Present today’s most cutting-edge treatment of microeconomics with the proven market leader -- MICROECONOMIC THEORY: BASIC PRINCIPLES AND EXTENSIONS. Now even better, this 12th edition offers a level of mathematical rigor ideal for upper-level undergraduate or beginning graduate students. This edition provides clear, accurate coverage of advanced microeconomic concepts while illustrating how theory applies to practical situations Readers work with theoretical tools, real-world applications, new behavioral economics problems, and the latest developments in microeconomics. The book’s unique presentation even helps build student intuition with highly-acclaimed, two-tier end-of-chapter problems that begin with simple numerical/mathematical exercises followed by more analytical, theoretical, complex, and behavioral economics problems.