Weizhou Wang2019-06-09 10:24:47
第10题,BSM assumption里面, stock price 是lognormal, 但是stock return不是assume normal 吗?
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Paroxi2019-06-10 13:45:21
同学你好,旧教材中假设资产价格服从对数正态分布,收益率服从正态分布,新的教材改版之后对于收益率进行了重新的定义,将P1/P2定义为收益率,因为连续收益率LN(P1/P2)服从正太分布,那么P1/P2收益率只能服从对数正太分布。原文为The underlying follows a statistical process called geometric Brownian motion,which implies a lognormal distribution of the return, meaning that the logarithmicreturn, which is the continuously compounded return, is normallydistributed.
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