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The Functioning of Self-Governing Sharing Economies.
Last registered on July 02, 2019

Pre-Trial

Trial Information
General Information
Title
The Functioning of Self-Governing Sharing Economies.
RCT ID
AEARCTR-0004088
Initial registration date
June 21, 2019
Last updated
July 02, 2019 3:04 PM EDT
Location(s)

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Primary Investigator
Affiliation
University of Groningen
Other Primary Investigator(s)
PI Affiliation
University of Groningen
Additional Trial Information
Status
On going
Start date
2019-05-06
End date
2020-02-01
Secondary IDs
Abstract
New forms of market mechanisms in which participants share products are becoming increasingly popular. In this project, we address the question whether not-for-profit initiatives in sharing economies, where at most informal rules are at play, can sustain in the long-run and to what extent free-riding occurs. The experimental intervention, which we preregister, is part of a larger study in which we collect field data. For the experimental part, a sample of local markets is randomized into a treatment and control group. After baseline field data have been collected, members of the treatment group receive a positive supply shock and we test whether this shock has a transitory or more permanent effect.
External Link(s)
Registration Citation
Citation
Schippers, Anouk and Adriaan Soetevent. 2019. "The Functioning of Self-Governing Sharing Economies.." AEA RCT Registry. July 02. https://doi.org/10.1257/rct.4088-1.0.
Former Citation
Schippers, Anouk and Adriaan Soetevent. 2019. "The Functioning of Self-Governing Sharing Economies.." AEA RCT Registry. July 02. https://www.socialscienceregistry.org/trials/4088/history/49145.
Experimental Details
Interventions
Intervention(s)
This study collects field data on an unregulated sharing economy to observe the extent to which these markets function without regulation. In the field experimental part, which we preregister, a sample of local markets is randomized into a treatment and control group. After baseline data have been collected, members of the treatment group receive a positive supply shock and we test whether this shock has a transitory or more permanent effect.
Intervention Start Date
2019-06-10
Intervention End Date
2019-09-15
Primary Outcomes
Primary Outcomes (end points)
The primary outcome variable of our field experimental intervention is the turnover rate of our experimental units compared to the control units.





Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
The secondary outcome variable of our field experimental intervention is the multiplier effect that our experimental units have on new non-experimental units in the treatment group compared to new control units.
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
For the field experimental part of this study, we randomize a number of local markets into a treatment and control group. After baseline data have been collected, members of the treatment group immediately receive a positive supply shock while members of the control group receive this shock later in the study (a few weeks before the end).
Experimental Design Details
Not available
Randomization Method
30 local markets were allocated to the treatment group and 28 to the control. Randomization was stratified based on four-digit postal codes of the local market and the number of observations per local market as reported in the first week of the study. Randomization was done in the office by a computer using Stata-code.
Randomization Unit
Local market.
Was the treatment clustered?
No
Experiment Characteristics
Sample size: planned number of clusters
58 local markets.
Sample size: planned number of observations
58 local markets, per local market a time series of 24 observations will be collected.
Sample size (or number of clusters) by treatment arms
28 local markets in the control group, 30 local markets in the treatment group
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
Supporting Documents and Materials

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IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
Institutional Review Board of the Faculty of Economics and Business, University of Groningen
IRB Approval Date
2019-06-08
IRB Approval Number
20190322-7870