In previous literature, WTP values have been estimated using Discrete Choice Experiments (DCE) capturing spatial heterogeneity mostly relating to direction, location (e.g. water quality across upper vs lower river basins), rural vs urban areas, agriculture vs forest areas, different disimilar alternatives (e.g. mud flates, beaches & estuaries of a river delta), etc. However, Time-scale validity has never been checked to assess whether preferences and WTP values remain similar over time, say few years. Knowing that population structure and trends change over time, checking Time-scale valudity is very important, if not; the reliability of benefit-transfer will be then questioable when the related development project is complete after some time period, say few years.
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Here, I meant Time-scale validity = Temporal validity (i.e. test retest validity), a type of external validity using the same research methods and collecting data either from the same (i.e. within sample) or different respondents (i.e. across samples). Schaafsma et al. (1994) suggest that WTP values vary over time that poses a challenge for cost-benefit analysis.
Dear Cordula
If you have carefully read my discussion, I rather suggested about doing research in the future which can assess Temporal Validity of two Spatial Heterogeneity studies, say over 3-4 years ! I did not ask any question, but started this discussion as it has a great future scope.
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