Amazon sees lower operating profit this quarter, shares dip

Amazon.com Inc forecast an unexpected dip in operating profit for the current quarter, sending shares down more than 4 percent due to concerns about the costs of investments including new warehouses and video content. The world's largest online retailer also reported lower-than-expected fourth-quarter revenue and missed Wall Street targets for its closely watched cloud computing unit. Key to its plan is to entice sign-ups for Amazon Prime, its $99-per-year shopping club, which has led to users b