This project will analyze data collected in two phases of a randomized evaluation of insurance take-up and retention among informal sector workers in Managua, Nicaragua. Using two rounds of existing data collected among 4,000 uninsured workers, this study aims to: 1) measure the causal effects of insurance on the health care utilization of children; 2) analyze health claims data collected from clinics to provide insight on sustainable pricing solutions; and 3) analyse how low retention rates are linked to the quality of care received at public health institutions. The results of this study will be useful to private and public sector insurers interested in developing health insurance products for informal workers.