?url_ver=Z39.88-2004&rft_id=10.1257%2Fmic.20180225&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Cr%C3%A9mer&rft.aufirst=Jacques&rft.issue=n%C2%B0+4&rft.volume=vol.+12&rft.date=November+2020&rft.issn=1945-7669&rft.atitle=The+value+of+incumbency+when+platforms+face+heterogeneous+customers&rft.title=American+Economic+Journal%3A+Microeconomics&rft.pages=1-43&rft.genre=article