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Information and prices

Last registered on August 11, 2025
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Pre-Trial

Trial Information

General Information

Title
Information and prices
RCT ID
AEARCTR-0014767
Initial registration date
December 03, 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
December 13, 2024, 12:26 PM EST

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

Last updated
August 11, 2025, 6:26 AM EDT

Last updated is the most recent time when changes to the trial's registration were published.

Locations

Country
United States of America
Region

Primary Investigator

Name
Roberto Rozzi
Affiliation
Royal Holloway University of London
Contact Primary Investigator

Other Primary Investigator(s)

PI Name
Itzhak Rasooly
PI Affiliation
Sciences Po, PSE
Contact Investigator

Additional Trial Information

Status
Completed
Start date
2024-12-03
End date
2025-04-30
Keywords
Behavior
Additional Keywords
JEL code(s)
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
Abstract
See attached PDF
External Link(s)

Registration Citation

Citation
Rasooly, Itzhak and Roberto Rozzi. 2025. "Information and prices." AEA RCT Registry. August 11. https://doi.org/10.1257/rct.14767-2.0
Sponsors & Partners
Experimental Details

Interventions

Intervention(s)
Intervention (Hidden)
For each market, we will first randomly determine (with equal probabilities) whether we will bet on `Yes' or bet on `No'. When making a yes bet, we will buy however many yes shares are necessary to increase the price by 4 percentage points. When making a no bet, we will buy however many no shares are necessary to decrease the price by 4 percentage points. Note that, although the instantaneous effect of the intervention is obvious, our main interest is in estimating the persistence of the effect on prices.

For more details see the attached PDF.
Intervention Start Date
2024-12-03
Intervention End Date
2025-01-01

Primary Outcomes

Primary Outcomes (end points)
The price in a market (see the attached PDF for details)
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
See the attached PDF
Experimental Design Details
Randomization Method
Randomization done in office by a computer
Randomization Unit
Markets
Was the treatment clustered?
No

Experiment Characteristics

Sample size: planned number of clusters
110 markets
Sample size: planned number of observations
110 markets
Sample size (or number of clusters) by treatment arms
55 markets in yes group
55 markets in no group

See the attached PDF for details
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
80% power (see the attached PDF for details)
Supporting Documents and Materials
IRB

Institutional Review Boards (IRBs)

IRB Name
Paris School of Economics
IRB Approval Date
2024-10-07
IRB Approval Number
2023-042
Analysis Plan

Analysis Plan Documents

Analysis plan

MD5: 5e98a4dba2d7fe231ba8f2643ea2c45e

SHA1: 92039ba1bd8b7fc731bb5a37f5d80019e17681e3

Uploaded At: December 03, 2024

Post-Trial

Post Trial Information

Study Withdrawal

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Intervention

Is the intervention completed?
Yes
Intervention Completion Date
February 06, 2025, 12:00 +00:00
Data Collection Complete
Yes
Data Collection Completion Date
February 14, 2025, 12:00 +00:00
Final Sample Size: Number of Clusters (Unit of Randomization)
2 control and treatment group
Was attrition correlated with treatment status?
No
Final Sample Size: Total Number of Observations
110
Final Sample Size (or Number of Clusters) by Treatment Arms
Data Publication

Data Publication

Is public data available?
No

Program Files

Program Files
Reports, Papers & Other Materials

Relevant Paper(s)

Reports & Other Materials