UPCs are not as universal as they once were. By removing an ounce from a can of soup (Walmart Rollback) or adding an extra hairbrush accessory to a Barbie to ma

UPCs are not as universal as they once were. By removing an ounce from a can of soup (Walmart Rollback) or adding an extra hairbrush accessory to a Barbie to make it a Target Exclusive, the UPCs differ and become more specific to its destination in the supply chain. (It also makes it impossible to price match since the Target doll and Walmart soup are no longer technically the same item competitors sell, even though they practically are). International edition textbooks also have different UPCs (but not ISBN) than the standard versions.