Are the IDs actually uniquely identifiable? (Score 1)

I don't know if this is relevant or not, but the numbers encoded in a barcode only serve to identify the product. For example every can of Spam has the same barcode on it simply identifying it as a can of Spam. Are they really going to give each tag a unique ID number? I can see the possibility but I would be surprised it they did. In any event, if you started using cash instead of credit cards and checks no one would be able to track your spending habits.