What’s the reason for eggs to be sold in dozen

Question

What’s the reason for eggs to be sold in dozen

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Answer 1

Additional information: There was a period of time where English speaking countries simultaneously used base-10 and base-12 counting systems. For 10 you use your fingers, for 12 you use your thumb to count the individual segments of the other fingers. We see vestiges of this in the language, too, like eleven and twelve not following the “-teen” convention