Is Now the Worst Time to Buy Costco Stock?

The popular retailer has a lot going for it, but the stock has become extremely expensive.The stock of Costco Wholesale (COST -0.07%) has had an incredible market-beating run over the past few decades. It's really a no-brainer buy, with all sorts of positive qualities, and it should have lots more room to grow. However, it's trading close to its highest valuation ever. Is now the worst time to buy?Why Costco stock is a no-brainer to ownCostco has a membership model that yields loyalty from shoppers who want ...