Internal analysis helps companies understand why differences in firm performance exist even within the same industry. Companies that compete in the same industry face similar external opportunities and threats; therefore, any observable performance difference must be found inside the firm. Think about the internal resources, capabilities, core competencies, and value chain of Costco stores.

Now extend beyond the asset base and use the VRIO framework to identify the competitive position held by Costco stores. Which, if any, of these resources are helpful in sustaining Costco stores' competitive advantage?

Please post references/citations for your reply.