One can see that both B-PTP and BD-PTP bilevel programming models have achieved an improvement in production costs (leader's objective), and deterioration in transportation costs (follower's objective). In both cases the overall costs (production and transportation costs) were slightly greater than in PTP and D-PTP models.
Table 3 shows the comparison of the results for the data set 2 in terms of different objective function values appearing in four models compared. As for data set 1, for each model we compare the optimal value of production costs (leader's objective in B-PTP and DB-PTP), transportation costs (follower's objective in B-PTP and DB-PTP), as well as the overall costs (objective in PTP and D-PTP).