"Peace is not simply the absence of warfare."

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But even in the absence of direct interference by those who had the power to interfere, the process was usually aborted by the non-availability of one of more elements of the process - the accumulated stock in a money form, the labor-power to be utilized by the producer, the network of distributors, the consumers who were purchasers. One or more elements were missing because, in previous historical social systems, one or more of these elements was not commodified or was insufficiently commodified.

— Immanuel Wallerstein