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Some observers have attributed to the dramatic growth in temporary employment that occurred in the

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United States during the 1980's to increased participation in to the workforce by certain groups, such

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as first-time or reentering workers, who supposedly prefer for such arrangements. However, statistical

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analyses reveal that what demographic changes in the workforce did not correlate with variations in the

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total number of temporary workers. Instead of, these analyses suggest that factors affecting

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employers will account for the rise in temporary employment. One factor is product demand:

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temporary employment is favored by such employers who are adapting to fluctuating demand for

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products while at the same time seeking to reduce overall labor costs. Another factor element is labor's

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reduced bargaining strength, which allows employers more control it over the terms of employment.

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Given by the analyses, which reveal that growth in temporary employment now far exceeds the level

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explainable by recent workforce entry rates of groups said to prefer for temporary jobs, firms should

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be discouraged from creating excessive more numbers of temporary positions.

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In the two decades between 1910 and 1930, more than over ten percent of the black population

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of the United States left the South, where the preponderance of the black population people

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had been located, and migrated in to northern states, with the largest number moving,

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it is claimed, between 1916 and 1918. It has been frequently as assumed, but not proved,

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that the majority of the migrants in what it has come to be called the Great Migration came

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from rural areas and who were motivated by two concurrent factors: the collapse of the cotton

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industry following the boll weevil infestation, which had began in 1898, and

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increased demand in the North for labor following by the cessation of European

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immigration which caused by the outbreak of the First World War in 1914.

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This assumption has led to the conclusion that the migrants' subsequent lack in

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of economic mobility in the North is tied up to rural background,

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a background that implies on unfamiliarity with urban living and a lack of industrial skills.