The paper looks at the role of inventories in U.S. cycles and fluctuations. It concentrates on the goods-producing sector and constructs a model that features both input and output inventories. A range of shocks are present in the model, including sales, technology, and inventory cost shocks. It is found that the presence of inventories does not change the average goods sector–cycle characteristics in the United States very much. The model is also used to examine whether new techniques for inventory control might have been an important factor contributing to the decline in the volatility of U.S. GDP growth. It is found that these would have had little impact upon the level of volatility.