211 pagesThis dissertation consists of three essays in the areas of Industrial Organization and Firm Dynamics and Trade, examining the interaction between firms’ decision-making and government policies in determining market outcomes and the welfare consequences.The first chapter studies how upstream market concentration and demand risk affect downstream firms’ outsourcing decisions. Firms’ boundary decisions are one of the most fundamental issues in economics. I focus on the volatile automobile industry and study how firms can use outsourcing to insure themselves against the demand risk. I formulate a structural model in which outsourcing allows the downstream firms to hedge the uncertain in-house production cost and upstream firms exploit ...