Previous empirical studies show that there is a statistically significant relation
between idiosyncratic volatility and expected stock returns, especially on the NYSE, Amex, and Nasdaq. Similarly, the findings of this paper document that expected idiosyncratic volatility for individual stocks has a significant effect on expected stock returns. Even though models control for liquidity variables, it still has a significant effect on expected stock returns for stock sector. The daily data for testing come from SET50 and stock sector of the Stock Exchange of Thailand.
coefficients of idiosyncratic volatility are quite equivalent magnitudes in all the models for both individual stock and stock sector. More importantly, liquidity variables do not change a significant effect of expected idiosyncratic volatility. This evidence supports the assumption of under-diversification which states that idiosyncratic volatility is positively related to
expected stock returns because the investor might not hold perfectly diversified portfolio.
Previous empirical studies show that there is a statistically significant relationbetween idiosyncratic volatility and expected stock returns, especially on the NYSE, Amex, and Nasdaq. Similarly, the findings of this paper document that expected idiosyncratic volatility for individual stocks has a significant effect on expected stock returns. Even though models control for liquidity variables, it still has a significant effect on expected stock returns for stock sector. The daily data for testing come from SET50 and stock sector of the Stock Exchange of Thailand.coefficients of idiosyncratic volatility are quite equivalent magnitudes in all the models for both individual stock and stock sector. More importantly, liquidity variables do not change a significant effect of expected idiosyncratic volatility. This evidence supports the assumption of under-diversification which states that idiosyncratic volatility is positively related toexpected stock returns because the investor might not hold perfectly diversified portfolio.
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