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Parsimony is a concept that has its origins in the latin word parcimonĭa and referring to calm in how to speak or act. The term can also refer to the capacity or the freshness of mind, tranquility or slow.
Examples: "I admire the parsimony of Rinaldi at the time to respond to stressful situations", "do not lose our parsimony: we have two points of advantage over our opponent and the match is over soon", "thanks to its questions, the journalist managed to surpass usual parsimony of the candidate.
That said, a parsimonious person is someone (wary) advised that manages to control his emotions and impulses. Usually, parsimony is associated with temperance, balance and control of the will.
Take the case of two people who are questioned by the police. Suppose that both are suspected of having committed a theft while they are, in fact, innocent. The first, under the pressure of the interrogators, in despair, sobbing and begins screaming claiming his innocence. The other, however, responds calmly and in peace, and presents all the evidence and reasons to prove his innocence. This last person is evidence of parsimony, unlike the first.
Another use of the concept of parsimony refers to moderation and frugality in expenditures (purchase of goods and services with restraint and moderation) and the philosophical precept known as principle of parsimony, or Occam's razor (which defends that if two theories with the same conditions produce the same consequences, it is the simplest theory which is more likely to be correct).