Fairness in Winner-Take-All Markets: A Representative Study

Last registered on July 23, 2018

Pre-Trial

Trial Information

General Information

Title
Fairness in Winner-Take-All Markets: A Representative Study
RCT ID
AEARCTR-0003155
Initial registration date
July 21, 2018

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
July 23, 2018, 1:26 AM EDT

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

Locations

Region

Primary Investigator

Affiliation

Other Primary Investigator(s)

PI Affiliation
NHH Norwegian School of Economics
PI Affiliation
NHH Norwegian School of Economics
PI Affiliation
University of Zurich
PI Affiliation
NHH Norwegian School of Economics

Additional Trial Information

Status
On going
Start date
2018-07-04
End date
2018-12-31
Secondary IDs
Abstract
This trial is a replication study, based on a representative US sample, of an earlier study published in a working paper that was based on a student sample (see SSRN-link). For details of the experimental design we refer the reader to the working paper, here we only report the main differences. The purpose of the replication study is to generate results based on a more policy relevant sample of subjects --- a nationally representative sample (in terms of gender, age and region). The results from the new data collection will be added to the paper and presented in the same set of figures and tables. We have no particular prior in terms of whether the treatment effects will be larger or smaller relative to the results from the student sample in the working paper, also because the student population and the representative population are recruited from different societies (Norway and the US). We therefore view the present study more broadly as providing evidence of the generality of the initial findings reported in the working paper. In addition we will use the larger representative data set to explore heterogenous treatment effects with respect to political orientation and views on income inequality.
External Link(s)

Registration Citation

Citation
Bartling, Björn et al. 2018. "Fairness in Winner-Take-All Markets: A Representative Study." AEA RCT Registry. July 23. https://doi.org/10.1257/rct.3155-1.0
Former Citation
Bartling, Björn et al. 2018. "Fairness in Winner-Take-All Markets: A Representative Study." AEA RCT Registry. July 23. https://www.socialscienceregistry.org/trials/3155/history/32052
Experimental Details

Interventions

Intervention(s)
The treatments in this study are the same four treatments described in the working paper (WTA, WTA - No Choice, WTA - No Expectations, and Base).
Intervention Start Date
2018-07-04
Intervention End Date
2018-08-03

Primary Outcomes

Primary Outcomes (end points)
Same two outcome as in the working paper: 1) Share given to the winner, 2) Dummy variable equal to one if all earnings given to winner.
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
The experimental design closely follows the design reported in the working paper. The three main differences are: i) the spectators in the new study are recruited via Research Now / SSI and should be representative of the US population in terms of gender, age and four broad regions of the country while the initial study recruited a student sample from Norway, ii) we aim to recruit 4,000 spectators in the new study, while we had 349 spectators in the initial study, and (iii) we aim to have a one-to-five matching of spectators in the new study (every fifth spectator decision will be randomly selected and implemented), while we had one-to-one matching in the initial study (every spectator decision was implemented).
Experimental Design Details
Randomization Method
Done via computer program
Randomization Unit
Individuals
Was the treatment clustered?
No

Experiment Characteristics

Sample size: planned number of clusters
0
Sample size: planned number of observations
4,000 individuals
Sample size (or number of clusters) by treatment arms
1,000 individuals per treatment
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
For result 1, result 2, and result 3 in Section 3 of the working paper, we have power at 87% or above (at the previously estimated parameter values). For details on the power calculations we refer the reader to the github site for the paper: https://github.com/FAIR-NHH/mmwinner.
IRB

Institutional Review Boards (IRBs)

IRB Name
NHH Norwegian School of Economics Institutional Review Board (NHH IRB)
IRB Approval Date
2018-06-29
IRB Approval Number
N/A

Post-Trial

Post Trial Information

Study Withdrawal

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Intervention

Is the intervention completed?
No
Data Collection Complete
Data Publication

Data Publication

Is public data available?
No

Program Files

Program Files
Reports, Papers & Other Materials

Relevant Paper(s)

Reports & Other Materials