“One of Pareto’s most noteworthy and controversial theories is that human beings are not, for the most part, motivated by logic and reason but rather by sentiment.”

Coming from an engineer – Pareto had started as one, this concept becomes even more noteworthy.
Why would a ‘professional using precision measurements and seeking consistently reproducible results’ focus his attention on sentiment rather than reason?

Because this is the reasonable thing to to?

And one of the reasons for which I tend to agree with him – besides being an engineer myself, is that he had started his studies using the most ‘reasonable’ instrument ever devised by man: “Residing in Florence, he studied philosophy and politics and wrote many periodical articles in which he first analyzed economic problems with mathematical tools.”

So, Pareto had reached the conclusion that human beings are driven mostly by sentiment after rationally analyzing the economic (and political) life.

OK. But what lies behind ‘sentiment’?

Pareto had proposed ‘residues’ as ‘motivation’ for sentiment. His theory is interesting only rather complicated. Almost byzantine. A well written summary can be read here.

What I find fascinating about Pareto’s theory is the rather veiled but certain correspondence which exists between his ‘residues’ and Maslow’s “hierarchy of needs”.

I’ll try to ‘raise the veil’ at a later date, today I’ll just point you towards a very relevant ‘coincidence’.

The psychologist had traveled the same road as the engineer.

Maslow (1943) initially stated that individuals must satisfy lower level deficit needs before progressing on to meet higher level growth needs. However, he later clarified that satisfaction of a needs is not an “all-or-none” phenomenon, admitting that his earlier statements may have given “the false impression that a need must be satisfied 100 percent before the next need emerges” (1987, p. 69).

Both had started ‘deterministically’, trying evidentiate ‘the’ (ironclad?) link between behavior and conditions – and expecting that link to be of a rational nature, only to reach the conclusion that individual sentiment/evaluation is at least as important – if not more so, as reason in the decision process. In shaping human behavior.