23 IZA Discussion Papers
IZA Discussion Paper No. 6143
IZA Discussion Paper No. 4396
substantially revised and rewritten version available as IZA DP No. 5481
IZA Discussion Paper No. 742
published in: Luigino Bruni and Pierluigi Porta (eds.), Economics and Happiness: Framing the Analysis, Oxford University Press, 2006
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