Who wrote "by the time slum children are age six of seven, they have usually absorbed the basic values and attitudes of their subculture and are not psychologically geared to take full advantage of changing conditions or increased opportunities which may occur in their lifetime."?

The statement is written by an American anthropologist Oscar Lewis who is best known for his work and depictions of the lives of slum dwellers. Among his famous work are the books named "The children of Sanches, Lavida and five families.

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