Does information stimulate demand for and supply of high-quality food

Last registered on October 17, 2022

Pre-Trial

Trial Information

General Information

Title
Does information stimulate demand for and supply of high-quality food
RCT ID
AEARCTR-0010170
Initial registration date
October 14, 2022

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
October 17, 2022, 5:32 PM EDT

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

Locations

Region

Primary Investigator

Affiliation
CIAT

Other Primary Investigator(s)

PI Affiliation
CIMMYT
PI Affiliation
CIMMYT
PI Affiliation
University of Nairobi

Additional Trial Information

Status
On going
Start date
2022-07-01
End date
2023-01-19
Secondary IDs
Prior work
This trial is based on or builds upon one or more prior RCTs.
Abstract
Food safety is mostly an unobservable trait that can only be assured through specialized tests, or through other market mechanisms like certification and brand reputation, or through government regulation. For the informal markets in developing countries, the testing costs are high relative to the value of food (but lower compared to the social burden of unsafe food), and the regulatory enforcement and reputation mechanisms are weak resulting in undersupply of food safety attributes. Evidence has shown that some food safety attributes correlate with easily observable food attributes. Provision of such information may enable consumers to ascertain not easy-to-observe safety attributes at a minimal cost resulting in an increase in the demand for these attributes incentivizing the supply of the safety attributes. This study aims to test the effect of informing both traders and consumers on the correlation between the levels of aflatoxin contamination and the integrity of the maize grain kernel on the demand and supply of aflatoxin-safe maize.
External Link(s)

Registration Citation

Citation
Cheruiyot, Edith et al. 2022. "Does information stimulate demand for and supply of high-quality food." AEA RCT Registry. October 17. https://doi.org/10.1257/rct.10170-1.0
Sponsors & Partners

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Experimental Details

Interventions

Intervention(s)
We provide information on the correlation between maize grain integrity and likelihood of aflatoxin contamination.
Negative framing of the information: Avoid maize with broken grains to reduce chances of exposure to aflatoxin
Positive framing of the information: Purchase maize with no broken grains to increase chances of the maize being safe from aflatoxin contamination.
Intervention Start Date
2022-09-19
Intervention End Date
2022-11-19

Primary Outcomes

Primary Outcomes (end points)
Maize prices for different types of maize based on quality
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
i. Quality of maize
ii. Volumes of maize traded: This will be measured as the total amount of maize in kilograms sold during the day when the trader is visited (market day) for each of the maize types per trader
iii. Consumer awareness of the correlation between the observable quality and aflatoxin contamination
iv. Consideration of proportion of broken kernels during purchase
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
The intervention in this study entails provision of information with two main messages: i) what is aflatoxin and, ii) the correlation between the quality of the outer layer of maize kernels and aflatoxin contamination. Randomization is at market level. The study targets 90 markets with maize traders in Meru County of Kenya. We randomly assign the markets into either the treatment or control group with each market having a 50% chance of being in the treatment or control group. The treatment group was further randomly subdivided into two groups, one for the positive framing of the information, and the other, the negative framing of the information.
Experimental Design Details
The intervention in this study entails provision of information with two main messages: i) what is aflatoxin and, ii) the correlation between the quality of the outer layer of maize kernels and aflatoxin contamination. Randomization is at market level. The study targets 90 markets with maize traders in Meru County of Kenya. We randomly assign the markets into either the treatment or control group with each market having a 50% chance of being in the treatment or control group. The treatment group was further randomly subdivided into two groups, one for the positive framing of the information, and the other, the negative framing of the information.
Randomization Method
Randomization done in office by a computer
Randomization Unit
Market level
Was the treatment clustered?
Yes

Experiment Characteristics

Sample size: planned number of clusters
90 markets
Sample size: planned number of observations
At least 500 traders, and 300 consumers
Sample size (or number of clusters) by treatment arms
30 markets information with positive framing, 30 markets information with neutral framing, 30 markets control
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
Effect size = 0.25 Sample per cluster = 10 on average Inter-cluster correlation = 0.1 Power = 0.7 alpha = 0.05
IRB

Institutional Review Boards (IRBs)

IRB Name
Amref Health Africa
IRB Approval Date
2022-04-08
IRB Approval Number
ESRC P1141/2022
Analysis Plan

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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