The dissertation discusses issues in the field of industrial organization. When the government provides better infrastructure to competing firms for innovation, private firms' R&D expenditures are affected. When the government doesn't assure project completion, the uncertainty impacts private...

An abundant literature is concerned with the existence of equilibrium in incomplete markets where participation to financial markets is not restricted. To mention a few, Cass (1984), Werner (1985), Geanakoplos and Polemarchakis (1986), Duffie (1987), Duffie and Shafer (1985) and Magill and...