One of the biggest problems an online retailer faces is:
-the failure to create "clicks to bricks" order fulfillment systems.
-the lack of spontaneous rather than planned purchases that traditional retailers enjoy.
-customers' tendencies to get to the checkout and leave the website without concluding the purchase.
-the difficulty of actually placing the online purchase.
-the slow growth of online purchasers from consumers living outside the U.S.
Answer: customers' tendencies to get to the checkout and leave the website without concluding the purchase.