Now you can truly understand and apply the latest economic models as you work directly with theoretical tools, real-world applications and popular new behavioral economics in this reader-friendly, market-leading book. Nicholson/Snyder's "Microeconomic Theory: Basic Principles & Extensions" 13th Edition, takes a calculus-based approach to provide the ideal level of mathematical rigor, whether you are an upper-level undergraduate or beginning graduate student. Insightful graphic presentations help you visually grasp the connections between the calculus and the algebraic and geometric approach to the same material. End-of-chapter problems present simple numerical/mathematical exercises, which strengthen your microeconomic intuition and are followed by more analytical, theoretical, behavioral and complex problems. The text closely connects all theory to real applications in the world today.