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Economist Writing Every Day
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What is in a QR Code? – Economist Writing Every Day
https://economistwritingeveryday.com/2025/09/09/what-is-in-a-qr-code/
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Bar codes have been common in retail stores since the 1970s. These give a one-dimensional read of digital data. The hardware and software to decode a bar code are relatively simple. The QR code enc…
