The current incrementality plot contains the inputs such that each smaller input must be contained in the larger inputs. (That is, if your 3-item TURF has products A, B, C; then your 4-item TURF needs to have products A, B, C and something else).

This feature request is for a plot that shows the increment of increasing the portfolio size without considering the usual incrementality constraint.

That is, the plot would simply return the reach for the optimal output of a 1-item TURF, 2-item TURF, 3-item TURF, etc.