In the management of a supply chain, what goes out is as important as what comes in. Just how important was demonstrated in December, when, swamped by last-minute orders and beset by bad weather, United Parcel Service and FedEx failed to deliver many gifts in time for Christmas. Also drawing attention that month was the revelation that Amazon is developing un- manned “octocopter” drones that, in theory, could deliver pack- ages to doorsteps

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