Did Costco's Earnings Really Give Investors Something to Worry About?

It's hard to be a leader. Costco Wholesale (NASDAQ: COST)has developed a reputation for dominating the big-box retail space, with a loyal group of customers who count on getting bargain deals when they shop at its warehouse locations. Even as the growing trend away from brick-and-mortar locations toward e-commerce has punished many of its competitors, Costco still has managed to find ways to grow and keep its shoppers coming in through its doors.