Why are the prices of European‐style derivatives greater than the prices of American‐style derivatives?
研究发现香港欧式衍生权证价格普遍高于同类美式期权，流动性差异是主要解释因素，其他原因包括信用风险、投资者偏好等。
Abstract The prices of European‐style derivative warrants in Hong Kong are generally higher than those of identical American‐style options. We show that liquidity differences have strong explanatory power for this overpricing behavior, especially for low moneyness and long‐term derivatives. Other causative factors include counterparty credit risk, investor preference, information asymmetry, volatility discovery, exercise style, market makers' behavior, and investor sentiment. We also find a big gap in market‐wide liquidity between the two markets. Specifically, lower liquidity results in the weaker efficiency of the options market compared with the derivative warrants market.