@article{ref1,
title="Countering demand for ineffective health remedies: do consumers respond to risks, lack of benefits, or both?",
journal="Psychology and Health",
year="2020",
author="MacFarlane, Douglas and Hurlstone, Mark J. and Ecker, Ullrich K. H.",
volume="ePub",
number="ePub",
pages="ePub-ePub",
abstract="OBJECTIVE: We tested whether targeting the illusion of causality and/or misperceptions about health risks had the potential to reduce consumer demand for an ineffective health remedy (multivitamin supplements).<br><br>DESIGN: We adopted a 2 (contingency information: no/yes) × 2 (fear appeal: no/yes) factorial design, with willingness-to-pay as the dependent variable. The contingency information specified, in table format, the number of people reporting a benefit vs. no benefit from both multivitamins and placebo, plus a causal explanation for lack of efficacy over placebo. The fear appeal involved a summary of clinical-trial results that indicated multivitamins can cause health harms. The control condition received only irrelevant information.Main outcome measure: Experimental auctions measured people's willingness-to-pay for multivitamins. Experiment 1 (N = 260) elicited hypothetical willingness-to-pay online. Experiment 2 (N = 207) elicited incentivised willingness-to-pay in the laboratory.<br><br>RESULTS: Compared to a control group, we found independent effects of contingency information (-22%) and the fear appeal (-32%) on willingness-to-pay. The combination of both interventions had the greatest impact (-50%) on willingness-to-pay.<br><br>CONCLUSION: We found evidence that consumer choices are influenced by both perceptions of efficacy and risk. The combination of both elements can provide additive effects that appear superior to either approach alone.<p /> <p>Language: en</p>",
language="en",
issn="0887-0446",
doi="10.1080/08870446.2020.1774056",
url="http://dx.doi.org/10.1080/08870446.2020.1774056"
}