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4.1 Introduction

Inventory management and transportation have been the principal areas of focus in industrial engineering and management for a long time. Inventory management attracts considerable attention in logistics and supply chain management today because new supply chain models have become more integrative and complex. New market forces have introduced many complex elements which affect the performance of the supply chain in general and inventory level in particular. Inventory decisions are high risk and high impact for supply chain management. The general trend in the industry is to reduce the level of inventory at all levels in the supply chain. In fact since 1985, the USA economy has achieved a gradual reduction in the percentage of inventory carrying cost to the GDP from 5.4% to 3.8% (Coyle at al 2003). This is a significant achievement since at the same time firms have greatly increased their customer service levels.

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