That phrase connects the financial disasters of the past 20 years, from the collapse of portfolioinsurance in 1987 to the collapse of mortgage-backed derivatives in 2007.
Linear regression model that can be used to research risk, insurance, portfolio and also can be applied to expect is most common used econometrics model.
线性回归模型是最常用的经济计量模型，用于研究风险、保险、资产组合等经济问题，也可以用作经济预测。
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The result shows portfolioinsurance can avoid risk without restriction on profit.