"The number of published authors per year increased nearly tenfold every century for six centuries. By 2000, there were 1 million book authors per year. One million authors is a lot, but they are only a tiny fraction, 0.01 percent, of the nearly 7 billion people on Earth. Since 1400, book authorship has grown nearly tenfold in each century. Currently, authorship, including books and new media, is growing nearly tenfold each year."(http://seedmagazine.com/content/artic...)
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