So, who is number one on the charts?

via From Mozart To Adele To Chance The Rapper, Measuring Album Sales Means Being Specific : NPR

A short and to the point look at the music biz that raises larger questions. Look at how much trouble we now have at determining what a “sale” is, who “sold” the most, who is at the “top of the charts”. So how do we have “facts” anymore? And if sales/facts are this problematic, then how do we go about determining who the most “consumed” artist was?

The seemingly larger question is does this kind of “difficulty” extend to other fields? However, my question, is this seeming “difficulty” a bad thing? What if it encourages new ways of perception, new ways of determining and organizing knowledge?