The American Economic Association's registry for randomized controlled trials
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Last registered on December 18, 2018
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Initial registration date
July 03, 2018
December 18, 2018 4:35 PM EST
University of Muenster
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Other Primary Investigator(s)
University of Münster
University of Münster
Additional Trial Information
Environment & Energy
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.
Götte, Lorenz, Andreas Löschel and Matthias Rodemeier. 2018. "Follow-up Study ." AEA RCT Registry. December 18.
Götte, Lorenz et al. 2018. "Follow-up Study ." AEA RCT Registry. December 18.
Sponsors & Partners
Intervention Start Date
Intervention End Date
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 (end points)
Secondary Outcomes (explanation)
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
The randomization unit is the HTTP-Cookie of the visitor.
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
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
Supporting Documents and Materials
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Approval Date
IRB Approval Number