And indicates that assuring the insurance must possess five elements: firstly, existent of insurable risk; secondly, congregation and disgregation of many homogeneous risks; thirdly, rating of insurance premium rate; fourthly, setting up insurance capital; fifthly, making the insurance contract.
指出保险的确立必须具备五个要素：一是可保风险的存在；二是大量同质风险的集合与分散；三是保险费率的厘定；四是保险基金的建立；五是保险合同的订立。
参考来源 - 美国保险业的发展及其对我国的启示