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Acknowledgements
I thank Melody Lu Chia-Wen and an anonymous reviewer (with helpful suggestions for further investigations) for comments on a previous version of the paper and Jeroen Windmeijer and Dianne van Oosterhout for institutional support. Furthermore I am grateful to the participants at the seminar ‘Unity in the Social Sciences?’ organised by the Graduate Journal of Social Science, 24-25 September 2004 at the London School of Economics, for their lively and thorough debates.