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Because of potential compositional changes in Internet users, I examine identifying assumptions for the DD estimator under compositional changes and develop a test for identifying restrictions. To address potential bias due to compositional changes, I extend DD matching estimators to the case of two\u2010variate propensity scores. I find evidence suggesting that file sharing is likely to explain 20% of total sales decline, which is driven by households with children aged 6\u201317. Copyright \u00a9 2011 John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/jae.1269","type":"journal-article","created":{"date-parts":[[2011,10,6]],"date-time":"2011-10-06T00:03:17Z","timestamp":1317859397000},"page":"297-324","source":"Crossref","is-referenced-by-count":62,"title":["MEASURING THE EFFECT OF NAPSTER ON RECORDED MUSIC SALES: DIFFERENCE\u2010IN\u2010DIFFERENCES ESTIMATES UNDER COMPOSITIONAL CHANGES"],"prefix":"10.1002","volume":"28","author":[{"given":"Seung\u2010Hyun","family":"Hong","sequence":"first","affiliation":[{"name":"Department of Economics University of Illinois at Urbana\u2010Champaign  IL USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2011,10,5]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/0034-6527.00321"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.3982\/ECTA6474"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1080\/01621459.1992.10475212"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.2307\/2297863"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1468-0262.2006.00668.x"},{"key":"e_1_2_10_7_1","doi-asserted-by":"crossref","unstructured":"BattistinE.2003.Errors in survey reports of consumption expenditures. 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