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We examine the relative effects of rational and irrational investor sentiments on Dow Jones Industrial Average and S&P500 returns. The impact of rational sentiments on stock market returns is found to be greater than that of irrational sentiments. There are immediate positive responses of stock market returns to irrational sentiments corrected by negative responses in the upcoming periods. There are positive effects of past stock market returns on irrational sentiments but not on rational sentiments. The results support the economic fundamentals-based arguments of stock returns. Evidence in favour of irrational sentiments is consistent with the view that investor error is a significant determinant of stock returns.

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