Industrial symbiosis. A concept that can be either narrowed to the known role, at industrial level, of partnership, or developed into a 360-degree view. In the case of the circular economy, grafted onto sustainability, the latter solution is necessary in order to find solutions to today’s challenges. Indeed, because when low-intensity matter and energy sources are used, such as those derived from biomaterials or residues from industrial processing, it is necessary to exploit their full potential. But it is not an easy thing to do, given the current production and market contexts. In order for the industrial practices linked to the circular economy to be effective they must abide by specific rules. First and foremost is that of the market, i.e. the extra cost compared t...