?url_ver=Z39.88-2004&rft_id=doi%3A10.1016%2Fj.econlet.2017.12.038&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Rungi&rft.au=Rungi%2C+Armando&rft.aufirst=Armando&rft.atitle=The+smile+curve+at+the+firm+level%3A+Where+value+is+added+along+supply+chains&rft.title=Economics+Letters&rft.date=2018&rft.volume=164&rft.pages=38-42&rft.issn=01651765&rft.genre=article