Beck, J., M. Grajek, C. Wey (2005). Hypermarket Competition and the Diffusion of Retail Checkout Barcode Scanning. WZB Discussion Paper SP II 2005-19.
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Beck, Jonathan, Michal Grajek and Christian Wey (2005), Hypermarket competition and the diffusion of retail checkout barcode scanning, CEPR Discussion Paper 5386.
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Beck, J., Grajek, M., Wey, C. (2005). Hypermarket Competition and the Diffusion of Retail Checkout Barcode Scanning. WZB Discussion Paper SP.
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