Now, underlying our theory is the idea that we measure the outcome of your investment in your portfolio by the mean of the return on the portfolio and the variance of the return on the portfolio.

而理论的基础是,我们通过计算,组合收益率的均值，和组合收益率的方差,来衡量一个投资组合的优劣。

耶鲁公开课 - 金融市场课程节选

Looking at real rates can help you determine how much your purchasing power may grow, says Mihir Worah, head of the real-return portfolio management team at Pacific Investment Management Co.

WSJ: Savviest Investors Pay Close Attention to 'Real' Interest Rates

Actuaries guess, er, compute how much money is needed today based on life expectancies of retirees as well as the expected investment return on the pension portfolio.

WSJ: Andy Kessler: The Pension Rate-of-Return Fantasy

Overall, his tax return looks like a wealthy retiree with a large investment portfolio, and he has the luxury of waiting to generate long-term capital gains.

FORBES: Mitt Romney Is Hardly A Pig When It Comes To Tax Deductions