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“This is a big win for Kindle owners,” Amazon spokesman Andrew Herdener said in a statement, “and we look forward to being allowed to lower prices on more Kindle books.”

Apple, Macmillan and Pearson PLC’s Penguin Group plan to fight the antitrust lawsuit.

Apple, the world’s most valuable company, Tuesday became just the second company in history to reach the $600 billion level. But it shares fell Wednesday to $626.20, down $2.24 from the previous day’s close, after news of the lawsuit broke.