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Tracking Portfolio问题

if i want to create a tracking portfolio with beta of 1.4, you need to includes position of 1.4 in the S&P 500 and -0.4 in T-bills. Why i need -0.4 in T-bills?
Thx very much.

portfolio weights must sum to 1, 这个是portfolio定义啊,你其他信息不足,beta 1.4相关的就不说了。

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