We also observed that the exchange of monomers/oligomers between the fibres and the environment occurs mostly via the fibre tips. Exchange of monomers/oligomers from the fibre-bulk was detected with an occurrence of < 0.001% of the binding/unbinding events. Generating well-ordered fibres via directional interactions (negligible solvophobic interactions), the M model mimics the case of supramolecular polymers in a good solvent, where molecular exchange occurs preferentially from the fibre tips. Monomer exchange from the fibre bulk is instead typical of systems dominated by non-directional/solvophobic effects, where defects along the fibres govern the monomer dynamics. From the transition probabilities it is possible to build diagrams of the dynamic interconnections between assemblies in these systems (see e.g., Figure ). The results obtained with such a minimalistic model highlight the complexity of the dynamic equilibrium in elementary supramolecular systems. It is interesting to investigate if such complexity is encountered also in more realistic supramolecular polymer models, and what aspects are unavoidably over-simplified and overlooked.