Costco Wholesale (NASDAQ:COST) has outperformed the market over the past 15 years by 8.16% on an annualized basis producing an average annual return of 20.3%. Currently, Costco Wholesale has a market capitalization of $400.58 billion. Buying $1000 In COST: If an investor had bought $1000 of COST stock 15 years ago, it would be worth $16,225.00 today based on a price of $903.57 for COST at the time of writing. Costco Wholesale’s Performance Over Last 15 YearsFinally — what’s the point of all this? The key insight to take from this article is to note how much of a difference compounded returns …