Scope effects of respondent uncertainty in contingent valuation : evidence from motorized emission reductions in the city of Nairobi, Kenya
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Date
Authors
Ndambiri, Hilary
Mungatana, Eric Dada
Brouwer, Roy
Journal Title
Journal ISSN
Volume Title
Publisher
Taylor and Francis
Abstract
This study analyzed the scope effects of respondent uncertainty in contingent valuation (CV)
by evaluating whether willingness to pay (WTP) estimates were sensitive to changes in the
magnitudes of motorized emission reductions in the city of Nairobi, Kenya. The WTP
estimates were elicited through the conventional payment card (PC), stochastic payment card
(SPC) and the polychotomous payment card (PPC) formats. While SPC and PPC formats
were used to capture respondent uncertainty, the PC format captured respondent certainty
regarding the amounts individuals were WTP for emission reductions. Based on parametric
and nonparametric analysis, the results show that certain (PC) respondents stated
significantly larger WTP amounts for larger emission reductions than for smaller reductions.
Conversely, uncertain (SPC and PPC) respondents stated smaller amounts for larger
emission reductions than certain (PC) respondents. The implication is that though
respondents were sensitive to the scope of motorized emission reductions, respondent
uncertainty lowered their sensitivity to scope.
Description
Keywords
Respondent uncertainty, Scope sensitivity, Valuation formats, Motorized emission reductions, Contingent valuation (CV), Willingness to pay (WTP), Payment card (PC), Stochastic payment card (SPC), Polychotomous payment card (PPC)
Sustainable Development Goals
Citation
Hilary Ndambiri, Eric Mungatana & Roy Brouwer (2017) Scope effects of
respondent uncertainty in contingent valuation: evidence from motorized emission reductions in
the city of Nairobi, Kenya, Journal of Environmental Planning and Management, 60:1, 22-46, DOI:
10.1080/09640568.2016.1140024.