is time-varying. As buy-sell imbalance is negative, the market's mean-variance relation is significantly negative; as buy-sell imbalance is positive, the market's mean-variance relation is insignificant. Furthermore, our analyses are robust across different conditional variance models and market portfolios with different values of stock capitalization.
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