Cette thèse évalue l'impact économique des politiques de qualité liée à l'origine en mobilisant des méthodes d'évaluation que nous adaptons à la spécificité des démarches de certification, notamment à leur dimension spatiale. Dans un premier temps, nous analysons l'effet de l'adoption d’une Appellation d’Origine Protégée (AOP) sur le prix ainsi que sur les coûts de production des producteurs de lait AOP en Franche-Comté, en exploitant la discontinuité géographique à la frontière (Geographic Regression Discontinuity). Dans un second temps, nous utilisons les méthodes d'appariement statistique pour analyser les hétérogénéités régionales en termes de prix et de coûts de production entre les régions Auvergne, Rhône-Alpes et Franche-Comté avant de nous intéresser aux effets à une échelle nationale. Enfin, nous évaluons l'effet de l'adoption d'une Indication Géographique Protégée (IGP) sur les prix payés aux producteurs de Café de Colombie à l'aide des méthodes comparatives (synthetic control methods). En moyenne, les résultats montrent un effet positif de l'adoption de l'indication géographique sur la performance économique des exploitations. Cependant, cet effet est hétérogène entre les filières et les régions d'origine des produits. / This thesis evaluates the economic impact of quality-related-to-origin policies using evaluation methods adapted to the specificity of such certifications, in particular, the spatial dimension. First, we analyze the effect of a Protected Designation of Origin (PDO) adoption on price and production costs of PDO milk producers in Franche-Comté using a Geographic Regression Discontinuity (GRD) design. Secondly, we use propensity matching methods to analyze regional heterogeneity in Auvergne, Rhône-Alpes, and Franche-Comté before focusing on the effect of the PDO adoption at a national level. Finally, we evaluate the effect of the adoption of a Protected Geographical Indication (PGI) on prices paid to Colombian coffee producers using synthetic control methods. Overall, we find that PDO and/or PGI adoption is associated with positive effects on farmers' economic performances. However, these effects are not homogeneously distributed.

<p>This dissertation extends our knowledge of digital affordances in communicating complex scientific information by building and testing a climate change adaptation website for the Colombian coffee sector, <a href="http://www.climaycafe.com/">www.climaycafe.com</a>. This project offers both a practical component (scholarship of engagement) and theoretical component (extension of our understanding of the objective/subjective nature of affordances). Practically, it seeks to create a collaborative and tailored science communication solution for improved information access to support climate change adaptation. Theoretically, it extends our understanding of affordances in a digital environment through a qualitative assessment, specifically how occupational identity influences the subjective nature of affordances. Data is gathered through an iterative qualitative assessment of users’ interpretation of the perceived affordances on the website. The results demonstrate that occupational identity has an influence on perceived digital affordances, particularly influenced by (1) Perceived Social Status of Occupation, (2) Perception of Value Based on Occupational Demands, (3) Occupational Influence on Perceived Reliability and (4) Usability Preferences Based on Occupation. We additionally found that as creators we can set general goals for digital tools and achieve general success in obtaining them, but ultimately the users will dictate their needs within this broader framework. Lastly, there is a self-identified need for more practical knowledge and information access for coffee farmers in these regions of Colombia around climate change adaptation.</p>