Sales and Shipments
It appears that the RIAA has been misleading the public about the supposed crisis in album sales, while the Nielson Ratings indicates that sales are just fine. The problem is that the RIAA looks at units shipped, whereas the Nielson guys rely on "barcode scanned purchases." The results? Well, the second system indicates a 10% rise!
Obviously, record stores aren't interested in stockpiles of goods that clutter up already compact stores. Instead, they make many small orders; it's an "on demand" model that helps the stores compete with the online market.
I know; it's not as if we needed further evidence that the RIAA has been lying and misrepresenting out the wazoo.