Marginal cost (benefit) is the change in total cost (benefit) caused by an incremental change in the level of activity (Thomas & Maurice, 2012, pp. 95). In these definitions, incremental refers to a small change from the total level of activity. Marginal cost is representative of the slope of the total cost curve and marginal benefit is the slope of the total benefit curve. The intersection of these two lines on a graph represents the point at which the net benefit is maximized, or the optimal level of