Inventories exist throughout the supply chain in various forms for various reasons. Since carrying these inventories can annually cost from 20 to 40% of their value, managing them in a scientific manner to maintain minimal levels makes economic sense. This paper presents a near-optimal (s, Q)-type inventory policy for a multi -echelon production /distribution network with multiple non - identical suppliers. The model is a synthesis of three components: (i) the inventory analysis at the retailers, (ii) the demand process at the warehouse, and (iii) the inventory analysis at the warehouse. The key contribution of the model is the seamless integration of the three components to analyze simple supply chains. The decisions in the model were made through a comprehensive distribution-based cost framework that includes the inventory, transportation and transit components of the supply chain.