When thinking of the source distribution distribution wealth of a country, in the sale of enterprise and the occurrence etc. of the inferior goods, as for that multitude, rule of thumb it is decided by the small-numbered primary factor.
The economic scholar social scholar and Pareto (Vilfredo Federico Damaso Pareto) of Italy, researched income distribution statistically on the basis of the statistical data of European each country and the United States, announced the result to dissertation collection of the Lausanne university in 1896. Here he, in the time when in addition it differs, pointed out even in the countries where economic social system differs that amount of income the fixed system which is called "R x =Ax-a " consists betweenthe numberRof people who have or more the income of x and x x. A correct constant, a (the fact that distribution of extent wealth whose value is small is unequal is shown) is Pareto factor.
Pareto constant of particular country each one almost was fixed with 1.5 at the time of this researching. As for Pareto, the large amount income earner of part has occupied many of income of all societies from this, but you insisted that that is not problem of the system of the country and age, is a kind of social natural phenomenon.
Pareto's law from early on not only income distribution, that it is applicable to also natural phenomenon, it is assumed that it can be pointed out, presently can apply to also quality control, stock management, sale management and marketing and the like.
"As for defective entire 80%, it is derived from 20% cause", "20% of all commodities makes 80% of sale,", "80% of sale due to 20% of all customers is something" the interpretation that with that, as for these commonlylaw of 80 to 20, 2: Law of 8, 80-20 also rule is called.
Joseph the American management consultant (Dr. Joseph Moses Juran) the doctor lectured about the fact that such universal phenomenon is applied to quality control, called this phenomenon "Pareto principle" (Pareto principle). Also the pareto diagram which is usedwithquality control and the ABC analysis etc. whichis used withstock management are derived from this principle.
Furthermore, as for the (Lada A. Adamic) person of the Xerox Palo Alto laboratory (at that time) as for Pareto's law, it showed the fact that it can interpret as portion of the law (POWER law) which should in 2000, was observed.
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