Album sales suffered dramatically in 2nd gen. Top groups like TVXQ, SUJU, BigBang, and SNSD couldn't get close to 1 million for one album.
But when 3rd gen started (after everyone got over the initial thrill of digital purchases and wanted to go back to physical media) album sales begin to climb like never seen before.
So who's more responsible for this revival?
EXO (and their repacks) or BTS (and their coat tail riding off of EXO-L's mentality of collecting everything)?