In 2015, audiobook sales started to enjoy booming growth in the US and UK. It was the same year that novelist John Scalzi noted that the audiobook release of his new novel with Tor outsold both the ebook and hardcover formats two to one. Indie author Joanna Penn, around the same time, noted that audiobooks represented 5 percent of her overall book sales income—on par with or better than traditional publishing.
Since then, traditional publishing has enjoyed double-digit sales growth of digital audio every year, although for authors going it alone, the results can be decidedly mixed
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