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Wealth concentration
Wealth concentration is a process by which newly created wealth, under some conditions, can become concentrated in the possession of wealthy individuals or entities. Those who hold wealth have the means to invest in newly created sources and structures of wealth, or to otherwise leverage the accumulation of wealth, and are thus the beneficiaries of even greater wealth.
==Economic conditions==
The first necessary condition for the phenomenon of wealth concentration to occur is an unequal initial distribution of wealth. The distribution of wealth throughout the population is often closely approximated by a Pareto distribution, with tails which decay as a power-law in wealth. (See also: Distribution of wealth and Economic inequality). According to PolitiFact and others, the 400 wealthiest Americans had "more wealth than half of all Americans combined." Inherited wealth may help explain why many Americans who have become rich may have had a "substantial head start". In September 2012, according to the Institute for Policy Studies, "over 60 percent" of the Forbes richest 400 Americans "grew up in substantial privilege".
The second condition is that a small initial inequality must, over time, widen into a larger inequality. This is an example of positive feedback in an economic system. A team from Jagiellonian University produced statistical model economies showing that wealth condensation can occur whether or not total wealth is growing (if it is not, this implies that the poor could become poorer).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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