Giving Stated Preference Respondents "Time to Think": Results From Four Countries
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2012-04-01
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Previous studies have found that contingent valuation (CV) respondents who are given overnight to reflect on a CV scenario have 30-40% lower average willingness-to-pay (WTP) than respondents who are interviewed in a single session. This "time to think" (TTT) effect could explain much of the gap between real and hypothetical WTP observed in experimental studies. Yet giving time to think is still rare in binary or multinomial discrete choice studies. We review the literature on increasing survey respondents' opportunities to reflect on their answers and synthesize results from parallel TTT studies on private vaccine demand in four countries. Across all four countries, we find robust and consistent evidence from both raw data and multivariate models for a TTT effect: giving respondents overnight to think reduced the probability that a respondent said he or she would buy the hypothetical vaccines. Average WTP fell approximately 40%. Respondents with time to think were also more certain of their answers, and a majority said they used the opportunity to consult with their spouse or family. We conclude with a discussion of why researchers might be hesitant to adopt the TTT methodology. © 2011 Springer Science+Business Media B.V.
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Cook, J, M Jeuland, B Maskery and D Whittington (2012). Giving Stated Preference Respondents "Time to Think": Results From Four Countries. Environmental and Resource Economics, 51(4). pp. 473–496. 10.1007/s10640-011-9508-4 Retrieved from https://hdl.handle.net/10161/5985.
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Marc A. Jeuland
Marc Jeuland is a Professor in the Sanford School of Public Policy, with a joint appointment in the Duke Global Health Institute. His research interests include nonmarket valuation, water and sanitation, environmental health, energy poverty and transitions, trans-boundary water resource planning and management, and the impacts and economics of climate change.
Jeuland's recent research includes work to understand the economic implications of climate change for water resources projects on transboundary river systems, a range of primary data collection projects related to analysis of adoption of environmental health improving technology, and analysis of the costs and benefits of environmental health interventions in developing countries. He has conducted multiple field experiments on issues such as: the role of water quality information in affecting household water and hygiene behaviors; the demand for, and impacts of cleaner cookstoves on household well-being; the long-term sustainability and effects of rural sanitation and water supply projects. He has also collected data on preferences for a range of environmental health improvements including cholera vaccines, household water treatment technologies and improved cookstoves. In the energy and development domain, he is currently working on several projects with the Energy Access Project at Duke, and is a co-founder of the Sustainable Energy Transitions Initiative (SETI), along with Professor Subhrendu Pattanayak and scholars from Chile, China and Ethiopia. His energy portfolio includes work related to evaluation of cleaner cooking interventions, measuring energy access and reliability, and reviews of the drivers and impacts literature related to energy.
Jeuland has worked in the past with the World Bank, USAID, the Millennium Challenge Corporation, UNICEF, and many field-based NGOs and community-based implementing organizations.
Prior to his graduate studies and work with the World Bank, Jeuland was a Peace Corps volunteer in Mali, West Africa, where he designed and monitored construction of a pilot wastewater treatment system and trained management personnel at the plant’s managing firm.
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