He studies how people make decisions about the health care they use and how those decisions are affected by the out-of-pocket costs they face through high-deductible health plans, and the "transparency" tools made available by public and private insurers and nonprofits. He is working with a major private insurer to develop a price-transparency tool that can be used during a patient visit. He is also studying the impact of cost-conscious aspects of Michigan's Medicaid expansion on participants' health-related behavior.