anchor: This would lead to the discount of 4.5a, which is where the lines cross in Figure 9. The third statement is that the workshare price should equal the marginal cost of the workshared product plus the unit opportunity cost of the program.
positive: The 4.5a discount is depicted by the crossing lines in Figure 9.
negative: Figure 9 doesn't have any lines related to the 4.5a discount depicted on it.