As the discount level (on the horizontal axis) gets up to e of a cent, 20 billion pieces become presorted.
On the horizontal axis, the discount level remains flat at 0 and no pieces are presorted.
mnli hypothesis: On the horizontal axis, the discount level remains flat at 0 and no pieces are presorted. premise: As the discount level (on the horizontal axis) gets up to e of a cent, 20 billion pieces become presorted.