We consider a single-product, discrete-time production/inventory-control problem with nonstationary concave nondecreasing costs. Given a forecast horizon K, the problem is to find a decision horizon. We specialize to piecewise linear costs a general approach whereby a problem with horizon K + 1 and arbitrary final demand is parametrically solved. The resulting algorithm is polynomial in the input size.
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Bensoussan et al. (1991) studied this question.
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