I put in .9958 for every dollar I got out, so my appreciation of my money is 1/.9958. Subtract that by $1, which is what I put in, and that's how much money I made as a fraction of a dollar.

我投入0.9958美元,得到1美元,我的资产增值为1/0.9958,减去1美元,那是我的投入,这就是每1美元,赚了多少钱

耶鲁公开课 - 金融市场课程节选

1, 10% it means that if the market portfolio goes up 10% in value 10% then this asset also goes up 10% in value.

当β等于1时，If，β,表明若市场组合增值,该资产也同时增值。

耶鲁公开课 - 金融市场课程节选