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households spend more than half of 1 percent of their time online at Wikipedia. The site produces nothing pecuniary owing to its ban on advertising. Yet, it is clearly preferred by many readers, at least judging by the declines in both MSN's Encarta and traditional encyclopedias. Because household revenue for access comes in at more than $35 billion, a reasonable first guess puts Wikipedia's value at more than $175 million in unmeasured revenue a year in US GDP.