Stock of Amazon.com, the largest online retailer, has lost 22 percent since it hit a record high in January, but it rose 2.9 percent Tuesday amid news Amazon’s video streaming has nearly tripled in a year and same-store sales grew 26.2 percent in March, year-over-year. Last week, Amazon added a new product: Fire TV, which pairs with Prime Instant Video. The device plugs into a TV set (like Apple TV) to grab movies, TV shows, and music from the Internet. It can also play video games.
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