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Baalzamon said:
While it may very well be true (we all know vgchartz isn't 100% accurate), how exactly does Microsoft know they sold more units than Sony or Nintendo? With the way I have always understood numbers, console makers only know the amount of units they have shipped, not the amount stores have sold.

Could somebody explain this to me/


MS has the same data that all the other console makers have. Nintendo, Sony, and MS all know how much consoles their competitors sell.