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The English Wikipedia passed the mark of two million articles on September 9, 2007, making it the largest encyclopedia ever assembled, surpassing even the 1408 Yongle Encyclopedia, which had held the record for almost 600 years.
Though the English Wikipedia reached three million articles in August 2009, the growth of the edition, in terms of the numbers of articles and of contributors, appears to have peaked around early 2007.
On most articles, anyone can undo others' changes by clicking a link on the article's history page.Modifications to all articles would be published immediately.As a result, any article could contain inaccuracies such as errors, ideological biases, and nonsensical or irrelevant text.Due to the increasing popularity of Wikipedia, popular editions, including the English version, have introduced editing restrictions in some cases.
For instance, on the English Wikipedia and some other language editions, only registered users may create a new article.
In 2003, economics Ph D student Andrea Ciffolilli argued that the low transaction costs of participating in a wiki create a catalyst for collaborative development, and that features such as allowing easy access to past versions of a page favor "creative construction" over "creative destruction".