Aristotle begins by defining the city and political society, arguing that man is naturally a political animal whose ultimate goal is the good life. He distinguishes political rule from domestic management, analyzing the relations between master and slave, husband and wife, and parent and child, while also examining property acquisition and household economy. The treatise then critiques previous political theorists, including Plato, and evaluates existing constitutions such as those of Sparta, Crete, and Carthage to uncover their practical strengths and weaknesses.
Moving beyond ideal frameworks, the author provides a detailed survey of actual states, classifying them into monarchies, aristocracies, and constitutional governments, along with their perverted counterparts: tyrannies, oligarchies, and democracies. He investigates the causes of instability and revolution within these systems, attributing political upheaval largely to economic inequality and the struggle for power between the rich and the poor. By analyzing the balance of power, Aristotle demonstrates how mixed constitutions, particularly those supported by a robust middle class, can achieve greater stability and longevity.
The work further delves into the mechanics of governance, examining the division of power among public assemblies, administrative offices, and judicial tribunals. It addresses the fundamental question of who should hold supreme authority, weighing the merits of rule by law versus rule by individual virtue. Throughout the text, the argument develops from abstract philosophical principles regarding human nature and justice into a pragmatic handbook for the statesman and legislator, offering concrete methods for establishing, reforming, and preserving political institutions across diverse societal conditions.