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This study examines the effect of rational and irrational components of
U.S. institutional and individual investor sentiment on Istanbul Stock
Market (ISE) return and volatility. The results showthat there is a significant
spillover effect of U.S. investor sentiment on stock return and
volatility of ISE. A breakdown of sentiment by the type of investor
shows that the impact of institutional sentiment is greater than that of
individual sentiment. A breakdown of sentiment by rationality shows
that the effect of rational sentiment on ISE return is faster though not
necessarily greater than that of irrational sentiment. The conclusion
fromthese results is that the effect of U.S. investor sentiment is systemic
and cannot be diversified away. U.S. investor sentiment, therefore,
constitutes a priced risk factor and must be accounted for accordingly
in international asset pricing models. The findings also provide some
evidence of a negative relationship between U.S. investor senti