The flows in a general minimum cost network flow model (MCNFM)all have to be from "left to right"; that is,from supply points to demand points.

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In a general minimum cost network flow model (MCNFM), flows do not have to follow a "left to right" direction; they can move in any direction as defined by the network's arcs and the problem's constraints, aiming to minimize the total cost.

The Flows in a General Minimum Cost Network Flow Model