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We show that (i) process innovation fosters (hinders) product innovation for the low-quality (high-quality) firm; (ii) the firm which is initially more efficient invests more than the rival in process innovation; (iii) if the initial differential between marginal costs is sufficiently high, the demand for the less efficient firm is nil and the duopoly equilibrium does not exist. <\/jats:p>","DOI":"10.1142\/s0219198911002952","type":"journal-article","created":{"date-parts":[[2012,1,20]],"date-time":"2012-01-20T11:11:58Z","timestamp":1327057918000},"page":"209-221","source":"Crossref","is-referenced-by-count":11,"title":["PROCESS AND PRODUCT INNOVATION IN A VERTICALLY DIFFERENTIATED INDUSTRY"],"prefix":"10.1142","volume":"13","author":[{"given":"EMANUELE","family":"BACCHIEGA","sequence":"first","affiliation":[{"name":"Department of Economics, University of Bologna, Piazza Scaravilli 2, 40126 Bologna, Italy"}]},{"given":"LUCA","family":"LAMBERTINI","sequence":"additional","affiliation":[{"name":"Department of Economics, University of Bologna, Strada Maggiore 45, 40125 Bologna, Italy"}]},{"given":"ANDREA","family":"MANTOVAINI","sequence":"additional","affiliation":[{"name":"Department of Economics, University of Bologna, Strada Maggiore 45, 40125 Bologna, Italy"}]}],"member":"219","published-online":{"date-parts":[[2012,4,5]]},"reference":[{"key":"rf1","first-page":"639","volume":"3","author":"Abernathy W. 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