Increasingly, the assessment of health prevention policies is evaluated through willingness to pay (wtp) surveys. When the evaluation deals with policies with a public dimension, the individual?'s stated wtp can reflect an altruistic component, which may alter the results of the economic...

Most of population health surveys appeal to proxy respondents, when surveyed persons with poor health are not able or do not want to answer the questionnaire by themselves. Yet, it may give rise to a strong endogeneity problem since the use of a proxy respondent is likely to be linked to...