Assuring finite moments for willingness to pay in random coefficient models

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A pooled RP/SP mode, route and destination choice model to investigate mode and user-type effects in the value of travel time savings (2019, background): “Axhausen) 1See also the work of DeSerpa (1971), Truong and Hensher (1985), Bates (1987) and, for a good theoretical overview of time use models, Jara-Diaz (2007).”
Correlation and scale in mixed logit models (2017, background): “…reason for implementing models in WTP-space is to estimate the distribution of WTP directly, rather than estimate the distribution of utility coefficients and then derive the implied distribution of WTP, which may be difficult or impossible with some choices of distributions (Daly et al., 2012).”
Choice experiment assessment of public preferences for forest structural attributes (2015, neutral): “ We also avoided relying on the Normal distribution for the cost coefficient as this would have led to undefined moments for the resulting WTP distributions (cf. Daly et al., 2012), using a negative Lognormal distribution instead.”