The Gravity of Knowledge
The American economic review, 2013-06, Vol.103 (4), p.1414-1444 [Peer Reviewed Journal]Copyright© 2013 The American Economic Association ;Copyright American Economic Association Jun 2013 ;ISSN: 0002-8282 ;EISSN: 1944-7981 ;DOI: 10.1257/aer.103.4.1414 ;CODEN: AENRAA
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