In relation to the sources of law, explain how each of the following types of law is made:

(c) case law (or common law). (4 marks)

根据我国《保险法》的规定，财产保险合同的被保险人未履行保险标的危险程度增加通知义务的，因保险标的危险程度增加而发生的保险事故，保险人不承担赔偿责任。