ABSTRACT
Pareto's negative evaluation of rhetoric reverberates in his article on 'The New Theories of Economics'. In it, Pareto states that rhetoric pertains to the domain of art, not to the domain of science. This chapter introduces Pareto's theory of derivations and supplies a transition from the second volume, which is entitled 'Analysis of Sentiment' and is devoted to the presentation of his theory of residues. It explains what is meant by 'residues' and 'derivations' and how they relate to the fundamental Paretian issue of the non-logicality of a hefty proportion of human agency, before tackling Pareto's more explicit consideration on rhetoric in 'Sentiment in Thinking'. Aristotelian enthymemes may be something that Pareto does not like very much, yet they can still be useful to articulate and explain Pareto's own theory of residues and derivations.
