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Information Preferences and the Short and Long Run Effects of Information
Last registered on November 12, 2019

Pre-Trial

Trial Information
General Information
Title
Information Preferences and the Short and Long Run Effects of Information
RCT ID
AEARCTR-0005015
Initial registration date
November 10, 2019
Last updated
November 12, 2019 12:14 PM EST
Location(s)

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Primary Investigator
Affiliation
Universtiy of Mannheim
Other Primary Investigator(s)
PI Affiliation
University of Mannheim
Additional Trial Information
Status
On going
Start date
2019-11-11
End date
2020-05-31
Secondary IDs
Abstract
In this project, we investigate how information on industrial livestock farming affects meat consumption in the short and long run. We estimate the demand for information and analyze how the effect of information varies with information preferences.
External Link(s)
Registration Citation
Citation
Epperson, Raphael and Andreas Gerster. 2019. "Information Preferences and the Short and Long Run Effects of Information ." AEA RCT Registry. November 12. https://doi.org/10.1257/rct.5015-1.1.
Experimental Details
Interventions
Intervention(s)
Based on an encouragement design, individuals receive (or do not receive) information on industrial livestock farming.
Intervention Start Date
2019-11-11
Intervention End Date
2020-05-31
Primary Outcomes
Primary Outcomes (end points)
Short run:
Binary outcome of whether an individual chooses a voucher for a non-vegetarian (instead of a vegetarian) meal.

Long run:
Binary outcome of whether an individual eats meat when purchasing a meal in one of the canteens during the observed time period after the laboratory experiment. (The number of observations per individual depends on the number of purchases made.)

Primary Outcomes (explanation)
Long run:
We code a meal as containing meat based on the weekly food plans. In cases where our data is insufficient to determine exactly whether a meal contained meat (e.g. the salad bar), we code it as containing meat if meals in that category typically do.
Secondary Outcomes
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
Our research design builds on three central elements: (i) the elicitation of the willingness-to-pay (WTP) for information on industrial livestock farming, (ii) variation in the treatment of receiving this information, and (iii) the observation of the subjects’ meal choices (in particular their meat consumption) in the short and long run.We investigate short run effects based on a laboratory experiment. In addition, we can analyze long run effects due to supplementary field data.
Experimental Design Details
Not available
Randomization Method
Randomization is done via oTree
Randomization Unit
Individual
Was the treatment clustered?
No
Experiment Characteristics
Sample size: planned number of clusters
1,000 Individuals
Sample size: planned number of observations
1,000 Individuals
Sample size (or number of clusters) by treatment arms
Due to the encouragement design, the exact numbers are unclear. In our power calculations, we use the empirical WTP distribution from our pretest. See the attached pre-analysis plan for more details.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
See the attached pre-analysis plan.
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
Ethics Committee at the University of Mannheim
IRB Approval Date
2019-10-15
IRB Approval Number
EK Mannheim 30/2019
Analysis Plan

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