When record companies and labels have bargained with
digital retailers to purchase a particular amount of digital downloads. This is practiced to push the position of a song to the top of the
charts when a song is lacking in
airplay
Gwen Stefani's label, Interscope, bought-out downloads for "Hollaback Girl" when it was at #12
airplay in order to bump "Candy Shop" before
Mariah Carey's "We Belong Together" took the #1 position.
Kanye West bought-out digital downloads for "Golddigger" when it was at #16 airplay so he could have a #1 single and #1 album at the same time.