Where's George ?
If anybody here has ever seen that printed on paper money
they probably know about this site.
https://www.wheresgeorge.comIt's fascinating it tracks the path of particular paper money bills.
It seems to me if barcodes were added to paper money and barcode readers were a built in feature of computerized networked cash registers it would go a long way to help stop counterfitting especially like those virtually Indistinguishable counterfeit superdollars being printed on very high quality government printing presses in Iran and North Korea.
Plus it would generate a treasure trove of real raw data that economists could use to create very good realistic reports of economic activity.