The linkages referring to the _two-way_ movement and coordination between the different flows in the supply chain implies that ...

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both inbound and outbound activities on the two sides of the supply chain should be coordinated.

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information, money and goods can also flow in a reverse direction in the supply chain.

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the two flows of goods and information move in the direction towards the end customer.

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goods can flow from first-tier customers to second-tier customers.

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