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The centre of gravity can give a reasonable location, but we can easily show one of itsweaknesses. Suppose you work in Alberta, Canada and want to deliver 20 tonnes of materials aday to Edmonton and 40 tonnes a day to Calgary. These two cities are connected by a straightroad 300 km long (see Figure 5.7). If the costs of getting deliveries from suppliers are the sameregardless of location, where would you build a warehouse?The centre of gravity is ((40 × 300 + 20 × 0)/60 = ) 200 km from Edmonton. A warehousehere would have to deliver 200 × 20 tonne/kilometres to Edmonton and 100 × 40 tonne/kilometresto Calgary, giving a total of 8000 tonne/kilometres. But if you built the warehouse inCalgary, you would only have to move 20 × 300 = 6000 tonne/kilometres to Edmonton. Thisgives one rule of thumb, which says that a good location is in the centre of highest demand.
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