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• W2801064462 abstract "Option prices tend to be correlated to past stock market returns due to market imperfections. We unprecedentedly examine this issue on the SSE 50 ETF option in the Chinese derivatives market. To measure the price pressure in the options market, we construct an implied volatility spread based on pairs of the SSE 50 ETF option with identical expiration dates and strike prices. By regressing the implied volatility spread on past stock returns, we find that past stock returns exert a strong influence on the pricing of index options. Specifically, we find that SSE 50 ETF calls are significantly overvalued relative to SSE 50 ETF puts after stock price increases and the reverse is also true after the stock price decreases. Moreover, we validate the momentum effects in the underlying stock market to be responsible for the price pressure. These findings are both economically and statistically significant and have important implications." @default.
• W2801064462 created "2018-05-17" @default.
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• W2801064462 date "2018-04-23" @default.
• W2801064462 modified "2023-10-15" @default.
• W2801064462 title "Option prices and stock market momentum: evidence from China" @default.
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• W2801064462 doi "https://doi.org/10.1080/14697688.2018.1444461" @default.
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