A “data commons” movement has created websites for people to post and link their data with others. In the last ten years, the norm of sharing datasets has become increasingly grounded in academics. The premier economics journal in the United States, the American Economic Review, requires that researchers post to a centralized website all the data backing up their empirical articles. So many researchers are posting their datasets to their personal web pages that it is now more likely than not that you can download the data for just about any empirical article by just typing a few words into
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