Conceptual Framework of Microeconomic Theory. The Consumer. The Producer. Optimum Theory. Competitive Equilibrium. Imperfect Competition and Game Situations. Economies with an Infinite Number of Agents. Determination of an Optimum. External Economies, Public Goods, Fixed Costs. Intertemporal Economies: (a) a Date for Each Commodity; (b) Production Specific to Each Period. Uncertainty. Information. Appendix: The Extrema of Functions of Several Variables With or Without Constraint on the Variables (J.-C. Milleron). Index.