Abstract
This study examines whether the investment behavior of securities dealers is consistent with the predictions of the house money and break-even effects. Using the stock portfolios, dealers hold in Taiwan from 1996 to 2013 as a sample, we test the relationship between trading gains/losses and subsequent changes in portfolio risk. The results show that only gains with low risks, not all gaining situations, cause subsequent risk preferences, and regardless of the size of the trading loss, there is not a significant change in subsequent risk. Controlling dealers’ characteristics, industry competition, and the stock market condition, the evidence shows that the house money effect on dealer behavior exists after earning low-risk profits and does not support the break-even effect. These results are qualitatively unchanged after robustness checks that primarily exclude dealer overconfidence effect and ensure that the risk-taking behavior under low risks results in a decrease in gains and thus not a rational behavior.
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