We try to provide reasonable explanations for the equity premium puzzle by the mental account, prospect theory, disposition effect and hedonic editing. This study examine how do investor trade in relation to their holding portfolio gains and losses? The empirical evidence suggests that investor are more likely to segregated gains and integrated losses, in accordance with disposition effect and hedonic edition. In other words, investor are more likely to longer holding losing trade than winning trade, because selling at losing trades would cause great suffering. We find that investor tend to longer holding mixed gains than mixed big losses. In face of mixed big losses, they are relatively rational, inconsistent disposition effect. Our empirical find that highest wealth level‘s traders and experienced traders suffer loss, they are relatively rational.

Hedonic Editing is a theory of behavioral finance based on prospect theory, attempting to predict whether individuals would segregate or integrate multiple outcomes to achieve to highest perceived value. We test the theory by an actual market data in Taiwan Futures Exchange. If the hypothesis holds, we should observe that investors would integrate losses more frequently than gains and integrate smaller losses with larger gains rather than the other way around. However, results do not support the hypotheses totally. We further test the theory by different trader types. Results show that domestic individuals exhibit the strongest biases of hedonic editing, followed by domestic corporations, and foreign institutions.