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

_Farmers and bakers adopted the practice of selling eggs and bakery items by the dozen as a way to make selling goods at market easier and to avoid making change. According to the New York Times, a farmer could sell one egg for a penny or 12 for a shilling (which equaled 12 pennies)._