4Q Operating Income Up 56%

By @JosephLazzaro on'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.





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