x

Please fill out this short user survey of only 3 questions in order to help us improve the site. We appreciate your feedback!
Disseminating market information via mobile phones to cashew producers: an impact evaluation in Guinea-Bissau
Last registered on October 02, 2020

Pre-Trial

Trial Information
General Information
Title
Disseminating market information via mobile phones to cashew producers: an impact evaluation in Guinea-Bissau
RCT ID
AEARCTR-0004740
Initial registration date
September 20, 2019
Last updated
October 02, 2020 9:28 PM EDT
Location(s)

This section is unavailable to the public. Use the button below to request access to this information.

Request Information
Primary Investigator
Affiliation
Bissau Economics Lab
Other Primary Investigator(s)
PI Affiliation
Ministry of Economy and Finance, Guinea-Bissau
PI Affiliation
Ministry of Economy and Finance, Guinea-Bissau
PI Affiliation
Ministry of Economy and Finance, Guinea-Bissau
PI Affiliation
University of Oxford
Additional Trial Information
Status
On going
Start date
2019-11-03
End date
2021-04-30
Secondary IDs
Abstract
With raw cashew nuts exports accounting for 25% of the GDP and over 90% of Guinea-Bissau’s exports, cashew nuts production represents over 40% of annual income for over half of the country’s population. Recent studies have shown that the farm gate price, at which producers sell their raw cashew nuts, is a critical variable with a huge impact on the country’s GDP growth. Disperse ownership of small and medium cashew plantations across the population makes the impact of farm gate prices on poverty levels even larger. The increased variability of international raw cashew nuts prices in recent years has introduced an important source of inefficiency in this market: accurate information about short-term fluctuations in prices rarely reaches producers. This implies that producers frequently end up selling their cashew nuts at a much lower price than they could, were they to be well informed. We propose a clustered intervention to test the effect of a market information system sending weekly market and prices updates via mobile phones. An improved understanding of market dynamics, combined with better information, should improve farmers’ awareness of feasible prices, improving their capacity to negotiate better deals for their production. Our experimental design will allow us to study the relevance of spillover effects.
External Link(s)
Registration Citation
Citation
Mendonça, Adewusi et al. 2020. "Disseminating market information via mobile phones to cashew producers: an impact evaluation in Guinea-Bissau." AEA RCT Registry. October 02. https://doi.org/10.1257/rct.4740-2.0.
Sponsors & Partners

There are documents in this trial unavailable to the public. Use the button below to request access to this information.

Request Information
Experimental Details
Interventions
Intervention(s)
Our intervention seeks to provide timely and accurate market information to cashew producers during their marketing season (usually between March-July). On the day of the baseline survey, after the within-village randomization into treatments, an enumerator will explain the producer the characteristics and timing of the treatment he or she has been assigned to. During the cashew campaign, March to August, the selected producer will receive price information and market advice on their phones.
Intervention Start Date
2020-03-01
Intervention End Date
2020-08-31
Primary Outcomes
Primary Outcomes (end points)
Increased farm gate prices. See pre-analysis plan for details.
Primary Outcomes (explanation)
Primary outcome: Increased farmgate prices. Selling cashew nut production at a higher price should directly imply higher household revenue in this context, as we expect a null or very small effect of improved market information and higher prices on quantities sold (to be explored in the analysis). A key feature of our intervention is that will provide information on the more appropriate time to sell (which should allow for some temporal arbitrage). With high poverty incidence and revenues from cashew amounting to approximately 40% of total household income for cashew producers (WB 2017), we expect a significant impact of this increased revenue on important economic outcomes associated to improved household welfare.
Secondary Outcomes
Secondary Outcomes (end points)
See pre-analysis plan for details.
Secondary Outcomes (explanation)
See pre-analysis plan for details.
Experimental Design
Experimental Design
See pre-analysis plan for details.
Experimental Design Details
Not available
Randomization Method
See pre-analysis plan for details.
Randomization Unit
Clusters: villages.

Units: households.
Was the treatment clustered?
Yes
Experiment Characteristics
Sample size: planned number of clusters
282 villages.
Sample size: planned number of observations
1880 producers.
Sample size (or number of clusters) by treatment arms
- 103 villages with 694 control producers.
- 187 treated villages with 734 treated producers and 560 producers households.

Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
The main detectable effect size for the main outcome: the difference in the average selling price, with an estimated average of 500 FCFA/kg and standard deviation 100 FCFA/kg, is 30 FCFA. In percentage, compared to the average, this is a 6% of the expected average price, and 30% of its expected standard deviation.
Supporting Documents and Materials

There are documents in this trial unavailable to the public. Use the button below to request access to this information.

Request Information
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
University of Oxford
IRB Approval Date
2019-11-01
IRB Approval Number
ECONCIA19-20-20
IRB Name
Partnership for Economic Policy (PEP)
IRB Approval Date
2019-09-20
IRB Approval Number
N/A
Analysis Plan

There are documents in this trial unavailable to the public. Use the button below to request access to this information.

Request Information