Abstract
It is a well-known empirical finding that some percentage of respondents participating in Stated Preference surveys will not give responses that reflect their true preferences. One reason is protest behaviour. If the distribution of protest responses is not independent of respondent or survey characteristics, then simply expelling protesters from surveys can lead to sample selection bias. Furthermore, WTP estimates will not be comparable across surveys. This paper seeks to explore potential causes of protest behaviour through a meta-study based on full datasets from 38 different surveys. The objective of the study is to examine the effect of respondent specific variables as well as survey specific variables on protest behaviour. Our results suggest that some of the differences in WTP typically observed between different demographic groups, different elicitation formats and different question formats might actually be attributed to inherent differences in the propensity to protest. Our results indicate that the propensity for respondents to exhibit protest behaviour when asked a stated preference type valuation question depends on a number of specific factors, respondent specific as well as survey specific—knowledge which could be used in order to reduce protest behaviour.
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Notes
This is also the reason why we have chosen to refer to our approach a meta-study rather than a meta-analysis since we are modeling on full datasets rather than meta-data.
The indication of not being willing to pay naturally differed across question formats. In OE-CVM a zero WTP bid served as an indicator of not being willing to pay whereas a “No” response were used in DC-CVM. In CE, respondents consistently choosing the status quo in all choice tasks were treated as not being willing to pay, and thus being potential protesters.
Typically, conformity effects in SP surveys are thought of as affecting positive bids in terms of respondents adjusting their own WTP statements relative to the WTP statements of others (Alpizar et al. 2008). The situation we describe here would be a sort of second best conformity effect: Due to budget constraints, the zero bidders have already decided not to conform to the social norm which would be to state a positive bid. However, they might think that stating budget constraints as the reason for a zero bid might make others think less of them, and, hence, they pick some other reason. Choosing a protest reason indicates that a zero bid might not be the respondent’s true WTP. In that sense, this could be a way of signaling that you might conform to the social norm of paying for the good, but you just do not conform to the premises of the survey.
As noted by a reviewer, all the surveys used here are potentially prone to sample self-selection bias. In particular, it is likely that users of a good will be more inclined to participate in a survey than non-users. Our model assumes independence between the survey level random error and the respondent level random error. As such it does not take into account the potential endogeneity (for instance between use of the good and the type of good) that could emerge as a result of such self-selection bias.
We consider this measure more precise than simply looking at the number of questions since a question can contain several items, and the more items, the higher the cognitive load.
It should be noted that this is relative to a 0 % protest rate in the personal interviews.
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Acknowledgments
We are indebted to the following who graciously supplied us with datasets: Anna Bartczak, Mikołaj Czajkowski, Klaus Glenk, David Hoyos, Tobias Wronka, Berit Hasler, Marianne Källstrøm, Andreas Kamp and Ole Bonnichsen. We further thank participants at the WCERE 2010 and EAERE 2012 conferences as well as the editor and reviewers for their helpful comments and suggestions.
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Appendix A
Appendix A
See Table 4.
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Meyerhoff, J., Mørkbak, M.R. & Olsen, S.B. A Meta-study Investigating the Sources of Protest Behaviour in Stated Preference Surveys. Environ Resource Econ 58, 35–57 (2014). https://doi.org/10.1007/s10640-013-9688-1
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DOI: https://doi.org/10.1007/s10640-013-9688-1
Keywords
- Protest behaviour
- Stated preferences
- Survey design
- Willingness to pay
- Hierarchical logistic regression
- Mixed effects