Should you join Amazon Prime before the Big Spring Sale? Here's what it costs and what you get.

Amazon (AMZN) 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. Shares of this online retailer have returned +7% over the past month versus the Zacks S&P 500 composite's -1.

The shift in timing is likely to have consequences for both Amazon and its network of third-party sellers, who often rely on the event’s surge in customer activity. Prime Day has grown in significance since its introduction in 2015,