A machine-readable label that shows information encoded into a graphical black-and-white pattern. For cryptocurrencies, it is often used to easily share wallet addresses with others.
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The impact of opportunity cost on personal and professional life
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Understanding the concept of opportunity cost
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Everyone today always has their smartphone, most phones have a decent camera, & that camera is capable of doing more than just opening websites. Most smartphone models now come with a built-in QR scanner on the camera app. For those that don’t, there are 3rd party apps.
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