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Deliberation is expected to enhance the validity and/or the democratic status of stated preference methods. Those objectives are challenged by the potential presence of group effects. Deference to the information publicly announced by others and social pressures to conformity hinder people’s ability to express reflective and independent preferences. Through a split sample contingent valuation survey, we tested whether participating in group discussion affects willingness to pay (WTP). We also test for the presence of group effects. Participants in group discussion stated a higher WTP, and we did not find evidence of group effects. These results are favorable to the deliberative project  La valoracion deliberativa ha sido propuesta para mejorar la validez y el estatus democratico de los metodos de preferencias declaradas. La presencia de efectos grupales pone en duda la realizacion de estos objetivos. Falencias informativas y presiones sociales dificultan la expresion autonoma de preferencias. Se aplico una encuesta de valoracion contingente siguiendo un procedimiento cuasi-experimental con el proposito de estimar el efecto de la deliberacion en la DAP y detectar la presencia de efectos grupales. Se observo una mayor DAP para los participantes en deliberacion, la cual no estuvo acompanada de efectos grupales. Estos resultados son favorables a la deliberacion.

Going along with the crowd? The importance of group effects for environmental deliberative monetary valuation