The Mercatus Center at George Mason University offers fellowship programs for students interested in the study of markets and policy. Prospective applicants can learn more about available fellowships through the Mercatus Center's official website:

The Mercatus Center is a university-based research center focused on advancing the understanding of how markets work and how policy affects prosperity. It is located at George Mason University in Arlington, Virginia. The center is part of a broader tradition at George Mason of scholarship in public choice economics, institutional analysis, and market-process theory, and it supports graduate-level research and training in these areas. For students considering advanced study in economics or policy-related fields, the fellowships can provide funding alongside access to Mercatus-affiliated faculty and research networks.

Source: Marginal Revolution