Before revision:  First, the Arrow-Pratt measure of relative risk aversion for detecting the risk behavior of investors was questioned, and then a new tool  was developed to study the risk behavior of investors .
After revision:  First, the Arrow-Pratt measure of relative risk aversion for detecting the risk behavior of investors was questioned, and then a new tool , that is, the sufficiency factor of the model was developed to study the risk behavior of investors .