Abstract
Previous articleNext article FreeNBER Board of DirectorsPDF Add to favoritesDownload CitationTrack CitationsPermissionsReprints Share onFacebookTwitterLinkedInRedditEmail SectionsMoreDetailsFiguresReferencesCited by Innovation Policy and the Economy Volume 202020 Sponsored by the National Bureau of Economic Research (NBER) Article DOIhttps://doi.org/10.1086/707625 Views: 83 © 2020 by the National Bureau of Economic Research. All rights reserved. Crossref reports no articles citing this article.
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