Résumé
The integration of digital technology into food supply chains came with high expectations, particularly for improving farmers' sales conditions. In theory, digital tools are expected to provide access to commercial information and enable more direct relationships with consumers, thereby mitigating two issues that threaten farm profitability and even survival: transaction costs (Transaction Cost Theory) and commercial uncertainty (Resource Dependency Theory). However, solid empirical evidence is currently scarce. Therefore, the goal of this thesis is to assess the actual impact of digital technologies on the costs and uncertainty burdening farmers. To achieve this, we focus on soft, everyday technologies used by almost all farmers: social media, software, and online sales platforms. We conducted representative quantitative surveys of French market gardeners, who are highly concerned about costs and uncertainty, as well as semi-structured interviews to gain deeper insight into their strategies. We also surveyed managers of online sales platforms to better understand how they interact with farmers. The resulting data are analysed using a range of methods, including propensity score matching and Qualitative Comparative Analysis (QCA). The results demonstrate that digital tools can reduce both transaction costs and market uncertainty. Their impact varies depending on the farmer's sales strategy, specifically whether they sell directly or indirectly to consumers. Transaction costs are reduced when farmers use digital tools for marketing and communication. For those selling directly, this improves sales conditions; for those selling indirectly, it enhances the customer relationship. However, information-sharing tools benefit direct sellers but increase transaction costs for indirect sellers because they create greater information asymmetry. Regarding platforms, we observed that some use strategies that limit interaction between farmers and customers, thereby driving up transaction costs. Market uncertainty can be reduced by using digital tools to organise sales, especially for order-taking, both for direct and indirect sales. Platforms offer two effective strategies for reducing uncertainty, based on how they operate. Platforms that include farmers in their governance and encourage exchange with consumers provide a reliable, long-term outlet to stabilise farmers' sales. Platforms requiring low farmer involvement can serve as an 'adjustment' outlet for dealing with surpluses or issues with farmers' regular sales channels. This research shows that digital tools are one lever for farmers to improve their sales conditions. However, it is not a one-size-fits-all solution. It is therefore crucial to clarify these effects so that farmers can select the tools best suited to their own strategy and objectives.