SESGOS SOBRE LA INFORMACIÓN OBTENIDA Y LA ESTIMACIÓN DE BENEFICIOS EN ENTREVISTAS A VISITANTES DE UN ESPACIO NATURAL ABSTRACT In this paper we analyse and adjust the biases derived from using an on-site sample to infer to a population of users. The biases are important as regards the description of the socioeconomic profile of the user and the expected demand for trips. However, they are not significant as regards welfare inference, neither using the travel cost method in its zone version, nor using the contingent valuation method in its single-bounded version. Classification-JEL :
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KeywordsNatural areas; Travel cast method; on-site sample.;
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