QRcodes (and the wide variety of barcode scanning products) never reached critical mass: - it wasn't worth it for individuals to learn how to use it unless th

QRcodes (and the wide variety of barcode scanning products) never reached critical mass: - it wasn't worth it for individuals to learn how to use it unless there were businesses that had them, - it wasn't worth it for businesses to install them unless individuals knew how to use them. Google might just have broken that barrier by mailing out 150,000 QRcodes.