Regulatory standards and certification models are essential tools guaranteeing the authenticity of organic products. In particular, third-party certification is useful to consumers since it provides guarantees regarding production processes and food quality. In an attempt to cope with the costs and bureaucratic procedures related to the adoption of such certification, groups of small producers have begun to rely upon alternative quality assurance systems such as Participatory Guarantee Systems (PGS). This study contextualizes and analyzes the PGS scheme and describes the Brazilian Rede Ecovida de Agroecologia network. We then investigate the effect of various factors on Brazilian consumers’ purchasing behavior for organic products guarante...