英文摘要
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This paper investigates a day trading's impact on the idiosyncratic volatility of Taiwan's ETF50 in January, 2014. Executing the policy, the investors can choose to pay the gap between buying and selling amounts on the same day, besides margin trading and short selling. Improving willingness of investors to participate in stock market and attracting varied new investors to trade, the policy may cause changing of risk. We observe the idiosyncratic volatility of index ETF50 and its components before and after executing policy, and it could reflect the time varying risk that can't be explained by system risk, firm size premium, and value premium. The empirical result shows that the idiosyncratic volatility decreases after policy of day trading. Lifting the restriction on capital market improves the stability and soundness of capital market. The government could consider lifting bans on capital market progressively and let market mechanism go where it wants to go.
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