"Lecture Notes in Microeconomic Theory" is the first publication of Ariel Rubinstein's lecture notes from the first part of his well-known course in microeconomic theory, which he has taught for fifteen years to first-year graduate students at Tel Aviv, Princeton, and New York universities. The book will be an invaluable supplement to primary textbooks in microeconomic theory. Conveying the style and method of Rubinstein's lectures, it will benefit teachers and research economists, as well as students. The book focuses on and provides a critical assessment of models of rational economic agents, and it contains a large number of original problems. Rubinstein, one of the world's most-respected economics theorists, has made substantial contributions to several fields in economics, particularly game theory. His work is characterized by an unusual combination of deep originality and surprising simplicity. He is probably best known for his contributions to the bargaining problem and, more recently, to bounded rationality.