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Révélation du CAP : question ouverte ou question fermée ? Une application à la biodiversité des forêts riveraines de la Garonne


  • Caroline Gauthier


[eng] WTP Revelation: Open-Ended or Dichotomous-Choice Questions? An Application to the . Biodiversity of the Garonne River Forests . by Caroline Gauthier . This paper offers a contingent valuation of individuals' willingness to pay for preservation of biodiversity. It is the first study of its kind to be carried out in France. It has been conducted according to the rules proposed by the NOAA Panel, with the exception of the revelation method. The sample of 402 individuals interviewed was divided into those who declared their WTP on the basis of an open-ended question and those who declared it on the basis of a dichotomous-choice question. The two formats were then compared. The paper offers two tests demonstrating that the WTPs calculated by each method are not significantly different. Although the NOAA Panel recommends use of the closed format, this paper shows that use of the open-ended question is equally relevant and less expensive given the level of information required. [fre] Cet article présente une évaluation contingente du consentement à payer des individus pour la préservation de la biodiversité. C'est la première étude de ce type réalisée en France. L'étude est menée selon les règles proposées par le NOAA Panel, à l'exception de la méthode de révélation. L'échantillon des 402 individus interrogés est scindé entre ceux qui annoncent leur CAP suite à une question ouverte et ceux qui l'annoncent suite à une question fermée. Les deux formats sont ensuite comparés. L'article propose deux tests pour montrer que les CAP estimés par les deux méthodes ne sont pas significativement différents. Alors que le NOAA Panel préconise l'usage du format fermé, cet article montre que l'usage de la question ouverte est aussi pertinent et moins coûteux étant donné le niveau d'information souhaité.

Suggested Citation

  • Caroline Gauthier, 2000. "Révélation du CAP : question ouverte ou question fermée ? Une application à la biodiversité des forêts riveraines de la Garonne," Économie et Prévision, Programme National Persée, vol. 143(2), pages 237-245.
  • Handle: RePEc:prs:ecoprv:ecop_0249-4744_2000_num_143_2_6106
    Note: DOI:10.3406/ecop.2000.6106

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    References listed on IDEAS

    1. Thayer, Mark A., 1981. "Contingent valuation techniques for assessing environmental impacts: Further evidence," Journal of Environmental Economics and Management, Elsevier, vol. 8(1), pages 27-44, March.
    2. Spash, Clive L. & Hanley, Nick, 1995. "Preferences, information and biodiversity preservation," Ecological Economics, Elsevier, vol. 12(3), pages 191-208, March.
    3. Davidson, Russell & MacKinnon, James G., 1993. "Estimation and Inference in Econometrics," OUP Catalogue, Oxford University Press, number 9780195060119.
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