In the mole ratio 0.67 at pH 3.9 system, we observe a micelle growth region following cubic power law growth behavior for the 40 3 system (Fig. ). Upon enlarging the box to 50 the cubic power law behavior disappears, leaving a system that appears to grow linearly. Comparing Figs. and, which explore the shape metrics for the mole ratio 0.67 at pH 3.9 systems in 50 3 and 40 boxes, respectively, shows that the smaller of the two boxes presents with more WLMs and fewer rods, as can be expected based on previous discussion. For the larger box, the onset of 2D extended structures, as determined by the shape metrics, is later than that for the smaller box. Both systems present similar degrees of branching although there appears to be more branching earlier for the larger box. For both box sizes, the total fraction of 2D extended structures is comparable at the final time unit. Deviation from the linear behavior of the 40 3 box occurs at the point at which the 2D extended structures appear in the analysis of the shape metrics (≈ 6 000 DPD time units). We postulate that the deviation is much smaller in Fig. enabling the behavior to be classed as linear for the entire duration. It is possible that larger boxes require more / larger degrees of branching to register significant deviation from linear behavior on the time scales sampled here. This requires further testing.