Prior to the Week 4 assignment, read Chapters 9, 10, and 11 in your textbook. Use the Company Amazon for the Week 4 assignment. 1.) Distinguish among four market structures: perfect competition, monopolistic competition, oligopoly, and monopoly in this order. 2.) Identify Amazon's market structure (i.e., perfect competition, monopolistic competition, oligopoly, and monopoly).Explain your reasoning. 3.) Examine whether competitive pressures are present in Amazon's industry with high barriers to entry. 4.) Evaluate how high barriers to entry into the industry may influence Amazon's long-run profitability. 5.) Explain the price elasticity of demand in Amazon's market structure and its effect on Amazon's pricing decision