In this paper, we attempt to build a new microeconomic approach that could be considered as a basis of the degrowth macroeconomic view. As degrowth is a critique of the dominant macroeconomic model of the endless search for economic growth, its microeconomic foundations can be built by searching a relevant grass-root economic initiative to theorise. Our approach is based upon the case study research of a self-harvesting Community Supported Agriculture in Belgium. The mainstream microeconomic model is based on the well-known Homo economicus assumption of individual self-interest and competitive behaviour. By contrast, our model is based on a holistic approach of producers and consumers, based upon trust, cooperation and ecologically responsible behaviours. This contribution participates to the flourishing literature on degrowth in Ecological Economics. We begin by reviewing the debate on degrowth and economic behaviour. We discuss the case study and its accounting expression that departs from the capitalist profit-seeking model. We conclude by explaining the limits and challenges of our model that implements degrowth on a small scale and in a capitalist environment.