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With research staff from more than 60 countries, and offices across the globe, IFPRI provides research-based policy solutions to sustainably reduce poverty and end hunger and malnutrition in developing countries.

Erick Boy

researcher spotlight

Erick Boy

Erick Boy is the Chief Nutritionist in the HarvestPlus section of the Innovation Policy and Scaling Unit. As head of nutrition for the HarvestPlus Program since 2008, he has led research that has generated scientific evidence on biofortified staple crops as efficacious and effective interventions to help address iron, vitamin A, and zinc deficiency in sub-Saharan Africa, Latin America, and South Asia.

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Since 1975, IFPRI’s research has been informing policies and development programs to improve food security, nutrition, and livelihoods around the world.

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IFPRI currently has more than 600 employees working in over 80 countries with a wide range of local, national, and international partners.

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experts

Development Strategies and Governance

James Warner

Research Fellow/Program Leader, Rwanda

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Bio

James Warner is a Research Fellow in the Development Strategies and Governance Unit, and is the Program Leader for Rwanda. He first joined IFPRI in 2013 as a Research Coordinator based in Addis Ababa, Ethiopia. He has also been the office head of IFPRI’s Eastern and Southern Africa Office, which provided both analytical support and capacity building to regional partners. Before joining IFPRI, James worked extensively in eastern and southern Africa as both an academic and economic policy consultant. He lectured at four African universities and worked for a variety international development projects and institutions, including the Centre for the Study of African Economies, Orgut (a Swedish development firm), Harvard University, and UNICEF. In addition, he was a tenured Associate Professor of Economics at the College of Wooster in Wooster, Ohio. His education includes a PhD from the University of Utah, master’s degrees from the University of New Hampshire and University of California, Riverside, and an bachelor’s degree from Bates College in Lewiston, Maine.

Publications

CV

Publications

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Brief

Synopsis: Cost effective options for inclusive and sustainable development in Rwanda

2025Aragie, Emerta A.; Niyonsingiza, Josue; Thurlow, James; Warner, James; Xu, Valencia Wenqian
Details

Synopsis: Cost effective options for inclusive and sustainable development in Rwanda

The study systematically ranks investment options in the agrifood system based on their cost-effectiveness across multiple development outcomes. Investments in SME processors and traders and livestock extension are the most cost-effective for promoting agrifood GDP growth and employment. SMEs and livestock services together with seed systems and credit access contribute positively to social outcomes (poverty, undernourishment, and diet). The analysis finds a trade-off between economic gains and environmental outcomes— higher GDP effects often come with greater environmental costs. The Rwandan case demonstrates a slight shift in the relative cost-effectiveness of investments when accounting for historical climatic risks. The study emphasizes the need for data-driven investment planning, climate-aware policies, and balancing short-term gains with long-term sustainability objectives.

Year published

2025

Authors

Aragie, Emerta A.; Niyonsingiza, Josue; Thurlow, James; Warner, James; Xu, Valencia Wenqian

Citation

Aragie, Emerta; Niyonsingiza, Josue; Thurlow, James; Warner, James; and Xu, Valencia Wenqian. 2025. Synopsis: Cost effective options for inclusive and sustainable development in Rwanda. Rwanda SSP Policy Note 25. Washington, DC: International Food Policy Research Institute. https://hdl.handle.net/10568/174709

Country/Region

Rwanda

Keywords

Africa; Eastern Africa; Sub-saharan Africa; Sustainable Development; Agrifood Systems; Investment; Agricultural Extension

Language

English

Access/Licence

Open AccessCC-BY-4.0

Source

Source record

Record type

Brief

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Working Paper

Unlocking agricultural efficiency: A stochastic frontier analysis of smallholder farmers in Rwanda

2025Benimana, Gilberthe Uwera; Warner, James; Missiame, Arnold Kwesi
Details

Unlocking agricultural efficiency: A stochastic frontier analysis of smallholder farmers in Rwanda

Agriculture is central to Rwanda’s economy, supporting the livelihood of about 70% of the population and contributing significantly to GDP. Smallholder farmers face many production challenges such as limited use of modern inputs, low productivity, and vulnerability to climate change. Despite efforts like the Crop Intensification Program and the Smart Nkunganire System, which aim to en hance access to resources, agricultural productivity remains suboptimal for Rwanda smallholder farmers. This study seeks to identify specific sources of technical inefficiencies among smallholder farmers, focusing on the total value of farmer’s crop output. By using stochastic frontier analysis, a robust quantitative method for separating inefficiencies and random shocks, the study assessed the overall technical efficiency of smallholder farmers in Rwanda and identified the key factors influencing crop output value. The analysis reveals that fertilizer use, pesticide application, labor, seed use, and land size are key drivers of crop output value. This research further indicates that farmers operate at only 45% of their potential productivity, given the same level of input and technology, highlighting substantial room for efficiency improvements to reach the optimal output value frontier. Furthermore, additional analysis emphasizes the critical role of socioeconomic factors in shaping technical efficiency. The findings highlight the need for targeted interventions to optimize resource utilization, streamline labor allocation and strengthen access to extension services and government initiatives aimed at boosting agricultural production value. These strategies can substantially improve technical efficiency, enabling farmers to achieve optimal crop output values and advancing Rwanda’s agricultural development objectives.

Year published

2025

Authors

Benimana, Gilberthe Uwera; Warner, James; Missiame, Arnold Kwesi

Citation

Benimana, Gilberthe Uwera; Warner, James; and Missiame, Arnold Kwesi. 2025. Unlocking agricultural efficiency: A stochastic frontier analysis of smallholder farmers in Rwanda. Rwanda SSP Working Paper 17. Washington, DC: International Food Policy Research Institute. https://hdl.handle.net/10568/174560

Country/Region

Rwanda

Keywords

Africa; Eastern Africa; Sub-saharan Africa; Agriculture; Smallholders; Stochastic Models; Crops; Agricultural Development

Language

English

Access/Licence

Open AccessCC-BY-4.0

Source

Source record

Record type

Working Paper

Resource thumbnail

Brief

Rwanda: Cost effective options for inclusive and sustainable development

2025Aragie, Emerta A.; Niyonsingiza, Josue; Thurlow, James; Warner, James; Xu, Valencia Wenqian
Details

Rwanda: Cost effective options for inclusive and sustainable development

In this policy brief, we present research findings of a systematic evaluation and ranking of investment options for Rwanda’s agrifood system based on their cost-effectiveness in achieving multiple devel opment outcomes, including agrifood gross domestic product (GDP) growth, agrifood job creation, poverty reduction, declining rates of undernourishment, and lowering diet deprivation. Additionally, the study assesses their environmental footprint, focusing on water consumption, land use, and emissions. Investments in small and medium enterprise (SME) processors are shown to be the most cost-effective at expanding agrifood GDP and employment, while extension and advisory services on livestock and climate emerge as the most efficient farmer-facing investments. However, crop ex tension services rank least in cost-effectiveness for economic and social outcomes. However, many cost-effective investments have relatively high environmental footprints, which highlights potential tradeoffs. The study further reveals shifts in the cost-effectiveness ranking of investment options overtime and when extreme production shocks occur.

Year published

2025

Authors

Aragie, Emerta A.; Niyonsingiza, Josue; Thurlow, James; Warner, James; Xu, Valencia Wenqian

Citation

Aragie, Emerta; Niyonsingiza, Josue; Thurlow, James; Warner, James; and Xu, Valencia Wenqian. 2025. Rwanda: Cost effective options for inclusive and sustainable development. Agrifood Investment Prioritization Country Series Brief 2. Washington, DC: International Food Policy Research Institute. https://hdl.handle.net/10568/174468

Country/Region

Rwanda

Keywords

Africa; Eastern Africa; Sub-saharan Africa; Agrifood Sector; Sustainable Development; Poverty; Nutrition; Environmental Impact

Language

English

Access/Licence

Open AccessCC-BY-4.0

Source

Source record

Record type

Brief

Blogs

Shaping strategies for Rwanda’s agricultural transformation
IFPRI Blog
 | 
June 30, 2025

Shaping strategies for Rwanda’s agricultural transformation

By Maria DiGiovanni, James Warner, and Serge Mugabo

How IFPRI research helps guide policy.

Is Ethiopia missing a golden opportunity for addressing hidden hunger? The opportunities and challenges of biofortification
IFPRI Blog
 | 
August 18, 2023

Is Ethiopia missing a golden opportunity for addressing hidden hunger? The opportunities and challenges of biofortification

By Taddese Zerfu, Fantu Bachewe, Tirsit Genye, Meron Girma, Aregash Samuel, James Warner, and Cornelia van Zyl

A promising approach to micronutrient deficiencies.

Events

Africa Food Systems Forum 2024 Summit
IFPRI at External Event

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September 2 to 6, 2024

Africa Food Systems Forum 2024 Summit

The Africa Food Systems Forum 2024 annual summit will be a timely opportunity to convene diverse stakeholders, including world leaders, investors, academia, farmers’ organizations, and the private sector, to spotlight innovations, technologies, best practices, business models, policy delivery mechanisms, and investments to accelerate food systems transformation in Africa and beyond, with youth and women at […]

Using Satellite Imagery for Early Warning of Productivity Constraints
IFPRI Program/Country Event

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October 31, 2019, 11:00 – 12:30 pm

Using Satellite Imagery for Early Warning of Productivity Constraints

On October 31, the NASA Harvest Consortium in collaboration with the Food Security Portal will hold a webinar to discuss the potential of satellite imagery for food crisis early warning systems. This webinar will provide an opportunity to share the current state of knowledge and to identify areas new or further collaboration.  The 2019 Global […]

17th International Conference on the Ethiopian Economy
IFPRI Program/Country Event

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July 18 to 20, 2019

17th International Conference on the Ethiopian Economy

IFPRI is participating in the Ethiopian Economic Association (EEA) 17th International Conference on the Ethiopian Economy. The EEA is a not-for-profit association serving the professional interests of members working in agricultural and broadly related fields of applied economics.  Members of the EEA are employed by academic or government institutions, as well as in industry and not-for-profit […]

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