The Long Shadow of Patent Expiration. Generic Entry and Rx-to-OTC Switches

Ernst R. Berndt, Margaret Kyle, and Davina Ling, Scanner Data and Price Indexes (University of Chicago Press, 2003), chap. 8, https://www.nber.org/books-and-chapters/scanner-data-and-price-indexes/long-shadow-patent-expiration-generic-entry-and-rx-otc-switches.