Measuring the market

<p>New children's chart is part of learning process</p><p>Why reproduce a bestseller chart, as The Bookseller does this week (pages 22 and 23), based on publishers' own figures, when ones using objectively verified sales data are available? In the case of Alex Hamilton's annual list of the fastselling paperbacks (The Bookseller, 9th January), the answer is that the top 100 chart includes data that Nielsen BookScan cannot capture; export sales, as well as sales through channels that are not part of the BookScan universe. Nevertheless, the Hamilton list broadly reflects the BookScan bestsell...

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