Shares have returned more than 700% in the last decade.With $62 billion in net sales in the fiscal 2025 third quarter (ended May 11), Costco Wholesale (COST 0.42%) is the world's third-biggest retailer. Only Walmart and Amazon are above it on the leaderboard. Costco is clearly a dominant force in the industry, and investors have been rewarded. Shares have generated a total return of 733% in the past decade (as of Sept. 10). Should you buy this blue chip stock right now? Scale creates an advantageThere is m ...