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Chart below is from O’Reilly Research. Meanwhile O’Reilly Radar reports: "The number of premium priced Books (i.e., those priced at $10 or more) has grown from roughly 1 in 50 Books 12 weeks ago, to 1 in 10 during the most recent week." Also see post from Joe Wikert on app pricing experimentation. (Via Peter Brantley.)

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