Having introduced Pareto's work, in the second chapter his sociological sentiments and reasons theory will be investigated, mainly from three elements: non-logic actions, residues and derivations. By that investigation, it is expected that some elements may clarify the complex relation of reason and emotion in human decision making.
From the analysis of residues and derivations, Pareto wanted to comprehend the paradox of human behavior.
The main goal in his sociological work was to understand how economics, politics and society function in interdependency--how a society maintains certain equilibrium, based on what he calls residues and derivations. Pareto has a cyclical approach to sociology, unlike authors that defend a progressive history, like eschatological philosophers of the "end of times", such as Hegel, Marx and Fukuyama.