Experimental Design Details
***********************************
* 1. Conjoint Experiment: *
***********************************
[SURVEY PARTICIPANTS WILL GET THREE ROUNDS OF THIS QUESTION, EACH ONE WITH A DIFFERENT COMBINATION OF ATTRIBUTES]
"Let us imagine for a moment a hypothetical scenario wherein you have an extra S$50 to give to someone. You have a choice between two individuals, both of whom are completely hypothetical and not real people"
Characteristics to randomize:
a. Ethnicity (i) Chinese male name (ii) Malay male name (iii) Indian male name
b. Occupation (i) Janitor (ii) admin assistant (iii) senior surgeon
c. Household size (i) Lives with his partner and two children (ii) Lives with his partner, two children and in-laws
d. Recent situation (i) Just lost his job due to a sudden restructuring of the hospital he was working for (ii) Just lost his job due to repeated poor performance reviews
e. Nationality (i) Arrived to Singapore 5 years ago (Foreigner) (ii) Was born and raised in Singapore (Singaporean)
************************************
* 2. Donations experiment *
************************************
As part of this project, we will donate some funds to local NGO according to the preferences of participants. We are asking each participant which organization they would like to give a $10 donation. We will randomly select 100 survey respondents and make $10 contributions on their behalf, according to their choices.
If you were randomly selected, to which organization would you like us to make a donation of $10? Note: The donation will only be made if you are one of the randomly selected participants, and you will know at the completion of the survey if you are one of the randomly selected participants.
Please review the following options: [randomize the order of options]
Yayasan Mendaki (Council for the Development of Singapore Malay/Muslim community) https://www.mendaki.org.sg/ MENDAKI’s programmes assist students and individuals with education and training, helping to uplift the Malay/Muslim community’s educational performance and develop its resilience and adaptability.
Singapore Indian Development Association (SINDA) https://www.sinda.org.sg/ SINDA aims to raise the academic performance of Indian students and youth through tutorials, enrichment and motivation. In addition, it also offers a wide range of services to support parents and help families in need.
Chinese Development Assistance Council (CDAC) https://www.cdac.org.sg/aboutus/organisation-profile/ CDAC is a non-profit self-help group for the Chinese community. It offers programmes and assistance schemes to help the less privileged in the community to maximise their potential and strive for social mobility through self-help and mutual support.
Children’s Wishing Well: https://www.wishingwell.org.sg/ This organization is focused on the holistic education of children and youth from disadvantaged backgrounds and offers a broad range of services to them free-of-charge.
Friends of the Disabled Society (FDS) https://www.fds.org.sg/ This organization is dedicated to meet the social, emotional and physical needs of the disabled by providing avenues for them to interact among themselves and with able-bodied persons. They also encourage independence among the disabled by providing job opportunities to them.
The Theatre Practice https://www.practice.org.sg/page/donate This organization strives to be an arts space in Singapore that consciously nurtures and empowers people who care about humanity. It has developed and presented works that aim to reflect the richness and complexities of Singapore’s diverse cultures.
***********************************
* 3. Voucher Experiment *
***********************************
[At this point we note that we preferred to do this as a real experiment, but cold find no company doing online surveys in Singapore that would have the logistics to implement so].
Our last experiment aims to assess whether all supermarkets are equally valued by residents in Singapore. This third intervention is relevant to explain the return rates of misdelivered vouchers in the field experiment carried out in AEARCTR-0007559, as it allows us to tease out whether recipients’ return rates of misdelivered vouchers (i.e., our measure of pro-social behavior) are potentially driven by the different value recipients place on different supermarkets. One possible confounding factor is that, instead of driven by altruism, recipients of our misdelivered vouchers may be returning Sheng Siong vouchers because they expect others to value Sheng Siong vouchers much more than they do. That is, participants with high SES may have a much lower preference for Sheng Siong vouchers than low SES participants.
This third experiment will allow us to examine whether this is the case. Participants will be asked to think about a hypothetical scenario in which, after volunteering for a day, they receive a token of appreciation in the form of a supermarket voucher for one of the three most popular chains (randomize: Cold Storage, NTUC, or Sheng Siong). Then they'll be asked whether they would prefer to keep it, or whether they would prefer to donate it to another volunteer. This is a hypothetical experiment as we could find no company that had the capability to deliver vouchers to participants in online surveys.
The exact question participants will see is as reproduced below:
"Suppose that after volunteering one morning for the NGO you chose above, as a token of appreciation they selected at random some volunteers and gave them a $10 supermarket voucher [Randomize: Sheng Siong / NTUC / Cold Storage]. If you were selected at random, would you prefer to keep the voucher, or would you rather pass it on to another volunteer?
□ I would prefer to keep it
□ I would prefer to donate it to another volunteer"
We opted for this instead of letting participants choose among three supermarket vouchers for the following three reasons: (1) Participants could be more likely to choose the supermarket that is closest to them; (2) Even if all participants were to choose a particular supermarket, this would not mean they disregard the other two options; and perhaps most importantly (3) the experiment we have chosen most closely resembles our previous field experiment, with three different alternatives instead of only one.
Given our total sample of 1,300 participants, 433 participants will see one supermarket, 433 another one, and 434 a third one (see related power analysis below). The null hypothesis to test is whether keeping rates (i.e., the rates with which respondents choose to keep the vouchers for themselves) are the same, the alternative being that keeping rate for one supermarket is significantly higher than for the other ones.