When Climate Policy Lacks a Party: economic vulnerability and policy support in developing countries

Last registered on September 21, 2026

Pre-Trial

Trial Information

General Information

Title
When Climate Policy Lacks a Party: economic vulnerability and policy support in developing countries
RCT ID
AEARCTR-0019660
Initial registration date
September 13, 2026

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
September 21, 2026, 9:12 AM EDT

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

Locations

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Primary Investigator

Affiliation
Central European University

Other Primary Investigator(s)

PI Affiliation
Central European University

Additional Trial Information

Status
In development
Start date
2026-09-20
End date
2026-10-31
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
Abstract
Existing research has largely explained variation in climate policy attitudes through environmental preferences, political ideology, and partisan identification. While these measures are widely used, their interpretation may depend on the socio-economic and institutional contexts in which respondents are embedded. Less attention has been paid to how citizens interpret climate policy in political contexts where climate issues remain weakly politicized and partisan signals are ambiguous. In many developing countries, climate policy is not represented by a distinct political party or stable partisan coalition comparable to those found in many Western democracies. As a result, climate policy may be less deeply embedded in established political identities, and citizens may have fewer partisan cues through which to interpret its costs and benefits.
We argue that, in such contexts, the structure of economic insecurity becomes particularly important for shaping how citizens respond to political signals and evaluate climate policy. Where employment and income are insecure, the anticipated material consequences of climate regulation may provide a more immediate basis for evaluating policy than partisan endorsements. Individuals who face greater economic insecurity are therefore expected to perceive higher personal costs from regulatory change. Consequently, when climate policy is presented, political cues are expected to exert weaker effects among economically vulnerable respondents, who are likely to perceive the policy through the lens of their immediate material consequences. By contrast, economically secure individuals experience lower perceived adjustment costs and are therefore more likely to rely on political and ideological cues when evaluating the same policy proposal. The influence of political cues should therefore depend not only on the content of the cue but also on the economic position of the individuals receiving it. We further argue that an explicit partisan endorsement can change how citizens process otherwise identical policy information, but that the extent to which such a cue matters depends on the economic risks associated with policy change.
We test these arguments using a randomized survey experiment conducted among private-sector employees in Türkiye, where climate policy has historically occupied a relatively limited place in partisan competition despite increasing policy salience. Respondents are randomly assigned to one of two versions of an identical climate policy proposal that differs only in whether the policy is explicitly associated with the incumbent government. The policy content, objectives, and expected consequences remain constant across conditions, allowing us to isolate the causal effect of political cueing. We estimate both the average treatment effect of the political cue and heterogeneous treatment effects across individuals with different levels of economic vulnerability. Our findings show that an explicit political cue increases average policy support, but that this effect is systematically conditioned by respondents’ economic circumstances. Economically vulnerable respondents are less responsive to the political cue and show greater sensitivity to the underlying material costs of regulation.
We contribute to the political economy of climate policy by showing how the relationship between political cues and climate policy support depends on the broader political and economic context. In settings where climate policy lacks strong partisan representation, labor market insecurity can become an important basis through which citizens evaluate the potential consequences of climate regulation. Methodologically, the paper advances an experimental framework for disentangling expressed policy support from context-dependent interpretation in survey responses, demonstrating that part of observed variation in climate policy attitudes reflects differences in interpretive processes rather than substantive differences in environmental preferences, and highlighting the importance of accounting for structural economic circumstances when evaluating the comparability of survey-based measures across populations.
External Link(s)

Registration Citation

Citation
Alca, Gülsün and Anıl Duman. 2026. "When Climate Policy Lacks a Party: economic vulnerability and policy support in developing countries." AEA RCT Registry. September 21. https://doi.org/10.1257/rct.19660-1.0
Experimental Details

Interventions

Intervention(s)
The study employs a between-subjects randomized survey experiment to identify the causal effect of an incumbent political cue on support for a proposed climate policy. Respondents are randomly assigned to one of two experimental conditions that differ only in whether the proposed climate policy is explicitly attributed to the incumbent government. All other aspects of the vignette—including the policy description, objectives, and expected consequences—remain identical across conditions.
Intervention Start Date
2026-09-25
Intervention End Date
2026-10-14

Primary Outcomes

Primary Outcomes (end points)
Primary Dependent Variable: Policy Support,
Primary Outcomes (explanation)
Primary Dependent Variable (Policy Support ): Measured using question Q12 on a 1 to 5 scale (1 = Strongly Oppose to 5 = Strongly Support). Q12: To what extent do you support the proposed regulation?

The primary outcome is respondents' expressed support for the proposed climate policy immediately following exposure to the experimental vignette.

Secondary Outcomes

Secondary Outcomes (end points)
Primary Mechanism Variable: Interpretive Frame: Measured using Question Q13, administered immediately after the policy support question to capture respondents' primary interpretive frame.
Secondary Outcomes (explanation)
Q13: When evaluating the regulation you just read, which of the following was the most important consideration for you? Response categories: (1) Political values/party alignment, (2) Own job/household finances, (3) Türkiye's economy and major industries, (4) Environmental and climate impacts, (5) Employment impacts, (6) Don't know/No opinion.

Experimental Design

Experimental Design
The study employs a between-subjects randomized survey experiment to identify the causal effect of an incumbent political cue on support for a proposed climate policy. In both conditions, respondents will read an identical vignette describing a proposed climate-related environmental regulation affecting large industrial firms. The treatment condition explicitly attributes the proposed policy to the AK Party government, whereas the control condition presents the same policy without a partisan attribution. All other elements of the vignette are held constant across conditions.

Randomization occurs at the individual respondent level using simple random assignment with equal allocation to treatment and control (1:1). Following exposure to the vignette, respondents will report their level of support for the proposed policy and answer additional questions measuring their interpretation of the policy and perceived consequences. The study is designed to estimate the causal effect of an incumbent political cue on climate policy support and to examine whether this effect varies according to respondents' pre-treatment economic vulnerability.
Experimental Design Details
Not available
Randomization Method
Randomization performed automatically by a computer through the survey platform Qualtrics using simple random assignment with equal probability across the two experimental conditions (1:1 allocation).
Randomization Unit
Individual respondent.

Each respondent is independently randomized to either the treatment or control condition. There is only one level of randomization.
Was the treatment clustered?
No

Experiment Characteristics

Sample size: planned number of clusters
0
Sample size: planned number of observations
2,000
Sample size (or number of clusters) by treatment arms
2,000 individual respondents, with approximately 1,000 respondents assigned to each experimental condition under equal-probability random assignment.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
For the main effect of the political cue on policy support, measured on a 1–5 scale, the planned sample size of 2,000 respondents provides 80% power to detect a standardized mean difference of approximately Cohen's d = 0.126. The calculation assumes a two-tailed significance level of α = 0.05 and equal allocation across treatment and control conditions (approximately 1,000 respondents per condition). Assuming a standard deviation of approximately 1.0 on the 5-point policy-support outcome scale, this corresponds to a minimum detectable difference of approximately 0.126 scale points. The primary outcome models will additionally adjust for pre-treatment baseline environmental attitudes, age, gender, education, and self-reported ideology. These covariates are included to improve estimation precision.
Supporting Documents and Materials

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IRB

Institutional Review Boards (IRBs)

IRB Name
Central European University Ethical Research Committee
IRB Approval Date
2026-08-02
IRB Approval Number
2025-2026/15/EX
Analysis Plan

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