Before the age of the digital and mechanical scales, people conducted their business with balance scales, where an exact predetermined weight was placed on one side, and the goods were placed on the other side. So, when a storeowner put a one-pound weight on one side of the scale, and six tomatoes on the other side of scale, if the sides of the scale stood perfectly balanced, then the owner and the customer both knew that they were conducting a transaction over one pound of tomatoes.
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