Costco (COST) is one of the stocks most watched by Zacks.com visitors lately. So, it might be a good idea to review some of the factors that might affect the near-term performance of the stock.Over the past month, shares of this warehouse club operator have returned +4.4%, compared to the Zacks S&P 500 composite's +1.6% change. During this period, the Zacks Retail - Discount Stores industry, which Costco falls in, has gained 2.6%. The key question now is: What could be the stock's future direction?While med ...