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Table 6 Average increase in cost per customer for selecting a delivery time window (2)

From: Using an integrated order picking-vehicle routing problem to study the impact of delivery time windows in e-commerce

Number of customers Clustered customers Randomly spread customers
  2 h 4 h 2 h 4 h
50 6.3 1.82 6.88 2.54
100 3.92 0.87 5.18 1.89
150 3 0.69 4.22 1.47