My publications

Academic writing

Please email me if you are interested in pdf versions of any of these papers!

Refereed journal articles

Dietz, T., Grabs, J., & Estrella Chong, A. (2019). The effectiveness of mainstreamed Voluntary Sustainability Standards – Evidence from the Honduran coffee sector. Regulation & Governance, in print.

Abstract: Voluntary Sustainability Standards have become a popular private governance framework for more sustainable agri-food value chains. Yet, amidst increasing concerns over the decoupling of standards and practices, it is still unclear to what extent agricultural standard requirements are implemented on the ground, and what may account for such differential implementation. This study employs a novel dataset of 659 Honduran coffee producers to examine this puzzle, focusing on the most widely used standards in the coffee sector (4C, Fairtrade, Fairtrade/organic, UTZ Certified and Rainforest Alliance). It first presents results on implementation and behavioral change, based on matched groups of certified and non-certified farmers, for eight representative social and environmental sustainability practices. Analyzing determinants of implementation success, it finds that the stringency of rules – if they are known by farmers – and the level of farm-gate prices are significantly correlated with farmers’ performance and lower levels of decoupling across a majority of indicators. These results speak to the importance of supporting small-scale actors’ awareness of and financial capacity to comply with proposed sustainability rules.

Grabs, J. (2018). Assessing the institutionalization of private sustainability governance in a changing coffee sector. Regulation & Governance, early view.

Abstract: The potential of transnational private governance initiatives to constitute effective alternatives to state-led regulation of global value chains rests on their ability to scale up and become institutionalized in a given sector. This study examines whether such institutionalization has occurred in the coffee sector, the commodity with the most widespread adoption of certified products and over 30 years’ experience of private governance, and tests hypotheses on facilitating and inhibiting conditions. It finds that while norm generation around responsible supply chain management and the organizational institutionalization of standard-setting bodies is well advanced, the practice of internalizing social and environmental externalities through the routinized production and purchase of higher priced certified goods continues to be questioned by industry actors. Indeed, conditions that favored normative and organizational
institutionalization, such as high levels of industry concentration, product differentiation, and deliberative interaction, are shown to represent barriers to the practice-oriented institutionalization of market-driven regulatory governance.

Dietz, T., Auffenberg, J., Grabs, J., Estrella Chong, A., & Kilian, B. (2018). The Voluntary Coffee Standard Index (VOCSI). Developing a composite index to assess and compare the strength of Mainstream Voluntary Sustainability Standards in the global coffee industry. Ecological Economics, 150, 72-87.

Abstract: Over the last years, key players in business, politics and civil society have promoted Voluntary Sustainability Standards (VSS) to shift global markets towards more sustainable value chains. In this article, we develop a new methodological approach (composite indices) to assess and compare the strength of competing voluntary sustainability standards (VSS). We apply this approach to all major VSS in global coffee production. In detail, we identify 92 regulatory topics relating to sustainability improvements in global coffee production through VSS. We weight these indicators and develop a coding system to evaluate how strongly each VSS addresses each of the 92 regulatory topics. The results show four sub-indices that compare the strength of the different VSS within the four main regulatory areas of sustainable development: (I) environmental sustainability (II), social sustainability, (III) economic sustainability and (IV) compliance enforcement. Aggregating these sub-indices build the “Voluntary Coffee Standards Index” (VOCSI) that compares the strength of VSS across the four main regulatory areas. We evaluate the robustness of the index and correlate the VOCSI with the amount of coffee certified to examine the relationship between the strengths of a standard and its proliferation.

Dietz, T., Estrella Chong, A., Font Gilabert, P., & Grabs, J. (2018). Women’s empowerment in rural Honduras and its determinants: insights from coffee communities in Ocotepeque and CopanDevelopment in Practice28(1), 33-50.

Abstract: This article quantifies the level of women’s empowerment in western Honduran coffee-producing households through the construction of the Women’s Empowerment in Agriculture Index, and highlights the determinants of each empowerment indicator and their interactions. Women in the study region suffer from a lack of control over use of income and access to productive resources. Since control and ownership of assets are positively correlated with input in productive decisions and control over the use of income in this study region, it is suggested that “low-hanging fruit” to improve empowerment would be to invest in interventions that strengthen asset control and distribution.

Grabs, J., Kilian, B., Hernández, D. C., & Dietz, T. (2016) Understanding coffee certification dynamics: A spatial analysis of Voluntary Sustainability Standard proliferation. International Food & Agribusiness Management Review19, 31-55.

Abstract: Third-party Voluntary Sustainability Standards (VSS) have emerged as an increasingly popular strategy to guarantee sustainability in the coffee value chain. Yet, knowledge of the population characteristics of certified farmers, and of the influence of transnational and local supply chain actors on the uptake of VSS at the producer level, is still scarce. Using expert interviews, a comprehensive database of certificate holders and spatial mapping analyses, this paper adds to present knowledge concerning the effectiveness of VSS in the coffee sector in three ways. First, it showcases the structural, geographical and socio-economic tendencies toward VSS adoption in Guatemala, Colombia and Costa Rica, and allows first insights in the additionality and effectiveness of certification schemes derived from these indicators. Second, it contributes to an up-to-date understanding of the coffee supply chain, a sector of great economic importance both to producing and consuming countries that is in constant flux and reorganization, and it explains how current VSS interact with this type of global supply chain. Finally, through the construction of a comprehensive population of certified farmers, it enables better evaluation of existing case studies, generalizability, possible biases and provides valuable information for the preparation of future impact evaluation projects.

Grabs, J., Langen, N., Maschkowski, G., & Schäpke, N. (2016) Understanding role models for change: A multilevel analysis of success factors of grassroots initiatives for sustainable consumption. Journal of Cleaner Production134, 98-111.

Abstract: In order to achieve sustainable societies, we need models of behavior that go beyond individuals equating wellbeing and material consumption levels. Lowering individual footprints might be more acceptable once we include social relations, adopting responsibilities for other human and non-human life as well as civic engagement as complementary sources of wellbeing. Grassroots initiatives that stimulate collective action and social learning contribute to these diverse sources of wellbeing when striving to facilitate sustainable consumption. Thus, they can become role models for societal change. This review sets out to investigate why grassroots initiatives are created and developed successfully by focusing on the processes of founding, engaging in, developing and maintaining grassroots initiatives. We look at insights from different disciplines that address behavioral change and social learning to develop an overview of factors that are from an interdisciplinary perspective highly relevant to understand societal change processes. By means of organizing the analysis along three levels of human behavior – the individual level, the group level, and the societal level – we capture the multifaceted relationships influencing the success of grassroots initiatives. We present theoretical and empirical evidence connecting a broad spectrum of concepts that can subsequently be used as testable factors in fieldwork for in-depth investigations of grassroots success.

Grabs J. (2015) The rebound effects of switching to vegetarianism. A microeconomic analysis of Swedish consumption behavior. Ecological Economics116, 270-279.

Abstract: Sustainable diets, in particular vegetarianism, are often promoted as effective measures to reduce our environmental footprint. Yet, few conclusions take full-scale behavioral changes into consideration. This can be achieved by calculating the indirect environmental rebound effect related to the re-spending of expenditure saved during the initial behavioral shift. This study aims to quantify the potential energy use and greenhouse gas emission savings, and most likely rebound effects, related to an average Swedish consumer’s shift to vegetarianism. Using household budget survey data, it estimates Engel curves of 117 consumption goods, derives marginal expenditure shares, and links these values to environmental intensity indicators. Results indicate that switching to vegetarianism could save consumers 16% of the energy use and 20% of the greenhouse gas emissions related to their dietary consumption. However, if they re-spend the saved income according to their current preferences, they would forego 96% of potential energy savings and 49% of greenhouse gas emission savings. These rebound effects are even higher for lower-income consumers who tend to re-spend on more environmentally intensive goods. Yet, the adverse effect could be tempered by purchasing organic goods or re-spending the money on services. In order to reduce the environmental impact of consumption, it could thus be recommended to not only focus on dietary shifts, but rather on the full range of consumer expenditure.

Book chapters

Maschkowski, G., Schäpke, N., Grabs, J., & Langen, N. (2016) Learning from co-founders of grassroots initiatives: personal resilience, transition, and behavioral change – a salutogenic approach. In: Henfrey T., Maschkowski G. (eds.) Resilience, Community Action and Societal Transformation 2016. East Meon: Permanent Publications and Bristol: Good Works.

Working papers

Grabs, J. (2017) The Rise of Buyer-Driven Sustainability Governance: Emerging Trends in the Global Coffee SectorZenTra Working Paper in Transnational Studies No. 73 / 2017.

Abstract: The coffee industry connects millions of smallholder farmers with global markets and has historically been a frontrunner in sustainability efforts. Yet, the governance of this value chain and its sustainability depends on the distribution of power between market actors. This paper applies a Global Value Chain approach (Gereffi, 1999) to characterize the current distribution of power and opportunities in the coffee sector, and examines how this characterization has influenced the sector’s non-state market-driven (NSMD) sustainability governance structure (Bernstein and Cashore, 2007). The study finds that in a strongly buyer-driven chain, the reinterpretation of sustainability as supply chain management has led to the emergence of more company-owned standards and direct-impact projects as alternatives to third-party certification schemes, as well as their coordination in pre-competitive sectoral platforms. The simultaneous rise of producing-country definitions of sustainability points to a continued fragmentation of sustainability governance and a loss of authority of traditional NSMD channels.

Non-academic writing


Food Policy for Thought (since 2013)

Magazine articles

The coffee price crisis and price volatility: Can we tame the C-market? 25 Magazine. Issue 7. December 2018.

The hunt for new niches. Climate-friendly coffee production in Costa Rica. Internationale Politik. Special Issue Mercator Kolleg 2015. January/February 2016.

Jagd nach neuen Nichen. Klimafreundliche Kaffeeproduktion in Costa Rica. Internationale Politik. Sonderbeilage Mercator Kolleg 2015. January/February 2016.

Fleischproduktion. Der vergessene Sektor in der Klimadebatte. Adhoc International. Issue 14: Klima und Mensch im Wandel. Wege in eine klimafreundliche Zukunft. December 2015

Zukunft für den Acker? Die Lösungen der Kleinbauern. Adhoc International. Issue 14: Klima und Mensch im Wandel. Wege in eine klimafreundliche Zukunft. December 2015 (co-authored by Julia Harrer and Loredana Sorg)

Home-Grown Hunger. The Struggle for Food Sovereignty in Canada’s North. GUTS Canadian Feminist Magazine. Food/Land Issue. November 2015

Can the Sharing Economy Revolutionize Consumption Patterns? Emanate Magazine. Issue 11: Innovating Against Crisis. February 2014

Sustainability Starts on Your Plate. Emanate Magazine. Issue 10: Sustainability. June 2013


Editor and Photo Editor: Adhoc International. Issue 14-16.

Editor-in-Chief: Samizdat. The McGill Russian Undergraduate Journal. Volume 1. 2012-2013

Co-Editor-in-Chief: McGill Journal of Political Studies. Volume 3. Winter 2012

Guest posts and contributions

Farm Profitability Q&A. SCA News, January 2019

How Kenneth Lander and THRIVE Farmers Are Revolutionizing the Coffee Supply Chain. Food Tank, June 2015

Las Lajas: The Micro-Coffee Mill Proving that Small Is Beautiful. Food Tank, June 2015

Costa Rica’s Pineapple Monopoly Not So Sweet. Food Tank, May 2015

Klimafreundlicher Kaffee aus Costa Rica: Ein Beitrag zu emissionsarmer Wirtschaftsentwicklung. Newsletter der deutschen Botschaft Costa Rica, June 2015 (co-authored by Andreas Nieters)

High Food Prices and Obesity in Costa Rica. Food Tank, April 2015

Organic Farming and Climate-Smart Agriculture – A Complicated Relationship. Nefia, November 2014

UN Special Rapporteur on the Right to Food consults with Québec civil society. Food Secure Canada, May 2012