NEW UPDATE: Completed trials may now upload and register supplementary documents (e.g. null results reports, populated pre-analysis plans, or post-trial results reports) in the Post Trial section under Reports, Papers, & Other Materials.
Preferences for redistribution and perceptions of inequality in Indonesia
Initial registration date
November 06, 2017
June 30, 2020 2:19 AM EDT
This section is unavailable to the public. Use the button below
to request access to this information.
Other Primary Investigator(s)
Additional Trial Information
This project explores whether preferences for redistribution in Indonesia are reduced because people underestimate the level of inequality and overestimate the degree of social mobility. Studying these concepts interactively is consistent with a number of seminal models and provides important additional insight. This research will be conducted through an online experiment in Indonesia whereby ‘information interventions’ about inequality and mobility are provided to randomly selected treatment groups to see the impact on their preferences for redistribution. These information interventions are motivated by misperceptions of inequality and mobility that were revealed in a 2014 nationally representative survey.
Various combinations of the following three ‘information interventions’ will be provided in the online experiment:
1) Information about the Level of Inequality in Indonesia 2) Information about the Prospect for Upward Mobility in Indonesia 3) Information about a survey respondents Place in Distribution
Intervention Start Date
Intervention End Date
Primary Outcomes (end points)
There are two main outcomes of interest. These are:
1) Concern about inequality 2) Preferences for redistribution (the analysis plan in the documents section explains which questions are used to measure these outcomes)
The key research questions are as follows:
- What are the underlying preferences for redistribution in Indonesia?
- Are preferences for redistribution elastic?
- What types of information about inequality have the largest effect on preferences for redistribution?
- Will providing information about both inequality and mobility have a larger effect on preferences for redistribution than just providing information about inequality?
- Are people’s preferences for redistribution influenced more by information about their place in the distribution or information about a combination of the overall level of inequality and mobility?
Primary Outcomes (explanation)
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
The impact of the information interventions will be evaluated via an online survey. This survey will be conducted in late 2017.
This is a randomized control trial at the individual level. There will be 3 treatment groups and one control group with 875 people in each. The three treatment groups will receive one of the following interventions:
(T1) - information about the level of inequality
(T2) - information about both inequality and mobility
(T3) - information about a respondent’s place in the distribution
Experimental Design Details
The randomization process occurred through a command in the survey firm’s customized software.
Was the treatment clustered?
Sample size: planned number of clusters
Sample size: planned number of observations
Sample size (or number of clusters) by treatment arms
875 individuals in each treatment arm and the control group.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
Power calculations have been conducted to estimate the sample size required based upon the average effect size and treatment group size of similar studies on this topic (eg Karadja et al (2017)). The minimum detectable effect size is around 7.5 percentage points (with power 0.8 and alpha 0.05) as the sample size is 875 in each group. It is assumed that the effect size in this project will be larger than in other studies because the ‘information interventions’ contain more information and existing misperceptions in Indonesia are larger than what existed in the developed countries used in other studies.
INSTITUTIONAL REVIEW BOARDS (IRBs)
Australian National University Asia Pacific Delegated Ethics Review Committee
IRB Approval Date
IRB Approval Number