In two passages of Production of Commodities, Sraffa states very concisely that the analysis presented also applies to viable economic systems in which the means of production consumed are not fully replaced. This aspect of the book has been nearly ignored for a long time, and only in the last two decades have some scholars begun to discuss it in depth. Since these scholars basically rely on the terse references to non-self-replacing systems appearing in Sraffa’s published works, however, a question is left pending in their contributions—what exactly was Sraffa’s position as regards the nature and relevance of those systems? The present note seeks to shed light on this question by systematically examining the pertinent passages of Sraffa’s unpublished manuscripts. On the basis of this examination, the final section briefly comments on some debatable aspects of current renditions of Sraffa’s theory.

中文翻译：

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Sraffa 关于非自更换系统：一个说明

在《商品生产》的两篇文章中，Sraffa 非常简洁地指出，所呈现的分析也适用于其中所消费的生产资料未被完全取代的可行经济系统。长期以来，本书的这一方面几乎被忽视，直到最近二十年才有一些学者开始深入讨论。由于这些学者基本上依赖于出现在 Sraffa 已发表作品中对非自替换系统的简短引用，然而，他们的贡献中留下了一个问题——Sraffa 对这些系统的性质和相关性的立场究竟是什么？本说明旨在通过系统地检查 Sraffa 未发表手稿的相关段落来阐明这个问题。在这次考试的基础上，