Pareto, Vilfredo, 1848-1923, Italian economist and sociologist, b. Paris, of an exiled noble family that returned to Italy in 1858. He studied mathematics and engineering in Turin and worked as an engineer for many years, meanwhile becoming increasingly interested in social and economic problems. His economic writings won him (1893) a professorship of political economy at the Univ. of Lausanne. His notable contribution in applying mathematics to economic theory is found especially in Cours d'économie politique (1896-97). In his sociological studies he sought to differentiate the rational and nonrational factors in social action. He used that concept as the basis for his theory of the cyclical development and fall of governing elite groups. One of the originators of welfare economics, he defined total welfare as an improvement in a person's condition that was not achieved at any other person's expense. His chief work in sociology, Trattato di sociologia generale (1916), has been translated as Mind and Society (4 vol., 1935).

(born July 15, 1848, Paris, France—died Aug. 19, 1923, Geneva, Switz.) Italian economist and sociologist. Educated at the University of Turin, he worked as an engineer and later served as a director of a large Italian railway. He taught at the University of Lausanne from 1893. His law of income distribution used a complex mathematical formula to trace historical patterns in the distribution of wealth. In 1906 he laid the foundation of modern welfare economics with his Pareto Optimum, which stated that a society's resources are not optimally allocated as long as it is possible to make at least one person better off while keeping others as well off as before.

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Pareto can refer to:

• Vilfredo Pareto (1848–1923), Italian sociologist, economist and philosopher;
• Paula Pareto (born 1986), Argentine judoka

Several things named after Vilfredo Pareto:

• Pareto chart, an ordered bar chart used in statistical quality assurance
• Pareto distribution, a power law probability distribution
• Pareto efficiency, or Pareto optimality, a concept in economics
• Pareto index, a measure of the breadth of income distribution in economics
• Pareto principle, also known as the 80-20 rule

Or:

• Pareto (AL), a town in Italy
• Pareto Group, a Norwegian finance company