* We wish to thank our colleagues at INRA-LEA for their comments on the experimental design during a pilot study. We also thank 2 referees, J. Abbring, O. Ashenfelter, H. Houba, I. McAvinchey, L. Muus, D. Reiley, and Q. Vuong for many helpful suggestions and remarks. Financial support from INRA (AIP Consommation et Comportement Alimentaire) is gratefully acknowledged.
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