Mathematical Models
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Table 2

Computational results for problem size 3000 suppliers, 100 co-ops, and c customers.

Number of customers Execution time (s) Total distance in each cluster
Traveled distance in the system
Max Min Avg SD
MDSR heuristic
 100 2184.73 2371.53 371.73 1013.33 430.06 101 332.90
 200 2154.42 2455.63 395.40 1091.07 443.44 109 107.27
 300 2130.03 2567.30 408.63 1153.19 441.59 115 318.60
 400 2143.85 2658.77 478.73 1212.45 441.67 121 245.17
 500 2173.65 2836.92 591.21 1274.18 478.39 127 418.04
MDSRB heuristic
 100 28.03 1708.03 542.13 1103.95 283.52 110 394.97
 200 26.18 1801.57 663.17 1227.99 275.47 122 798.80
 300 29.07 1802.97 666.70 1262.40 276.23 126 239.87
 400 28.16 1859.37 693.03 1296.09 279.26 129 609.20
 500 26.60 2094.19 659.77 1335.52 347.92 133 552.00