Current projects

The Chimera of Willingness-to-pay for a Quality-Adjusted Life Year: Inconsistencies of Stated Preferences in Scenario Variations
Team:PD Dr. Lars Schwettmann 
Co-operation partner:Prof. Dr. Dr. Marlies Ahlert
Duration:2 years
Description:To measure their willingness-to-pay for a quality-adjusted life year (QALY) survey participants face hypothetical scenarios in which they can avoid health losses by paying an amount of money for a medical treatment. The scenarios are characterized and varied with respect to five attributes, viz. extent, duration and point in time of a health loss, (un-)certainty of the illness and form of payment. By this, it is investigated whether individual reactions to ceteris paribus variations of single attributes are consistent with common assumptions of economic theory.
Objectives:The aim of the project is to analyze the validity of established methods to determine willingness-to-pay for health gains. If respondents either ignore attribute changes or even react inversely to economic assumptions, neither the common extrapolation of marginal changes to one QALY nor the determination of ‘the’ willingness-to-pay for a QALY would seem to be consistently possible.
Methods:The dataset was collected within the GermanVaQ (German Value of a QALY) project financed by the German Research Foundation (DFG) with four representative samples of the German population (2012, 2014) including more than 5000 respondents. The surveys contain 6 pairs of scenarios which differ with respect to exactly one attribute specification. Based on standard assumptions of economic theory, hypotheses regarding willingness-to-pay reactions to each ceteris paribus variation are formulated and tested in a within-subject design.