Markets are divided into four categories: perfect competition, monopolistic competition, oligopoly and monopoly. These structures can be identified by considering the two dimensions of competition: (1) the number of competing firms and (2) the extent of barriers to entry. Government regulation of industry is determined partly by market structure. Americans are conflicted about the role government should play in the marketplace. Do you think some industries need to be more regulated than others and why? Provide an example in your response.