AEA RCT Registry

Trial Information

General Information

Title

Reference Dependent or Independent Labour Supply among Street Paper Sellers

RCT ID

AEARCTR-0014308

Initial registration date

September 16, 2024

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

September 17, 2024, 1:52 PM EDT

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

Locations

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Primary Investigator

Name

Niklas Jakobsson

Affiliation

Nationalekonomi

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Other Primary Investigator(s)

PI Name

Mats Ekman

PI Affiliation

Karlstad University

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PI Name

Andreas Kotsadam

PI Affiliation

Frisch Centre

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Additional Trial Information

Status

In development

Start date

2024-09-25

End date

2024-11-27

Keywords

Behavior, Labor

Additional Keywords

JEL code(s)

D01, J22

Secondary IDs

Prior work

This trial does not extend or rely on any prior RCTs.

Abstract

We investigate whether labor suppliers behave as though they have reference-dependent preferences to attempt to reach specific income targets, a consequence of prospect theory.

External Link(s)

Registration Citation

Citation

Ekman, Mats, Niklas Jakobsson and Andreas Kotsadam. 2024. "Reference Dependent or Independent Labour Supply among Street Paper Sellers." AEA RCT Registry. September 17. https://doi.org/10.1257/rct.14308-1.0

Sponsors & Partners

Interventions

Intervention(s)

In an intervention directed at sellers of a paper, we randomly reward some sellers per copy they sell.

Intervention Start Date

2024-09-25

Intervention End Date

2024-11-27

Primary Outcomes

Primary Outcomes (end points)

Total number of sold papers of the issue

Primary Outcomes (explanation)

See the pre-analysis plan for details.

Secondary Outcomes

Secondary Outcomes (end points)

Log of Total number of sold papers of the issue
Total number of sold papers of the issue via the electronic system
Total number of sold papers of the issue via cash
Hours worked selling the issue
Number of days worked selling the issue
Total number of sold papers of the issue

Secondary Outcomes (explanation)

See the pre-analysis plan for details.

Experimental Design

Random assignment

Experimental Design Details

Not available

Randomization Method

Coin flip

Randomization Unit

Individual

Was the treatment clustered?

No

Experiment Characteristics

Sample size: planned number of clusters

150 sellers.

Sample size: planned number of observations

150 sellers.

Sample size (or number of clusters) by treatment arms

75 treated in month 1, 75 control in month 1.

Minimum detectable effect size for main outcomes (accounting for sample design and clustering)

The sample will contain around 150 individuals, with half assigned to treatment and half to control. We know that the lags have very strong predictive power for the outcome, amounting to an R-square of 0.71, so we take that into consideration. At the conventional level of significance of 0.05, an R-square of 0.7, and a power of 0.8, our sample size would allow for a minimum detectable effect of 0.25 standard deviations.

Supporting Documents and Materials

IRB

Institutional Review Boards (IRBs)

IRB Name

Swedish Ethical Review Authority

IRB Approval Date

2023-10-05

IRB Approval Number

2023-05373-01

Analysis Plan