How did SL sell 3 million copies outside the US before November 2009?
This is why IFPI can't be trusted.
SL did well in major markets (Australia, Canada, UK) so it's not that hard to believe it sold 3M outside the US. And why isn't IFPI reliable but mediatraffic is?
WFL has clearly sold more than SL if this was what the whole comparison was about. But to claim IFPI is unreliable over Mediatraffic is just.... You can cite IFPI as an official source if you were writing a paper. Sadly, you can not do the same for Mediatraffic