Two-Echelon Inventory Optimization for Imperfect Production System under Quality Competition Environment

Table 2

A comparison of the integrated model with and without investments.

Model without investment			Model with investment			Cost difference
						ΔTC	%TC^a
0.15	189.06	1466.58	178.62	1224.23	0.093	242.35	16.52
0.20	237.14	1879.69	169.81	1201.90	0.081	677.78	36.05
0.25	318.91	2354.98	162.86	1186.33	0.072	1168.65	49.62
0.30	369.23	2871.18	157.33	1176.33	0.064	1694.85	59.02
0.35	421.13	3476.24	146.23	1243.30	0.100	2232.93	64.23

Note: .