Testing the effectiveness of the oath script in reducing the hypothetical bias in the Contingent Valuation Method  

https://doi.org/10.17221/174/2015-AGRICECONCitation:De-Magistris T., Akaichi F., Ben Youssef K. (2016): Testing the effectiveness of the oath script in reducing the hypothetical bias in the Contingent Valuation Method  . Agric. Econ. – Czech, 62: 378-384.
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The objective of the study is to investigate the effect of the oath script (HO) in an hypothetical Contingent Valuation survey in a Mediterranean country (e.g. Italy). Hence, there were conducted the CE surveys with three treatments: (1) CV without a cognitive task, (2) CV with a CT script, and (3) CV with a HO. The findings showed that the effectiveness of the HO script depends on the participants’ socio-demographic characteristics. For instance, it was found that the HO script could help to reduce the hypothetical bias for people who possess a high educational level in contrast with those people with low education and low income. Hence, the findings suggest that the oath script not only does not a guarantee the reduction of the hypothetical bias, but it also does not explain the mixed results found in the previous studies.
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