This document appears to be a chapter from a student's paper on microeconomics. It includes: 1) An introduction to monopoly markets and their characteristics. 2) Explanations of monopoly price determination in the short and long-run. 3) Definitions and assumptions related to monopoly, oligopoly, and price determination under different market structures. 4) Discussions of concepts like marginal revenue, marginal cost, equilibrium, and the Sweezy model of the kinked demand curve for explaining price rigidity in oligopolies.