For years, Professor John Graves, PhD, has been studying health care markets and the policies that influence them. Using statistical models and data from multiple sources, Graves develops models to inform decision-makers and policymakers.Graves heads a small group of faculty in the Department that aims to answer a simple question asked in dozens of different contexts within health care: Is it worth it? For example, is what we spend on a particular intervention returning the results we want in terms of lives saved or expensive care reduced or averted?