Various factors are taken into consideration when calculating the income distribution, out of which the nominal income is most common. Aside form this, attention should be given to consumption levels of both subsidy products (food, clothing, housing) as well as to luxury products and services. In addition, several social and demographic criteria of the population must be considered, such as the level of education, housing facilities (personal property or rental), industry in which the population activates (manufacturing, services, Information Technology or agriculture) and working and social conditions, such as access to housing or education. Also, political and economical factors must be taken into consideration, including international trade policies, governmental regulations, competition on the market or unemployment rate.

All statistical observations and analyses point out the sad fact that the American incomes are extremely unevenly distributed. "A statistical summary of U.S. family income distribution since World War II shows the following:...
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