Principles of Microeconomics 9th edition focuses on the 10 core principles of economics to provide you with a clear understanding of the discipline. With an approachable, student-friendly writing style this resource will help you to quickly grasp economic concepts and build a strong understand of how economics applies to the real world. MindTap resources for students include concept clips, graph builder, Aplia problem sets, interactive quizzes, videos and video quizzes.