suppose that empirical data suggest an individual requires an average return of 0.5 percent if he or she is to be tempted to invest in an invesment that has 50-50 chance of gaining or losing 5 percent.
这是尼那本书地十八章课后第八题的第三问的题干的一部分,感觉不好理解,谁能帮忙解释一下
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