The document proposes a provisional model for determining value-added services through analyzing the economies of inventory management within globally dispersed value chains. It explores the tradeoffs between transaction costs and product diversification, and between pooling and postponement economies. The model makes assumptions that the value chain is fixed, demands request the same services, and distribution of demand is known. It then analyzes scenarios involving different combinations of pooling and postponement to understand where the greatest inventory stock savings and economies can be achieved. The analysis aims to validate the need for a more general model of inventory economies within global value chains.