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Vilfredo Pareto

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Vilfredo Pareto (1848-1923) made several important contributions to economics, especially in the study of income distribution and in the analysis of individuals' choices. He introduced the concept of Pareto efficiency and helped develop the field of microeconomics with ideas such as indifference curves.

He is well known for the observation that 20% of the population owned 80% of the property in Italy, later generalised (by Joseph Juran and others) into the Pareto principle, and generalised further to the concept of a Pareto distribution.

The Pareto index is a measure of the inequality of income distribution.

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