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Appropriate Payment Vehicles in Stated Preference Studies in Developing Economies

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Abstract

Selecting appropriate payment vehicles is critical for the perceived consequentiality and incentive compatibility of stated preferences surveys. We analyze the performance of three different payment vehicles in a Malaysian case of valuing wetland conservation. Two are well-known: voluntary donations and income taxes. The third is new: reductions in government subsidies for daily consumer goods. Using donations is common, but this payment vehicle is prone to issues of free-riding. An income tax usually has favorable properties and is commonly used in environmental valuation. However, in Malaysia as well as in many other low- to middle-income economies, large proportions of people do not pay income taxes, putting the validity of this payment vehicle into question. Instead, citizens in Malaysia and many other countries benefit from subsidies for a range of consumer goods. We find that price sensitivity is higher and the unexplained variance smaller when using subsidies rather than donations or income taxes. Importantly, this approach translates into completely different conclusions concerning policy advice. Our results suggest that in developing countries, using reduced subsidies as a payment vehicle may have favorable properties in terms of improved payment consequentiality compared to alternative payment vehicles, thus enhancing the external validity of stated preference surveys.

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Notes

  1. For simplicity, we assume that our respondents perceive the elicitation as policy consequential, or at least that the perceptions of policy consequentiality do not differ across payment vehicle treatments.

  2. Controlled goods were declared in Malaysian law under the Control of Supplies Act 1961. The list of controlled goods can be retrieved from the official website of the Ministry of Domestic Trade, Co-operatives, and Consumerism Malaysia (http://www.kpdnkk.gov.my/index.php/en/list-of-controlled-goods/28-pengguna/194-).

  3. The data collection was undertaken with the help of trained research assistants under the instruction of the lead author. The assistants were instructed to randomly assign respondents to payment vehicle treatments. However, in the initial phase of the data collection, a couple of assistants misunderstood this instruction, which unfortunately led them to assign only two of the treatments. Despite the fact that this mistake was quickly identified and corrected, it did cause a small imbalance in the sub-samples, as is evident from Table 2.

  4. We initially estimated separate models, but we found the attribute parameter estimates to be quite similar in terms of signs and significance. However, due to the confounding scale parameter (which Table 3 shows to differ across samples), comparing the parameter estimates across samples would be inappropriate. The model using the pooled data in Table 3 enables a direct test of our hypothesis concerning the price parameters and scale differences in a single model. However, the WTP estimates presented in Table 4 are based on separate models estimated on the individual payment vehicle samples, and the patterns there support our choice.

  5. Due to normalization, the relative error term variance is calculated as \(\sigma ^{2}=1/{\lambda ^{2}}\).

Abbreviations

SP:

Stated preference

DCE:

Discrete choice experiment

WTP:

Willingness to pay

RP:

Revealed preference

RPL:

Random parameter logit

SD:

Standard deviation

SW:

Setiu Wetland

CI:

Confidence interval

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Acknowledgements

The authors acknowledge the help of reviewers and the editor in improving the manuscript. We acknowledge the financial assistance from of Universiti Putra Malaysia and Ministry of Higher Education Malaysia. A support from the research group of Responsible Rural Tourism Network and Ministry of Higher Education’s (Malaysia) Long Term Research Grant Scheme (LRGS) Programme [Reference No: JPT.S (BPKI) 2000/09/01/015Jld.4 (67)]. B. J. Thorsen further acknowledges the support from the Danish National Research Foundation (Centre of Excellence Grant DNRF 96).

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Correspondence to Suziana Hassan.

Appendix

Appendix

The actual descriptions of the payment vehicles presented to respondents (translated from the Malay language)

PaymentVehicle

Description of conservation cost

Subsidy

(1) A policy to implement a conservation program for this wetland will require funding for the costs of the program. The government is planning to do so by lowering the current subsidies for groceries such as flour, cooking oil, liquid natural gas, and fuel and to use the freed funds to implement the conservation program. Thus, the different alternative policies will incur a necessary yearly cost to your household, as you will have to pay more for these everyday goods that will now be less subsidized

(2) The possible amounts that this additional expense may cost your household are stated below:

RM 0/year, RM 5/year, RM 10/year, RM 30/year, RM 90/year, RM 210/year, RM 400/year

(3) Here, we’d like to ask your opinion about some of these attributes for the conservation of the SW. If adopted, it would be financed through sources that will eventually reduce your household’s income

(4) We will ask you to compare two alternative management policies along with the current state and to tell us which one you would support in practice

(5) Please also consider your choices under the precondition that if implemented, the payments will be made through a reduction in subsidies for fuel, groceries, etc. enjoyed by you and other households. In other words, these goods will become more expensive to buy, so you would have to spend the additional specified amount per year on these goods

(6) The results of this survey are advisory. In other words, they will be used to inform policymakers on the opinions and preferences of Malaysians to help them see how important conservation of the SW is and how it can be improved

(7) Please think carefully about how much you can really afford through subsidy reductions. You can also choose not to pay if you think that you can’t afford it and you prefer to spend your income on other things

Donation

(1) A policy to implement a conservation program for this wetland will require funding for the costs of the program. The government is planning to do so by raising the funds through voluntary donations and using the freed funds to implement the conservation program. Thus, the different alternative policies will incur a necessary yearly cost to your household, as you will have to give some of your income to that fund

(2) Similar to subsidy version

(3) Similar to subsidy version

(4) Similar to subsidy version

(5) Please also consider your choices under the precondition that if implemented, the payments will be made through the fund from voluntary donations by your household (and other households)

(6) Similar to subsidy version

(7) Please think carefully about how much you can really afford if you need to provide a voluntary donation. You can also choose not to pay if you think that you can’t afford it and you prefer to spend your income on other things

Income tax

(1) A policy to implement a conservation program for this wetland will require funding for the costs of the program. The government is planning to do so by increasing/charging an income tax and using the freed funds to implement the conservation program. Thus, the different alternative policies will incur a necessary yearly cost to your household, as you will have to pay more in income taxes

(2) Similar to subsidy version

(3) Similar to subsidy version

(4) Similar to subsidy version

(5) Please also consider your choices under the precondition that if implemented, the payments will be made by increasing or levying income taxes on your household (and other households)

(6) Similar to subsidy version

(7) Please think carefully about how much you can really afford if you experience an increase in your income taxes. You can also choose not to pay if you think that you can’t afford it and you prefer to spend your income on other things

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Hassan, S., Olsen, S.B. & Thorsen, B.J. Appropriate Payment Vehicles in Stated Preference Studies in Developing Economies. Environ Resource Econ 71, 1053–1075 (2018). https://doi.org/10.1007/s10640-017-0196-6

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