In 2003, the world produced about 800MB of information for each man, woman, and child on earth [2]. Much of this information, such as supermarket scanner data and the like, is pretty dull. But some of it, such as the material contained in books, magazines, newspapers, movies, music, and family photos, is potentially of great interest to people.
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Hal R. Varian (2005) studied this question.
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