Experimental Design Details
This experiment will be conducted in 80 villages of Salima district in Malawi, with 2,400 participants. As this experiment will be conducted alongside another project’s baseline survey, this sample size was based on the power calculations for our other project. Within each village, our sample is built using a random walk approach: the enumerators assess the eligibility of every 5th or 4th house they encounter in the village while following a pre-determined path. The households are considered eligible to participate in the experiment if:
1) There is at least one child aged 3-12 in the household, 2) Both parents live in the household, 3) Nobody is allergic to peanuts in the household.
The second criteria was added to guarantee that households in which we interrogate fathers are not on average different from households in which we interrogate mothers. Only mothers are invited to take part in the experiment in 64 villages. In the remaining 16 villages, we randomly select whether the mother or the father, within the eligible household, will be invited to participate in the experiment. In those villages, we over-sample fathers to ensure that we will have a large enough number of fathers in our experiment. We aim to have 360 fathers in our sample. If the household has more than one child aged 3-12, we will randomly select which child will be invited to take part in the experiment.
The subjects are randomized across treatment arms in two steps:
• They are first allocated to be offered different commitment devices: a “Probabilistic commitment” or “Child’s participation (chosen)”.
•Subjects allocated to being offered a probabilistic commitment device are then allocated to different framings of choice at t = 2: "Baseline", "Labeling", "Random", "Child's participation (imposed)".
A. Commitment devices
Probabilistic commitment devices
We offer the respondents in those treatment arms a probabilistic commitment device (following Augenblick, Niederle and Sprenger (2015)), which decreases the likelihood that the t = 2 allocation is chosen over the t = 1 allocation. In other treatment arms or if the respondents do not wish to take up a commitment device, the t = 1 decision will be executed with a 10% probablity. If the respondents take up a commitment device, the probability that the t = 1 decision will be executed increases to 90%. This allows us to observe both t = 1 and t = 2 decisions for all
respondents, irrespective of commitment and guarantees the credibility of both decisions because the respondents are aware in each round that their decision can be selected to be executed. The respondents are offered to take up a probabilistic commitment device after making a decision for each scenario during the first visit. We randomly vary the price of the commitment device: to purchase the commitment device, the respondent will have to forego 0.5/1/1.5 packets of peanuts at t = 3.
Child’s participation (chosen)
We ask respondents in this subsample whether they would like to invite their child to make the t = 2 decision for part Red with them. This could be a way for t = 1 parents to force their t = 2 self to stick to the plan they had made for their child. We randomly vary the price of this commitment device: to purchase the commitment device, the respondent will have to forego 0/0.5/1/1.5 packets of peanuts at t = 3.
B. Framing of choices
Baseline
The enumerators speak to the respondents alone during the second visit. The respondents are invited to taste a small quantity of peanuts at the beginning of the interview, explained the rules of the experiment one more time and asked how they would like to act in each scenario.
Labeling treatment
The enumerators speak to the respondents alone during the second visit. The respondents are invited to taste a small quantity of peanuts at the beginning of the interview, explained the rules of the experiment one more time, presented with the allocation choice they have made in scenario Red at t = 1 and asked how they would like to act in each scenario.
Random Anchoring treatment
The enumerators speak to the respondents alone during the second visit. The respondents are invited to taste a small quantity of peanuts at the beginning of the interview, explained the rules of the experiment one more time, presented with a random allocation in scenario Red and asked how they would like to act in each scenario. This treatment arm enables us to distinguish between the effect of labeling itself and of anchoring.
Child’s participation (imposed)
During the second visit, the children are asked to participate in part Red decision in this treatment arm. The respondents and the children are invited to taste a small quantity of peanuts at the beginning of the interview, explained the rule of the experiment. The respondent makes a decision on part Blue alone and on part Red jointly with the child. This treatment arm enables us to measure the impact of an increase in the child’s bargaining power on parent-bias, without the self-selection inherent to parents having chosen to involve their child as a commitment device.
C. Survey instruments
Naive and sophisticates
Understanding how sophisticated individuals are with regards to their future behavior is key to interpreting the demand for commitment devices. However, incentivizing questions eliciting beliefs about one’s own future behavior can lead to changes in this future behavior (Acland and Levy, 2015) or can encourage individuals to use predictions about their own behavior as a commitment device (Augenblick and Rabin, Forthcoming). To circumvent this problem, we adopt a strategy following closely that of Toussaert (2018). After making a choice for each scenario, respondents are asked an incentivized question eliciting their beliefs about others’ behavior:
• Scenario Blue: We are asking many other households to make those decisions. Do you think that two days from now most other people will...
– Choose to receive MORE peanuts immediately than they did today?
– Choose to receive LESS peanuts immediately than they did today?
– Choose to receive the same amount of peanuts immediately as they did today?
• Scenario Red: We are asking many other households to make those decisions. Do you think that two days from now most other people will..
– Choose to give LESS peanuts to the child than they did today?
– Choose to give MORE peanuts to the child than they did today?
– Choose to give the same amount of peanuts to the child as they did today?
Correctly predicting the behavior of the majority of the population will earn the respondents one additional packet of peanuts at the end of round three. Those questions are motivated by research that shows that people use information about their own behavior to inform their beliefs about the behavior of others.