Logical and graphic model of the commodity (commodity stocks) flow motion in the process of reproduction

The idea of the interconnection of material flow and material stocks has been further developed in the paper, basing on which, the logical and graphic model of the commodity (commodity stocks) flow motion in the process of reproduction has been presented. It is proved that the commodity flow can be characterized by alteration of the stock amount, and that the stock is the result of changes in the intensity of the input and output material flow. The model suggestedconsiders different variants of models of possible chains.