The present essay review propones a new model to understand the nature of risk. The authors hereby argue that risks help the society to function. Not only the sum-zero risk society is impossible, but also would affect seriously the economy of capitalist society. Therefore, insurances and risk are inexorably intertwined. The authors have explored three valid indicators toward the construction of a general-index of risk, which not only can be homologable to other nations, but also comparable among cultures. Communities may be studied by their way of perceiving risks. Beyond the debate on if terrorism is or not a risk, the goals of this review is twofold. Firstly, it is important to explore the economic nature of terrorism to discern their causes. Secondly, it is necessary to build a valid index that reflects how a society feels.