Amazon.com's fourth-quarter operating income rose 56 percent to $405 million, pushed higher by growth in higher-margin businesses, the company reported Tuesday.
Amazon's fourth-quarter revenue rose 22 percent to $21.3 billion.
Further, in 2012, Kindle e-book business revenue surged 70 percent. Amazon's physical book revenue rose 5 percent.
Details to follow.
Joseph Lazzaro, U.S. Editor, served as Managing Editor of New York-based financial news web sites WallStreetEurope.com/WallStreetItalia.com, 1999-2004, and as Economics...