Follow-up Study
Last registered on February 28, 2019

Pre-Trial

Trial Information
General Information
Title
Follow-up Study
RCT ID
AEARCTR-0003122
Initial registration date
July 03, 2018
Last updated
February 28, 2019 10:04 PM EST
Location(s)

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Primary Investigator
Affiliation
University of Münster
Other Primary Investigator(s)
PI Affiliation
University of Münster
PI Affiliation
University of Münster
Additional Trial Information
Status
In development
Start date
2018-07-04
End date
2019-06-30
Secondary IDs
Abstract
We run a follow-up study for the registered field experiment "The Welfare Effects of Information Nudges - Evidence from a Natural Field Experiment" (RCT ID: AEARCTR-0002814). In a brief 3-question survey we test how our different informational treatments have affected consumer beliefs and whether the change in beliefs is associated with a change in purchasing behavior.
External Link(s)
Registration Citation
Citation
Götte, Lorenz, Andreas Löschel and Matthias Rodemeier. 2019. "Follow-up Study ." AEA RCT Registry. February 28. https://www.socialscienceregistry.org/trials/3122/history/42273
Experimental Details
Interventions
Intervention(s)
Intervention Start Date
2018-07-04
Intervention End Date
2018-07-18
Primary Outcomes
Primary Outcomes (end points)
Subject's belief about how much a 4W LED light bulb saves in annual electricity costs compared to a 40W incandescent light bulb.
Self-reported electricity price of the subject.
Self-reported number of hours a subject uses a light bulb on average.
The number of LED, CFL, halogen and incandescent light bulbs purchased.
The average energy efficiency level (wattage) of the products purchased.
The price elasticity for all four light bulb technologies (incandescent, halogen, CFL, LED).
The probability of purchasing.
The probability of purchasing a light bulb.
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
Visitors of an online shop are randomly assigned to one of three groups in a between-subject design. A banner on the website invites subjects to participate in a short survey. Within the survey, subjects receive one of three information screens about the electricity savings of LED light bulbs. The survey then elicits subjects' savings beliefs. After completion of the survey, every participant receives a voucher for light bulbs.

Experimental Design Details
Not available
Randomization Method
By computer.
Randomization Unit
The randomization unit is the HTTP-Cookie of the visitor.
Was the treatment clustered?
No
Experiment Characteristics
Sample size: planned number of clusters
1000
Sample size: planned number of observations
1000
Sample size (or number of clusters) by treatment arms
333
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
IRB Approval Date
IRB Approval Number