Final answer:
Major retail stores are combatting Internet sales by sharing and integrating inventories, leveraging both their physical and online presence, as seen in Amazon's adaptation through large, computerized warehouses and retail stores.
Step-by-step explanation:
The question addresses how major retail stores are adapting to compete with Internet sales. To offset Internet sales, some major retail stores are integrating their inventories as well as sharing inventory among different locations. This dual strategy shares inventory to reduce overhead costs and integrates inventories to streamline operations, ensuring products are available across multiple channels. This approach allows brick-and-mortar retailers to respond more fluidly to consumer demands, and enables them to utilize both their physical stores and online presence more effectively. Amazon's evolution is a prime example; it expanded from an online-only platform to incorporating physical retail stores in several states while maintaining large, computerized warehouses to keep costs down and achieve economies of scale.