The world ofrisk neutral is an imaginary world in which the expected returnrateof all risky assets equals to risk-freereturnrate.
风险中性的世界是一个假想的世界,在风险中性世界中所有风险资产的预期收益率等于无风险收益率。
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The article brings forward that qualified and useful risk-freereturnrate can be found through researching on the basis of analyzing the successful utilization in America.