?url_ver=Z39.88-2004&rft_id=10.1111%2Fjoie.12228&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Bardey&rft.aufirst=David&rft.issue=n%C2%B0+3&rft.volume=vol.+68&rft.date=September+2020&rft.issn=0022-1821&rft.atitle=Controlling+sellers+who+provide+advice%3A+regulation+and+competition&rft.title=Journal+of+Industrial+Economics&rft.pages=409-444&rft.genre=article