Contemporary Themes include the design of regulation under cost uncertainty using mechanism-design-inspired tools to align incentives with social welfare while guaranteeing nonnegative profits for regulated monopolists. The literature foregrounds bilateral monopoly dynamics, showing how input-market power and bargaining frictions shape merger incentives and competitive outcomes. A cautious stance toward aggressive competition policy emerges, with policy prescriptions linking merger motives to welfare outcomes and emphasizing principled intervention over reflexive antiselection.