1. Why is infrastructure important?;Aschauer,1989
2. Convergence across states and regions;Barro;Brookings Papers on Economic Activity,1991
3. Contestable markets and the theory of industry structure;Baumol,1982
4. The contribution of infrastructure to regional development;Biehl,1986
5. The evolution of US airline competition;Borenstein;Journal of Economic Perspectives,1992