Cost of illness and contingent valuation: controlling for the motivations of expressed preferences in an attempt to avoid double-counting

This paper addresses the issue of double counting of health impacts in the context of cost of illness valuation. Double counting occurs when estimates are jointly used, which rely on valuation techniques that overlap. As a solution, we propose to limit the scope of each of the valuation method to a specific range of impacts. In order to limit the contingentvaluation method to the exclusive valuation of intangible costs, we propose a three steps approach : (1) leave the respondents free to valuate the consequences which matter to them, (2) elicit respondent's motivations, (3) control for the influence motivations have on elicited values. This procedure was applied in a Swiss contingent-valuation. An econometric treatment was applied in order to limit the scope of the estimates of the contingent valuation method to intangibles, therefore the possibility to a combination of methods with the risk of double-counting and underestimating costs being kept to a minimum.

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In: Economie publique/Public economies. - No 12 (2003/1), p. 179-200
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