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In 1987, a publication will appear closely related to this one. It will contain a purely analytical derivation of the numerical results presented in this paper. Furthermore, it will contain a more general numerical optimization model, where any first order autoregressive price process and any price-age relationship can be used. Hence, this paper is a &quot;popular&quot; version of the final paper. Preliminary results show that the qualitative results discussed in this paper hold in very general cases.</abstract>
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