Low, flexible pricing structure has enabled Costco Wholesale Corp. to become one of the most successful retail chains during the economic recession. Costco is the 9th largest retailer in the world by market capitalization, and recently was ranked by Fortune Magazine as the 22nd most admired company. On the University of Michigan’s American Consumer Satisfaction Index, it ranks tops among retailers. Costco has grown over the 27 years of its existence into a global company that owns 573 warehouses and plans to open another nine over....