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J. Le Grand (2003), Motivation, Agency, and Public Policy: Of Knights and Knaves, Pawns and Queens , Oxford University Press, Oxford. R. Lister (2004), Poverty , Polity Books, Cambridge. L. Mead (2004), Government Matters: Welfare Reform in Wisconsin , Princeton University Press, Princeton and Oxford.
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Alan Deacon (2004) studied this question.
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