In this article, we establish a model of competitive insurance markets based on Rothschild and Stiglitz (1976) where insurers can perform risk classification tests either before insurance contracts are issued (underwriting) or when coverage claims are filed (post-loss test). However, insurers...

We introduce new risk groups to a standard capitation formula and evaluate risk selection incentives of insurers. The study uses a unique data set of almost 24 million affiliates to Government's mandatory health insurance system. This data set is very rich in the sense of reporting all claims...