Testing incentives to encourage asbestos removal

Last registered on February 03, 2025

Pre-Trial

Trial Information

General Information

Title
Testing incentives to encourage asbestos removal
RCT ID
AEARCTR-0014411
Initial registration date
September 23, 2024

Initial registration date is when the trial was registered.

It corresponds to when the registration was submitted to the Registry to be reviewed for publication.

First published
October 07, 2024, 6:48 PM EDT

First published corresponds to when the trial was first made public on the Registry after being reviewed.

Last updated
February 03, 2025, 6:08 PM EST

Last updated is the most recent time when changes to the trial's registration were published.

Locations

Region

Primary Investigator

Affiliation
Behavioural Economics Team of the Australian Government

Other Primary Investigator(s)

Additional Trial Information

Status
Completed
Start date
2024-09-05
End date
2025-01-24
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
Abstract
As part of the Phase 3: Asbestos National Strategic Plan 2024-2030 (ANSP), the Asbestos and Silica Safety and Eradication Agency (ASSEA) aims to encourage the safe removal of asbestos from Australian residences. ​

For residential buildings, the cost of asbestos removal, disposal and replacement is the main impediment to removal (Ipsos 2018). Hypothetical government initiatives that reduced this cost for homeowners (e.g. subsidised removal or disposal, low or no interest loans, and tax concessions) have been associated with higher reported willingness to remove asbestos (Ipsos 2018).​

Trial aims
Estimate the impact that information about the increasing risk of asbestos (due to its increasing age) can have on the amount participants are willing to pay to remove asbestos (Randomised Controlled Trial).
External Link(s)

Registration Citation

Citation
Team Registration, BETA. 2025. "Testing incentives to encourage asbestos removal." AEA RCT Registry. February 03. https://doi.org/10.1257/rct.14411-2.0
Sponsors & Partners

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Experimental Details

Interventions

Intervention(s)
The intervention is a short paragraph describing the increasing risk of asbestos in Australian homes. The treatment/intervention group receive this information before being asked to complete the outcome measure. The control group receive the same information only at the end of the study (after completing the outcome measure).
Intervention (Hidden)
Intervention Start Date
2024-09-05
Intervention End Date
2024-09-26

Primary Outcomes

Primary Outcomes (end points)
the primary outcome measure is the price (in $) participants say they could afford to pay if they had to remove asbestos. At the individual level this is asked as a single question, and participants enter a dollar value in response. At a group level this will be the mean dollar value in each group.
Primary Outcomes (explanation)
If a participant skips this question, their response will be coded as ‘missing’.
If they enter $0, this will count as a legitimate response.

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
In the RCT, participants are randomised into two groups to assess how timing of receiving risk information affects their responses regarding how much money they can afford for asbestos. Group A receives risk information about asbestos hazards before they are asked how much money they could realistically afford to pay for asbestos removal, while group B receives this information afterwards.
The timing of receiving risk information is the independent variable, the outcome variable is the amount of money participants are able to pay for asbestos removal.
Experimental Design Details
Randomization Method
The RCT component of this trial is an individually randomised online experiment. Participants will be randomised to 1 of 2 arms (no additional risk information vs additional risk information). Randomisation will be done by Qualtrics (the survey software), by giving each participant a 1/2 probability of being assigned to each trial arm.
Randomization Unit
Randomisation will occur at the individual level
Was the treatment clustered?
No

Experiment Characteristics

Sample size: planned number of clusters
no clusters
Sample size: planned number of observations
Our sample is fixed at around 4,500 individuals, which will provide 2,000 individuals per group (conservatively, after exclusions).
Sample size (or number of clusters) by treatment arms
Our sample is fixed at around 4,500 individuals, which will provide 2,000 individuals per group (conservatively, after exclusions).
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
For this study, alpha is set to 0.05, and hypothesis tests will be two-sided. Our pilot study revealed a much larger SD in the outcome variable than initially assumed (SD = $28,599). With this variability incorporated, we calculated the design has 80% power to detect an effect size of $1740 (Cohen’s d = 0.061).
IRB

Institutional Review Boards (IRBs)

IRB Name
Macquarie University - BETA Low Risk Subcommittee
IRB Approval Date
2024-08-27
IRB Approval Number
520241809158945

Post-Trial

Post Trial Information

Study Withdrawal

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Intervention

Is the intervention completed?
Yes
Intervention Completion Date
September 26, 2024, 12:00 +00:00
Data Collection Complete
Yes
Data Collection Completion Date
September 26, 2024, 12:00 +00:00
Final Sample Size: Number of Clusters (Unit of Randomization)
4,105 individuals
Was attrition correlated with treatment status?
Yes
Final Sample Size: Total Number of Observations
4,105 individuals
Final Sample Size (or Number of Clusters) by Treatment Arms
2,056 individuals in the control group, 2,049 in the treatment group. (The total sample size was 4,403, but 298 individuals had missing data on either the outcome variable, the covariate (income), or both.)
Data Publication

Data Publication

Is public data available?
No

Program Files

Program Files
No
Reports, Papers & Other Materials

Relevant Paper(s)

Abstract
Asbestos in Australian homes is getting older and degrading, increasing the risk that harmful fibres are released.

In partnership with the Asbestos and Silica Safety and Eradication Agency (ASSEA), BETA surveyed over 4,400 owners of homes built before 1990, to determine which financial incentives would encourage them to proactively remove asbestos from their properties.

Of the incentives we tested in a discrete choice experiment, homeowners strongly preferred grants – but grants can have economic downsides, like cost inflation. Loans and tax offsets appeared to be marginally effective. Homeowners are likely to respond to programs that clearly communicate their concrete financial benefits.

Our survey revealed that although costs vary widely and can be prohibitive, most homeowners could afford many asbestos removal jobs. Clearly communicating the likely price, process and benefits may clarify that asbestos removal is achievable.

Many homeowners do not know if their property contains asbestos or not. Furthermore, many are not motivated to find out. Incentives that encourage discovery may lead to an increase in asbestos removal rates.

While many homeowners indicated that health concerns would increase their willingness to remove asbestos, our survey also revealed that in practice most homeowners remove asbestos only when renovating. Asbestos removal incentives could be packaged with support for other types of home upgrades (like energy efficiency or disaster preparedness).
Citation
Commonwealth of Australia, Department of the Prime Minister and Cabinet, (2025). Safety meets savings: Exploring financial incentives for asbestos removal. ISBN978-1-925365-66-5 https://behaviouraleconomics.pmc.gov.au/sites/default/files/projects/exploring-financial-incentives-asbestos-removal.pdf

Reports & Other Materials

Description
Technical report
Citation
https://behaviouraleconomics.pmc.gov.au/sites/default/files/projects/exploring-financial-incentives-asbestos-removal-technical.pdf
Description
Pre-analysis plan
Citation
https://behaviouraleconomics.pmc.gov.au/sites/default/files/projects/exploring-financial-incentives-asbestos-removal-pre-analysis.pdf