They are propositions that are motivated by economic reality as observable, not to mention controllable, as that may be, but they are no more and no less than comments about that economic reality and they emphatically are not descriptive assays of it.
This text presents a rigorous and reasonably complete statement of microeconomic theory as it exists today. It starts with a unified treatment of consumers' demand, followed by an exposition of the theory of production as well as costs and profit functions of competitive firms. …