Does this explain away Paula Abdul's entire career? She had hit after hit before they changed their tabulation method in the early 90s and had another song flying up the charts. That song dropped like a rock and she never had another hit!
Actually what this explains is the week in 1964 that the Beatles held down all five top positions in the chart. Even as a Beatle honk myself, I never understood how that was physically possible even at the height of Beatlemania in 1964. It wasn't that the public was buying all five of those records in amounts that would account for such a phenomenon (although they were buying them in droves too, for sure), but more than that, it was that record stores were ordering every Beatles disc they could get their hands on as quickly as possible, so they mass ordered all five available singles. One of my life's mysteries is now solved.